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NCLE REW 1
| Question | Answer |
|---|---|
| Which of the following medications may affect successful contact lens wear? A.Antacids B.antihismines C.aspirin D.Laxatives | B.antihismines |
| Which term refers to a sensitivity to light | Photophobia |
| The following is an example of what type of astigmatism K's42.50@180/40.50@90 | Against-the-rule astigmatism |
| The cornea receives nutrients from | Aqueous humor, tears, limbal blood occuli |
| The increased loss of ability of the crystalline lens to accommodate is called | Presbyopia |
| Which instrument can provide simultaneous information about the cornea,lid,conjunctiva,lashes,contact lens surface and fit? | Slit lamp |
| The pre-corneal tear film is composed of three layers.they are: | Lipid, aqueous, mucin |
| Transpose the following Rx into minus cylinder form Rx-4.50+1.25×94 | -3.25-1.25×4 |
| The average pH value of the human tear is | 7.4 |
| If the manufacturer's guidelines suggest a minimum of 4 hours for disinfection, what would you suggest to the patient | A minimum of 4 hours is required |
| The main supply of oxygen to the cornea epithelium is derived from the | Tears film |
| What is the term for the condition in which there is loss of vision without any apparent disease to the eye | Amblyopia |
| Which auxiliary trial lens will extend the keratometer to approximately 30.00D | -1.00D |
| Which step should be performed first when taking keratometer measurements | Focus the eyepiece |
| The following is an example of what type of astigmatism K's44.00@180/44.50@90 Rx-3.00-2.50×180 | Lenticular astigmatism |
| Ocular signs of aging include | Tear film abnormalities, reduced lid elasticity, lens opacities, loss of accommodation |
| Transpose the following Rx into minus cylinder form Rx +1.50+1.00×75 | +2.50-1.00×165 |
| The pre-corneal tear film provides | A smooth optical surface, metabolic nutrients to the epithelium |
| The cornea has five distinct layers. In order from anterior (front) | Epithelium, Bowman's membrane, Stroma, Descemet's membrane, Endothelium |
| The normal cornea is transparent due to the pump action creating proper fluid balance. Which layer of the cornea is most responsible for maintaining this function? | Endothelium |
| A normal tear break up time is | 10-12 |
| A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the elderly is known as | Arcus senilus |
| Patients with keratitis sicca are more prone to | Secondary infections |
| Upon removal of the crystalline lens, the patient is | Aphakic |
| The following Rx represents OD+2.00=20/20 OS-3.00-2.00×180=20/20 A.presbyopia B.anisometropia C.amblyopia D.emmetropia | Anisometropia |
| The above patient will best achieve stereopsis with which of the modalities | Contact lenses |
| Tom's spectacles with a power of -12.00+0.50×90, sit 10 mm in front of his cornea. The likely soft contact lens prescription for Tom would be A.-10.50D B.-11.75D C.-12.00D D.-12.50D | VD= 12×12×12÷1000=1.44(1.50) CP= A.-10.50D |
| The keratometer is an instrument used to measure | Corneal curvature |
| The average life span of a corneal epithelial cell from mitosis through maturation and desquamation most nearly approximates A.one day B.one week C.one month D.one year | B.one week |
| Which auxiliary trial lens extend the keratometer to approximately 61.00D | +1.25 Nota: The range of the keratometer is 36.00D to 52.00D. To extend the range above 52.00D, a +1.25 lens is used |
| Wearing lenses in high altitudes and dry environments may result in complaints of all but the following A. Photophobia B. Chalazion C. Grittiness D. Burning sensation | B. Chalazion |
| Patients with which of the following occupation can successfully wear contact lenses? A. Arc welders B. Firefighters C. Teachers D. All of the above | D. All of the above |
| Transient keratometric mire distortion is usually due to | Pre-ocular tear film |
| In against-the-rule astigmatism, the steeper corneal meridian | Is at or near 180 degrees |
| Irregular mires on a keratometer may be indicative of | Dry eyes or excessive mucoid secretions, keratoconus, contact lens induced corneal warpage |
| In an alignment lid attachment RGP fit, the fluorescein pattern should show | A thin, even layer of fluorescein and less than 180 degrees of bearing in the mid-periphery |
| In an RGP wearer, an arcuate stain on the cornea may be due to | Poorly blended secondary curve |
| In a schimmer 1 test | A patient with an unanesthetized eye and normal tear output should wet al least 15 mm of the filter paper in 5 minutes |
| In a schimmer 2 test | An anesthetic drop is instilled before the schimmer strip is inserted to eliminate the reflex tearing caused by the filter paper |
| Rose Bengal testing | Will stain devitalized conjunctiva epithelial cells brightly |
| When evaluating tear film break-up-time | A break-up-time of less than 10 seconds may preclude success with contact lenses |
| The preservative in contact lens solutions | Is formulated to keep microorganisms from multiplying in a bottle of contact lens solutions after it has been opened |
| Results of a refraction show a patient to see best at distance with a power +1.25+1.00×95, and near with a power of +2.50+1.00×95, What is the "add" power | +1.25 D |
| A pre-presbyopic myopic patient who is still able to read with single vision glasses may find that | They are unable to see fine print when fit with contact lenses |
| Amy's +8.50 D spectacles sit 12 mm from the cornea. The power of a soft contact lens for amy, properly vertexed, would be A.+8.00D B.+8.50D C.+9.50D D.+11.00D | VD=8.5×8.5×12÷1000=0.867 C.+9.50 D |
| Which of the following choices would work best for the patient's visual needs, given the following information K's 44.00@180/45.25@90 Rx-3.00+0.25×90 | Spherical soft lens |
| Which of the following set of lens specifications would best simulate an intrapalpebral RGP fitting given the following infor K's 42.00@180/43.00@90 Rx-2.00-1.00×180 upper lid positions 2mm above the superior limbus A.42.50 -2.50 8.5 B.42.00 -2.00 9.5 | |
| A.42.50 -2.50 8.5 note:An intrapalpebral fit is a mal diameter, steep fitting lens designed to center between the upper and lower eyelid. The other choices are either large diameter or flat fitting lenses | |
| Which contact lenses would best correct this patient's visual needs, given the following information K's46.00@180/45.50@90 Rx-3.00-1.50x90 | A soft toric lens |
| The average HVID for a patient is | 0.9% Nota: HVID stands for horizontal visible iris diameter and is a measurement represented by millimeter(mm) of diameter |
| If a patient has 1.50 of refractive cylinder and keratometer readings of 44@180/44.50@90, you would expect a spherical gas permeable lens to | Result in residual astigmatism |
| Application of fluorescein should be used in which of the following situations | Evaluation of a rigid gas permeable lens fit |
| If the diagnostic rigid gas permeable lens placed on the eye results in minimal movement, which of the following will increase the movement on the lens ordered for the patient | Decreasing overall lens diameter |
| Contact lens technicians work with prescriptions in minus cylinder form because | The lacrimal lens is a minus cylinder lens |
| Rx OU -3.00-0.50×180, add+1.25 D. If spherical soft lenses are being fit using the monovision technique, what is the desired power for the eye fitted for near | -2.00 D |
| Which of the following lens designs would provide the best visual result for this patient K's 43.00@180/ 46.00@90 Rx-3.00 sphere | Soft spherical lens |
| Which edge desing is recommended for a +15.00 D aphakic RGP lens | Lenticular myoflange |
| Which of the following lens designs would provide the best visual result for this patient K's 42.00@180/42.50@90 Rx-3.50-1.75×180 | Soft Toric lens |
| What Rx would be ordered for a rigid gas permeable lens fit "on k" K's 43.00@180/44.00@90 Rx-3.00+1.00×90 | -2.00 D note: when fitting a lens "on K" order the sphere power corrected for vertex distance, when de Rx is minus cylinder:-2.00 |
| To aid in the positioning of a rigid prism ballast lens riding too low and slipping underneath the lower lid, which of the following might be helpful | Truncation |
| The following rigid gas permeable diagnostic lens is placed on a patient's eye: 43.50 -2.00 9.2 An over-refraction is performed with the following results: Plano +1.50×95 which of the following lens parameters would you order for the patient | 43.50 -0.50-1.50×5. 9.2 |
| The following soft lens is placed on a patient's eye:8.8 -4.00 14.0 An over-refraction is performed resulting in-0.75 D sphere. Which of the following lens parameters would you order for the patient | 8.8 -4.00 14.0 |
| In a RGP lens, a poorly finished transitional zone between the optic zone and the lens edge can be evaluated by | Profile analyzer |
| During the diagnostic evaluation of the following patient, the rotates 10 degrees to the right. Which of the following lens parameters would you order for the patient Patient's Refraccion -2.50-1.00×170 Diagnostic lens 8.7 -2.50-1.00×170 | 8.7 -2.50-1.00×160 note: LARS(left+add o right-subtract) |
| Which of the following lens designs would not provide a food vision result for this patient K's 42.50@180/44.00@90 Rx-2.50+1.50×90 | |
| Soft spherical lens | |
| In prescriptions of 4.00 D or greater, fitting contact lenses requires compensating the power for the change in vertex distance. When moving from the spectacle plane to the corneal plane, the compensated power will be | More plus |
| A prism ballast RGP lens requires how much prism for proper orientation | 0.75 to 1.50 D |
| The longer the radius of curvature of contact lens A.the steeper lens B.the flatter lens C.the larger the diameter D.the smaller the diameter | B.The flatter lens |
| Aspheric, McGuire, Soper | |
| The following soft lens is placed on a patient's eye: 8.4 -2.00 14.2 An over-refraction is performed with the following result -1.00-0.50×174 which of the following lens parameters would you order for the patient | 8.4 -3.25 14.2 |
| Given the following informat K's 45.00@180/44.00@90 Rx-3.00+1.00×180 Upper lid positioned at the superior limbus. Which of the following set of lens specifications would best simulate an intrapalpebral rigid lens fit A.44.50 -2.00 8.5 B. 44.50 -2.50 8.5 | B. 44.50 -2.50 8.5 |
| Given the following infor, which of the following set of lens specifications would best simulate a lid attachment rigid lens fitting K' 42.00@180/43.00@90 Rx-2.00-0.87×180 Upper lid positioned 2mm below the superior limbus A.41.50 -1.50 9.5 B.43 -2.50 9.5 | A. 41.50 - 1.50 9.5 |
| Which of the following bifocal designs represents a translating design | Crescent design |
| Given the following information, which of the listed rigid lens designs would you order to best correct this wearer's vision A. 42.00/45.00 -3.00-2.25(Rx form) B. 42.00 -3.00-2.75×177 prism ballast C.42.00 -3.00 D.45.00 -3.00 | A. 42.00/45.00 -3.00-2.25(Rx form) |
| Up until the recent introduction of silicone Hydrogel lenses the Dk/t previous Hydrogel lenses was limited by | Water content and center thickness |
| Given the following information, which of the following GP lens designs will best correct this wearer's vision K's42.50@180/42.50@90 Rx-2.00-4.25×90 A.45.00 -2.00 B.42.00-2.00×90prism ballasted C. 42.00/45.00-2.00/-5.75( drum reading) | C.42.00/45.00-2.00/-5.75(drum reading) |
| Given the following information, which of the following GP lens designs will best correct this wearer's vision A.bitoric design B.anterior toric design c. Spherical design | B. Anterior Toric design |
| Given the following refraction and K reading, select the correct base curve and power recordings(drum reading) K's44.00@180/41.00@90 Rx-1.00-3.00×90 A.41.00/44.00-1.00/-3.00 B.41.00/44.00-1.00/-4.00 C.41.00/44.00-4.00/-1.00 D.44.00/41.00-1.00/-3.00 | B.41.00/44.00-1.00/-4.00 note: a Toric rigid lens should always be recorded with the flat meridian first and the steeper meridian second. |
| Fitting soft lenses steeper than K will usually result in A.good lens movement B.a minus tear layer under the lens C.fluctuations in vision following the blink D.good apical contact | Fluctuations in vision following the blink |
| A bifocal lens in which the power gradually changes from the central area of the lens to a periphery is known as | An aspheric lens |
| How many diopters of power will bring parallel rays of incident light to a focus at a distance of one meter | One diopter |
| The patient has a horizontal visible iris diameter (HVID) of 12.5 mm. The best choice for initial soft lens diameter would be | 14.5 mm |
| In which of the following types of corneal astigmatism is a GP lens most indicated A.irregular B.with-the-rule C.against-the-rule D.oblique | A. Irregular |
| Spherical equivalent powers position which of the following on the retina | Circle of least confusion |
| Keratoconus and penetrating keratoplasty fitting are best accomplished by which of the following methods | Diagnostic fitting |
| The following ametropia frequently results in high riding lenses A.high myopia B.high hyperopia C.aphakia D.presbyopia | A. High myopia |
| A good example of a bifocal contact lens that may rotate without vision impairment is A.aspheric B.executive C.fused crescent D.translating | A. Aspheric nota:aspheric are the only do no have independent near and distant zone |
| A Toric soft lens will correct | Residual astigmatism, moderate astigmatism ( greater than 2.00D), low astigmatism (0.75 the 2.00 D) |
| In calculating the prescription for a rigid lens, one must | Firt transpose the patient's prescription into minus cylinder form |
| Therapeutic soft lenses should be fit with minimal movement in which case | Recurrent erosion |
| A rigid lens corrects astigmatism by: | Forming a new spherical refracting surface in front of the cornea |
| Which of the following is a translating bifocal lens design | Segmented |
| Prism ballast, double slab-off and peri-ballast are all what type of lens design | Soft Toric |
| Which of the following are two methods of stabilizing the rotation of rigid bifocal contact lenses | Truncation and prism ballast |
| K's 42.0@170/43.00@80 Rx-3.00-1.00×170 Given the Rx and K's the following diagnostic Toric soft lens was used: During the diagnostic Evaluation the observer notes the lens rotated 10 degrees clockwise. The lens ordered should have an axis of | 180 degrees |
| The FDA classification for "disposable lenses" means | The lenses is disposed of after removal |
| Given following information K's 42.00@180/42.00@90 Rx-3.00-2.00×180 A.A back surface Toric GP lens will probably be necessary to achieve optimum VA B.A front surface toric GP lens will probably be necessary to correct the patient's residual astigmatism | B.A front surface toric GP lens will probably be necessary to correct the patient's residual astigmatism |
| A patient's K reading are 43.50@180/41.50@90. A spherical GP lens can be expected to | Displaced down and in, or down and out with each blink |
| Which special GP lens design would be beneficial for this patient given the following information? K's 44.00@180/46.50@90 Rx-11.00+2.50×90 | Hyperflange |
| During the diagnostic evaluation of the following patient you note the lens rotates 10 degrees to your left. Which of the following lens parameters would you order for the patient patient's refraction-.00-1.25×160 Diagnostic lens 8.4 -3.00-1.25×180 14.5 | 8.4 -3.00-1.25 × 170 14.5 |
| A patient is diagnostically fit with a GP lens with the following parameters: 42.50-3.00 9.5. If you wish to flatten the lens to cornea relationship, which of the following lenses would you order A.42.00-2.50 10.0 B. 42.50-3.00 9.0 C. 43.00-3.50 9.5 | B. 42.00-3.00 9.0 |
| When are soft lenses contraindicated | When the patient has irregular corneal astigmatism |
| The tolerance for the overall lens diameter according to the ANSI standards is | B. +/-0.05 mm |
| All of the following will enable the practitioner to verify the overall GP lens diameter | Slot gauge, shadowgraph, measuring magnifier |
| Placing the concave side of a gas permeable lens against the lens stop of the lensometer will provide you with which of the following A.back vertex power B.front vertex power | A. Back vertex power |
| An instrument that allows simultaneous verification of lens diameter, optic zone width and peripheral curve width is | Measuring magnifier |
| When using the thickness gauge on a rigid contact lens, the gauge measures 0.73 mm this lens is most likely which type of lens | High plus power |
| The instrument used for magnification of the edge of a rigid contact lens is a | Shadowgraph |
| The tolerance for a rigid lens power under +/-5.00 D is | Under +/-5.00 D is +/-0.120 note:+/-0.180 for lenses between 5.12 and 10.00 D |
| A warped lens will show ________ base curve(s) on the radiuscope and a ________ power on the lensometer | Two/ spherical |
| How does the front vertex power of high plus lens compare to the back vertex power A. Less plus B. More plus C. Same | A. Less plus |
| Prolonged periods of reading in contact lenses may lead to lens discomfort due to: | Decreased blinking |
| Which of the following statements is most accurate | New soft lens fits should be seen one week, one month, three months and 6 months from the time of their initial fit, then every 6 to 6 months |
| When using the LARS principle for lens rotation correction and comparing the degrees to clock minutes, a Toric lens that rotates exactly half-way between 5 o'clock and 6o'clock must be compensated for by an adjustment of | 15 degrees note:there are 60 minutes in a clock and 360 degrees in a circle. Therefore between 5o'clock and 6 o'clock there are 30 degrees. Half of 30=15 |
| Which type of lens would best satisfy this patient's visual needs given the following information K's 43.00@160/44.00@75 3+distortion RX-2.00+1.00×75 | Spherical GP lens |
| A rigid contact lens measures +15.00 D BVP. The FVP will measure | A lesser dioptric reading note: the power of a high plus lens will always measure a larger numerical value to back vertex power(BVP) when compared to reading in front vertex power(FVP) |
| The LARS principle provides us with a means of | Compensating for axis rotation of a soft lens |
| Patients who are fit with lenses that will be worn overnight on a flexible or extender wear basis | Should be seen as early as possible in the morning for following-up of overnight wear |
| The base curve of a rigid lens was ordered 7.84mm and was received measuring 7.94 mm. This lens is _______ than ordered A. 0.50 D steeper B. 0.50 D flatter | C. 0.50 D flatter note: every 0.5 mm of radius equals approximately 0.25D |
| To steepen the lens to cornea relation-ship of a gas permeable lens you could | Increase overall diameter and increase optic zone diameter |
| Given the following information K's 42.50@180/44.50@90 Rx-3.50-2.50×90. Select the lens power if the lens is ordered and half diopter steeper tha k. A.-3.50 D B. -4.00D | B. -4.00 D |
| Jill is wearing a rigid lens with the base curve of 44.00 D a power of +3.00 D sphere. She requires and over-refraction of -0.50 D and the lens needs to be steepened by 0.50 D. What parameters should be ordered for the new lens | 44.50 +2.00 |
| Corneal edema, a sensation of soreness, injection, foggy vision and ghost images usually indicate A. A tight fitting lens B. Excessive lens movement | A. A tight fitting lens |
| Carole's GP contact lenses are fit on flat K. Her refraction is -5.00+2.00×90. What is the power of her contact lenses? A.-3.00 D B. -5.00 D | A.-3.00 D |
| When verifying a rigid lens on a radiuscope, you notice that the mires are not in focus in all principal meridians. This might indicate a | Warped lens, back Toric lens, bi-toric lens |
| During a follow-up exam, a patient wearing soft lenses, reports that their vision is clearer immediately after the blink and then blurs. The most likely cause is A. A flat fitting lens B. A steep fitting lens | |
| B. A steep fitting lens | |
| The best technique to evaluate the movement of a thin Hydrogel lens is | Push up test |
| Which of the following hobbies and activities should be discussed with parents | Long periods of computer work, long periods of reading, long periods of driving, |
| What is the definition of "disinfection" as it relates to the care of contact lenses | A procedure that reduces the level of microbial contamination on lens surfaces |
| The measuring magnifier may be used to measure which of the following GP parameters | Posterior optic zone diameter and overall diameter |
| What does it mean when we say the soft lens must equibrate on the eye | |
| The polymer of the lens must reach the same temperature as the tear film | |
| If a soft contact lens becomes adherent to the cornea, the patient should | Irrigate the eye with saline or rewetting drops until the lens begins to move freely again |
| Poor GP insertion or recentering technique may result in | Arcuate staining |
| What is an essential characteristic of an ideal wetting solution | They should be formulated so that they can be formulated so that they can be installed directly into the eye without causing irritation or sensation |
| Which soft lens care system is most effective in the removal of deposits | |
| Hydrogen peróxido sytstems | |
| Which of the following preservatives produces the least toxic response of the eye | Polyquad |
| Which of the following statements about eye make-up is correct | Eyeliner and mascara should be replaced every 3 to 6 months to avoid contamination |
| If a soft contact lens is not properly neutralized, how does residual hydrogen peroxide affect the cornea | It is likely to cause epithelial damage |
| When handling contact lenses, what should patients be instructed to do to keep them from becoming deposited with materials from the patient's environment | Handling spicy foods such as garlic, hot peppers and onions should be avoided before handling contact lenses |
| What are the requirements of a good contact lens case | It should allow for total immersion of a lens |
| Which of the following cold disinfection chemicals is least likely to cause a reaction when the product is used according to directions | Hydrogen peroxide |
| If 3% generic hydrogen peroxide is substituted for the solution in one of the FDA-approved hydrogen peroxide care systems | The solution may discolor the lens |
| Use of a Wratten #12 or Tiffen yellow filter in important in evaluating the fluorescein pattern of patients with GP lenses because | Many patients are wearing lenses containing UV inhibitors that block fluorescein |
| The main purpose of a rigid lens wetting solution is to | Convert the hydrophobic surface of a rigid lens to one that is temporarily hydrophilic |
| Newly fitted Extended wear patients should have their first recheck in | 24 hours |
| If an adapted contact lens wearer complains of a sudden onset of discomfort, the technician should suspect | A damage contact lens |
| If a GP lens fails to provide acceptable visual acuity, the fitter should first | |
| Have a sphero-cylindrical over-refraction performed to see if the reduce acuity is due to residual astigmatism | |
| Cleaners that contain isopropyl alcohol should not be used on rigid lenses because they | May cause parameters change, brittleness |
| Three and nine o'clock staining in GP lens wearers can best be eliminated by | Reducing center and edge thickness and teaching the patient to blink completely |
| The slot gauge is used to measure | The diameter of a rigid lens |
| A technician can perform a preliminary evaluation of soft contact lens movement by | Observing the movement of the lens edge in relation to the position of a conjunctival vessel, having the patient look up and blink,, observing movement and lens lag in upward and lateral gaze with a penlight |
| Which of the follow statements concerning lens movements is not correct A.A tight lens may cause blanching of limbal vessel B.A loose len may blurred vision immediately following the blink C.A loose len will be considerably more comfortable than a tight l | A loose lens will be considerably more comfortable than a tight lens |
| Which of the following modifications to a gas permeable lens can not be made in the office A. Blending of peripheral curves B. Addition of minus lens power C. Polishing lens surface D. Changing the base curve | D. Changing the base curve |
| In-office polishing of the anterior surface of a gas permeable len surface will provide many benefit to the patient. Which of the follow is not a benefit of polishing the len in the office A.Cleaner len surface B.Increased lens comfort C.Thinner lens edge | C. Thinner lens edge |
| Punctal occlusion may be most beneficial for which of the following conditions | Tear deficient dry eye |
| If a patient with exophthalmic eyes due to thyroid disease requires a Toric lens | It may dehydrate excessively due to lid retraction and dry eye condition that often accompanies thyroid disease, stability will be difficult to maintain since there are no lid forces to keep the lens in position |
| Which of the following is not characteristic of corneal edema A. Smoky visio B. Spectacle blur C. Increase in K reading D. Peripheral flare | D. Peripheral flare |
| Which of the following is not used when blending peripheral curves in the office A. Slot gauge B. Radius tools C. Polishing compound D. Suction cups or a spinner tools | A. Stot gauge |
| The slit lamp illumination that gives an overall view of the cornea but limits detail is | Diffuse |
| When keratometric mires reflected off a soft contact lens are only clear when the wearer blinks, the lens fit is too | Steeper |
| Gross corneal edema, which manifests itself clinically as central corneal haze, is verified by the slip lamp using sclerotic scatter illumination. What specific technique does the examiner use to see this condition | The naked eye and angle between the slit lamp beam and the eye of 90 degrees |
| When inspecting the blend on the bevel of a GP lens with a fluorescent tube | An ideal blend should show a J-shaped or ski pattern in a smooth curve |
| Diffuse central punctate staining is an indication of | Tight lens |
| Sandy returns to your office after being fit with soft contact lenses. She has complaints of the lenses becoming uncomfortable and burning as the day progresses. What might be the reason | The lens is too tight |
| With a rigid contact lens in place, a fluorescein inferioly and superiorly beneath the lens. Which one of the following types of astigmatism is represented by this pattern | With-the-rule astigmatism |
| Mary is wearing a GP lens with a base curve of 43.50 D and a power of a +2.75 D. She required a -0.75 D sphere over this lens. If you wish to order her a new with a curve of 43.00 D, what will the new power be | +2.50 D |
| FDA group I soft lenses | Have a water content less than 50% and non-surface |
| Which type of sitl lamp will allow you to determine corneal thickening, thinning and distortion and depth of foreign bodies or opacities in the cornea | Optic section |
| Corneal edema is observed inferioly under a prism ballast Toric soft lens. Ehat is the probable cause | Prims thickness is too great |
| A soft lens has edge lift when observed on a cornea. How can this be correct | Steepen the base curve |
| In evaluating a soft lens with either kerotometry mires or retinoscopic reflex, you detect distortion immediately after the blink followed by clear mires. This caused by | A flat fitting lens |
| Corneal microcysts are most apparent via biomicroscopy with method of illumination | Retro |
| Which type of slit lamp illumination is used for observing tear break up time | Diffuse illumination |
| A non-wetting gas permeable lens may cause | Hazy, filmy vision, lens awareness, dryness or grittiness |
| Causes of lens flexure may include. | Pressure exerted by the upper lid, high DK lens material, apical clearance lens design, against-the-rule corneal toxicity |
| When evaluating fluorescein pattern, a special filter must be used with | Polymers with a UV blocker |
| The wratten filter is used with the biomicroscopy to | Enhance fluorescein Evaluation |
| Which of the following could cause a patient's rigid contact lens to displace frequently and pop out without cause | Excessive posterior peripheral curve, flat base curve relationship |
| A rigid lens shows two curves on the convex surface when measured with the radiuscope. On the lensometer, it shows on power. What type of lens is this | Warped |
| A soft contact lens that is too loose may show all of the following EXCEPT A. Edge stand-off B. Limbal compression C. Excessive lens movement D. Distorted retinoscopy directly after blinking | B. Limbal compression |
| A patient with a high degree of with-the-rule astigmatism fitted with a spherical gas permeable lens will show to touch | On the horizontal meridian |
| A rigid lens showing apical touch is an indication of | A flat fit |
| A rigid lens showing excessive apical pooling is an indication | A steep fit |
| Contact lenses that have a non-spherical back surface are called | |
| Aspheric lenses | |
| A rigid lens showing central vaulting is indicative of | Apical clearance fit |
| A rigid lens showing a band-shaped area of touch on the flattest meridian is an indication of a lens fit on a(n) | Astigmatic cornea |
| When there is a slight pooling of fluorescein the peripheral curve portion of a rigid lens, it indicates | Slight edge lift |
| Refer to question 93. Once the correctly ordered lens has been dispensed, the rotational Mark's should settle at | 10 degrees clockwise |
| On a compromised cornea, such as one that has undergone a corneal graft, what lens characteristic would be most beneficial | High Dk/t |
| What two design changes might be helpful in centering a high riding myopic lens | Hyperflange lenticular, prism ballast |
| Gas permeable lens flexure may be eliminated by | Reducing sagittal vaulting, increasing center thickness, choosing a lower Dk material |
| Fluorescein is used to observe all of the following except A. Contact lens fit B. Corneal striae C. Corneal dry spots D. Punctate staining | B. Corneal striae |
| Mike, a welder whose RX is -6.00+2.00×180, has been advised to trade his PMMA lenses of 20 years for a modality that allows more oxygen to the cornea. The first lens of choice would be | Low to mid Dk GP |
| When corneal epithelial cells suffer trauma, the fist step toward resolution is | Sliding and migrating of the adjacent remaining epithelial cells |
| Which of the following should be suspected when there are large fluctuations in a patient's refractive error | Diabetes |
| To increase tear exchange with a GP lens, all of the following should be attempted EXCEPT A.reduce the overall lens diameter B.flatten the peripheral curves C.increase the sagittal depth D.decrease the optic zone | C. Increase the sagittal depth |
| Dry eye are a common side effect of | Oral contraceptives, accutane and antihistamines |
| In order to create a smooth blend between the intermediate and peripheral curve of the following contact, which radius tool should be used CPC7.50 mm(45.00 D), IPC 8.5 mm, PPC 10.50 mm | 9.5 mm |
| To correct a flat fitting gas permeable lens you could | Enlarge the optical zone sees |
| Inferior punctate staining may be a sign of | Lagophthalmos |
| Which of the following will not increase the movement of a tight fitting GP lens | Enlarge the posterior optic zone |
| Which of the following is not important to document in medical records for contact lens patients | Location at which the patient was originally taught insertion and removal |
| End | End |
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