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ABO (NOCE) Practice

Q&A Chapter 3 Lens Form & Analysis

QuestionAnswer
The shorter the radius the _______ the curve and the stronger the diopter power is. steeper
The larger the sphere the _______ the curve. flatter
The smaller the sphere the _______ the curve. steeper
A lens that is both concave and convex is known as a ________ lens meniscus
A concave lens is known as a _____ lens minus
A convex lens is known as a ____ lens plus
What is another name for a bi-concave lens? Myodisc
Distortions inherent in any lens with power are known as... Aberrations
What optical tool is used to measure the curvature of a lens and is considered one of the most useful but underrated tools in the optical industry. The Lens Clock
The Lens Clock is calibrated for what index of refraction? (the number not the name) 1.53
True or False: The Lens Clock can check for slab off. True
True or False: The Lens Clock can determine what the lens material is made out of. False
What is the "standard" index of refraction in the optical industry? 1.53
The cylinder is used for the correction of ___________ and can be used by itself or it can be combined with a sphere. astigmatism
What is the name of the term for when the distance of the ocular or back surface of a lens is away from the patient's cornea? Vertex Distance
A +10.00 lens has moved away from a patient's eyes by 5mm. What is the power of the lens for the patient now? +10.50
A -10.00 lens has been moved closer to a patient's eyes by 5mm. What is the power of the lens for the patient now? -10.50
A +10.00 lens has moved closer to a patient's eyes by 5mm. What is the power of the lens for the patient now? +9.50
A -10.00 lens has been moved away from a patient's eyes by 5mm. What is the power of the lens for the patient now? -9.50
What does RVD stand for? Refracted Vertex Distance
What does FVD stand for? Fitted Vertex Distance
True or False: A distometer can accurately measure vertex distance. True
True or False: A distometer can measure lens thickness. False
Vertex distance compensation is mandatory for a spectacle prescription of ______ diopters or greater. +/- 7.00
What is the Base Curve for the power ranges of Plano to +2.00 +6.00
What is the Base Curve for the power ranges of -2.00 to -4.50 +4.00
What is the Base Curve for the power ranges of +5.50 to +8.75 +10.00
In modern medical ophthalmic lenses, ocular curves are always ______ or ________ minus concave
A smaller sphere will have ____ power. more
A larger sphere will have ____ power. less
A flatter base curve will make objects appear _______ than before. smaller
An increase in plus power in the base curve makes objects appear ______ than before. larger
Higher index materials create lenses with natural _______ base curves. flatter
Created by: burukkusu