Contacts Test 4
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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| Light refracts first through the contact lens and then through the ____________? | lacrimal lens
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| How is the lacrimal lens formed? | The tears collected between the back of the CL and the front of the eye.
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| The spectacle Rx is a combination of the....? | Contact lens power + lacrimal lens power
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| What is the lacrimal lens equal to...? | The difference between the Ks
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| What is the first thing to do when finding the power? | Put the spectacle Rx in minus cylinder form
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| When do you compensate for vertex distance in contact fitting? | When the prescription is 4.00 D or greater
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| What does SAM stand for? | Steeper Adds Minus
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| What does FAP stand for? | Flatter Add Plus
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| What is the first thing you do to find the base curve? | Determine the flat K
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| What are the three different ways to fit contacts? | On K, steeper than K (STK), flatter than K (FTK)
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| When fitting flatter or steeper than K what power is corrected? | Only the sphere power
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| When fitting flatter or steeper than K, you are accommodating for the _____, and the effective sphere power....? | accommodating for the tears; effective spherical power stays the same
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| What is residual astigmatism? | difference between the refracted astigmatism and corneal astigmatism
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| What causes residual astigmatism? | internal or lenticular astigmatism
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| How is residual astigmatism found? | refracted astigmatism - corneal astigmatism = residual astigmatism
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| Anytime corneal astigmatism is greater, the residual will be a plus or minus? | plus
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| For every 0.25D change in K's the radius of curvature changes approximately ____ mm? | 0.05
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| For every 0.50D change in K's the radius of curvature changes approximately ___ mm? | 0.10
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| How are rigid lenses packaged? | dry in a flat pack
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| How are the lenses cleaned? | with 2-4 drops of Boston cleaner; using pinky rub from center to the outer edge (not in circles) flip over, clean the other side; hold lens and rinse with saline or water; pat dry
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| If lenses are being dispensed to the patient they are stored in...? | Boston conditioning
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| What is verified and inspected on the rigid lenses? | Base curve; power; diameter; POZ width; PPC width; bifocal seg height; center thickness; blends; edge contour; surface quality
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| What is used to verify base curve? | radiuscope; radius gauge; microspherometer; contactoguage; attachment to keratometer (con-ta-check)
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| What are two other names for the base curve? | radius of curvature; central posterior curve
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| What is used to measure the power of the lens? | Lensometer (vertometer; focimeter; lensmeter)
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| What is BVP? | Back vertex power
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| What is FVP? | front vertex power
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| When measuring BVP, what side of the lens is towards the lens stop? | concave side
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| When measuring FVP, what side of the lens is towards the lens stop? | convex side
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| Which side will measure more plus, BVP or FVP? | BVP
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| What is used to measure diameter? | diameter gauge (slot gauge, v-groove); measuring magnifier (monocular magnifier, measuring loupe); shadowgraph (projection magnifier)
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| What is used to measure the posterior optical zone width? | measuring magnifier and shadowgraph
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| What is used to measure the posterior peripheral curve width? | measuring magnifier and shadowgraph; if you have a light blend you can measure PPC and PIC; if you have med or heavy blend, you won't be able to tell the difference
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| What is used to measure the bifocal seg height? | measuring magnifier and shadowgraph
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| Where is the seg height measured? | from the truncated part of the lens to the top of the seg
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| What is the center thickness measured with? | Thickness gauge (dial gauge); attachment to the radiuscope
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| What is used to inspect and analyze the blends? | profile analyzer and fluorescent light (fluorescent tube).
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| What are you looking for when inspecting the blends? | The reflection of light on the lens to make a J or ski-edge
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| When using the fluorescent light to inspect the blends the light must be where in relation to the examiner? | in front of and higher than the examiner
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| What is used to check the edge contour and finish? | measuring magnifier; shadowgraph; lens on finger using slit lamp
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| What are you looking for when checking edge contour? | Edge shouldn't be too thick or too thin, and should be smooth and clear
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| What is used to check the surface quality of the lens? | Measuring magnifier; shadowgraph; slit lamp
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| What are you looking for when checking the surface quality? | nice clear lens with no lathe marks or scratches
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| What does an orange peel effect mean when inspecting surface quality? | The lens was not polished enough
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| What does a black dot on a lens mean? | Right eye
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| What is fenestration? | a hole (or many holes) in the lens to get more oxygen
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| What does ANSI stand for? | American National Standards Institute
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| What is ANSI? | A non-governmental, national organization that has standards that are recommendations not requirements
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| The ANSI standards are a guideline, and your standards can be ________? | stricter
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| If you don't receive what is ordered what should you do? | Send it back
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| What order should you use when verifying and ordering lenses? | Base Curve; Power; Diameter; OZ, CT
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| ANSI standards for Base Curve? | +(-)0.05
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| ANSI standards for power 0.00 to 5.00 D | +(-)0.12
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| ANSI standards for power 5.12 to 10.00 D | +(-)0.18
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| ANSI standards for power 10.12 to 15.00 D | +(-)0.25
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| ANSI standards for power 15.12 to 20.00 D | +(-)0.37
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| ANSI standards for power over 20.00 D | +(-)0.50
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| ANSI standards for Diameter | +(-)0.05
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| ANSI standards for Posterior Optical Zone | +(-)0.10
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| ANSI standards for Center Thickness | +(-)0.02
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Created by:
griffiskr
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