Study guide for NCLE testing
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| RX +11.00+1.00x020 VD=12mm K: 46.25/47.25; What's the power of RGP lens fitted on K | show 🗑
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| A -3.50 lens with a BC of 44.50D provides excellent visual acuity. If the CPC were changed to 45.00D what power would be needed | show 🗑
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| show | Precorneal tear film
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| show | Aniridia
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| A contact lens contains 2 curves; one BC and one secondary curve | show 🗑
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| show | Lenticular design
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| A contact lens has a BC of 7.50mm, what would the PPC most likely be? 7.45mm, 42.50D, 7.35mm, 30.00D | show 🗑
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| show | 7.85mm
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| show | 9.3mm
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| show | Front surface toric
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| A gradual lessening of the power of accomodation due to a physiologic change that becomes noticeable about the age of 40 years | show 🗑
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| show | Plus carrier lenticular lens, hyperflange
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| show | A hyperflange
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| show | DK value
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| show | Anisometropia
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| show | Bowman's Layers
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| A lens design generally used in higher plus powers which consists of a central optic zone and a surrounding non-optic peripheral or carrier portion is | show 🗑
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| A lens in which both the posterior surface has two different radii and the anterior surface has two different radii is | show 🗑
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| show | Front surface toric lenses
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| A lens may behave like a tight lens even if the fit is good because | show 🗑
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| A refractive error that prevents light rays from coming to a single focus on the retina because of different degrees of refraction in a various meridians of the eye | show 🗑
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| show | Once per week
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| show | Larger diameter; larger diameter = steeper fit = tighter fit
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| show | Apical clearance
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| A term sometimes used to mean congestion of the ciliary or conjunctiva blood vessels, redness of the eye | show 🗑
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| show | B.U.T. Test (Break-up Time)
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| show | Corneal edema, limbal compression
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| A truncation is used on a rigid gas permeable contact lenses to help enhance the performance of which type of design | show 🗑
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| show | Rubbing off of the superficial layer
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| Abbreviation for an RDP material which combines silicon or oxygen. Transmissibility and mentacrylae for optical quality, lenses machinability and stability | show 🗑
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| Against-the-rule-astigmatism | show 🗑
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| show | BC is too steep or diameter is too large
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| show | Hereditary loss of pigment in the eye, skin and hair, usually associated with lowered visual acuity, nystagmus and light sensitivity
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| show | GPC; giant papillary conjunctivitis
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| Amblyopia (lazy eye) | show 🗑
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| Amblyopia ex anopsia | show 🗑
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| Ametropia | show 🗑
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| An acute infection of the Meibomian glands is called | show 🗑
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| An enzyme contained in the precorneal tear fill that protects the cornea from infections is | show 🗑
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| show | (1/3 rule) -3.50D
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| show | (1/3 rule) -3.00D
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| show | A condition in which the ocular image of an object as seen by one eye differs so much size or shape from that seen by the other eye that the two images cannot be fused into a single impression
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| show | Inequality of the pupils in diameter
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| show | Departure from the normal
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| show | Absence of a true eyeball
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| Anterior Chamber | show 🗑
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| Antibody | show 🗑
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| Antigen | show 🗑
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| Antihistamines | show 🗑
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| Aphakia | show 🗑
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| show | Clear, watery fluid that fills the anterior and posterior chambers within the front part of the eye
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| Arcus Senilis | show 🗑
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| show | An edematous condition of the epithelium of the cornea characterized by irregular reflection from the multitude of droplets when the cornea is viewed with the slit lamp
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| Biconcave Lens | show 🗑
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| show | Lens having a convex surface on both faces
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| Binocular Vision | show 🗑
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| show | Inflammation of the margins of the eyelids
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| show | Excessive relaxation of eyelid skin due to loss of elasticity
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| Blepharoconjunctivitis | show 🗑
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| Blepharoplasty | show 🗑
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| Blepharoptosis | show 🗑
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| Blepharospasm | show 🗑
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| Cataract Operative Procedures | show 🗑
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| Caved in surface curvature; having the power to diverge light rays, denoted by a minus sing | show 🗑
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| Central clearance between the cornea apex and the posterior surface of a contact lens. As a contact lens steepens the sagital depth increases period as a contact lens flattens the sagital depth decreases | show 🗑
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| show | Ability of the eye to perceive in the direct line of vision
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| Chalazion | show 🗑
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| Chemosis | show 🗑
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| show | Congenital cleft due to the failure of the eye to complete growth in the part affected
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| show | Inflammation of the choroid
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| Choroid | show 🗑
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| Ciliary Body | show 🗑
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| Congenital absence of the iris | show 🗑
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| Conjunctiva | show 🗑
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| show | Process of directing the visual axes of the two eyes to a near point, with the result that the pupils of the two eyes are closer together
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| Contact lenses | show 🗑
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| show | Caruncle
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| show | Eyelids
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| show | Clear, transparent portion of the outer coat of the eyeball, forming the covering of the aqueous chamber. The ____ is responsible for the majority of the eye's refractive ability
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| show | Operations to restored vision by replacing a section of opaque cornea
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| Corneal layer separating the stroma from the endothelium | show 🗑
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| show | Stroma
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| Diameter of the base curve is referred to as | show 🗑
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| Dimple veil staining on the cornea is caused by | show 🗑
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| Distortion, the failure of rays to converge at one focus because of limitations or defects in a lens | show 🗑
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| show | Eyelids
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| During a blink the lower eyelid moves primarily towards the | show 🗑
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| Expressed diopters of surface power | show 🗑
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| show | Lashes
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| For every ____D change in power the back curve is different | show 🗑
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| show | 7%
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| Front surface | show 🗑
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| show | Smaller diameter, and flatter base curve
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| show | Make sure the lens is not inside out, needs a larger diameter or steeper base curve
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| How do we FOG the patient | show 🗑
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| show | using a Shadowgraph
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| show | 20 minutes; lens becomes hydrated with patients tears and reaches temp of 98.6
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| show | 5 layers
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| How much light does a handling/visibility tint absorb | show 🗑
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| show | 10-20%
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| show | HEMA
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| Hydrogel lenses with low water content | show 🗑
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| show | Power
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| show | Lashes
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| show | Decrease the optical zone diameter
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| In order to tighten the fit of a rigid gas permeable lens, you can | show 🗑
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| show | Irregular astigmatism
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| show | Steeper
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| show | Blepharitis
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| show | Keratisis
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| show | Belpharitis
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| Innermost tear film layer responsible for adhering the tear film to the anterior surface of the cornea produced by the goblet cells of the conjunctiva | show 🗑
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| Lowers the lid | show 🗑
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| Maintains shape of lids | show 🗑
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| Manufacturers of newer lenses suggest that they move how much | show 🗑
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| Millimeter ruler used to measure the overall diameter of a rigid lens as an alternative to hand magnifier | show 🗑
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| show | 7.90mm
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| Modified cilia | show 🗑
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| show | Eyelids
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| Muscle responsible for the lid closure | show 🗑
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| show | Eyelids
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| Myopes are under or cover corrected with fogging | show 🗑
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| Outermost tear film layer produces by the Melbournian gland in the upper tarsal that prevents or delays tear evaporation | show 🗑
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| Overall diameter, total diameter. The chord length of a lens, measured across the back surface from edge to edge | show 🗑
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| Palbebral | show 🗑
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| People with steep corneas have a smaller or larger HVID | show 🗑
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| show | PMMA
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| show | Corneal hypoxia
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| Preservatives in contact lens solutions can cause | show 🗑
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| Primary colors | show 🗑
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| Process of renewal or restoration in the cornea certain layers regenerate | show 🗑
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| show | Levator palpebral seperioris
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| show | Lashes
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| Severe damage to the corneal endothelium results in what | show 🗑
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| show | Steeper
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| Spectacle lens prescribed at -10.00D, if the lens fit is at a vertex distance of 10mm, an RGP contact lens fit on K will required a power of how much | show 🗑
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| show | Nasal Canthus, medical Canthus, inner Canthus
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| show | B.U.T. Test (Break-up Time)
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| Tears drain into the | show 🗑
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| show | Residual astigmatism
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| The average central thickness of the cornea is | show 🗑
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| show | Central Posterior Curve (CPC)
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| show | 45.00D
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| The CPC of a trial contact lens is 44.00D and contains a power equal to +14.87D. The over refraction is equal to -1.62D. What is the final contact lens RX if the CPC to be ordered is 43.62D | show 🗑
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| The curvature of the central part of the posterior surface of a contact lens. Base curves is expressed in millimeters of radius of curvature or in diopters. Also referred as central posterior curve. | show 🗑
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| show | Base curve (BC)
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| show | Endothelium
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| The diameter of a lens must be large enough | show 🗑
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| The distance between a flat surface and the back surface of the central portion of a lens is called the | show 🗑
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| show | Back vertex power (BVP)
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| The effective power of a lens when measured from the back surface | show 🗑
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| The function of the eyelids are | show 🗑
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| The lipid layer of the precorneal tear film is secreted from the | show 🗑
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| The main disadvantage of soft contact lenses | show 🗑
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| The mass of an aphakic rigid gas permeable contact lens can reduced by making the lens design | show 🗑
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| The measurement from one edge of a contact lens to the opposite edge is the | show 🗑
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| The measurement from one edge of the lens to the opposite edge is | show 🗑
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| The Meibomian glands are located on the | show 🗑
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| show | Levator palpebrae
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| The mucus layer of the precorneal tear film is secreted by the | show 🗑
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| show | Dua's Layer
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| show | Eyelid margin
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Created by:
misz.corcor