Q&A Chapter 3 Lens Form & Analysis
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| The shorter the radius the _______ the curve and the stronger the diopter power is. | steeper
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| The larger the sphere the _______ the curve. | flatter
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| The smaller the sphere the _______ the curve. | steeper
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| A lens that is both concave and convex is known as a ________ lens | meniscus
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| A concave lens is known as a _____ lens | minus
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| A convex lens is known as a ____ lens | plus
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| What is another name for a bi-concave lens? | Myodisc
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| Distortions inherent in any lens with power are known as... | Aberrations
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| 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
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| The Lens Clock is calibrated for what index of refraction? (the number not the name) | 1.53
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| True or False: The Lens Clock can check for slab off. | True
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| True or False: The Lens Clock can determine what the lens material is made out of. | False
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| What is the "standard" index of refraction in the optical industry? | 1.53
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| The cylinder is used for the correction of ___________ and can be used by itself or it can be combined with a sphere. | astigmatism
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| 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
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| 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
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| 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
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| 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
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| 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
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| What does RVD stand for? | Refracted Vertex Distance
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| What does FVD stand for? | Fitted Vertex Distance
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| True or False: A distometer can accurately measure vertex distance. | True
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| True or False: A distometer can measure lens thickness. | False
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| Vertex distance compensation is mandatory for a spectacle prescription of ______ diopters or greater. | +/- 7.00
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| What is the Base Curve for the power ranges of Plano to +2.00 | +6.00
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| What is the Base Curve for the power ranges of -2.00 to -4.50 | +4.00
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| What is the Base Curve for the power ranges of +5.50 to +8.75 | +10.00
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| In modern medical ophthalmic lenses, ocular curves are always ______ or ________ | minus concave
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| A smaller sphere will have ____ power. | more
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| A larger sphere will have ____ power. | less
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| A flatter base curve will make objects appear _______ than before. | smaller
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| An increase in plus power in the base curve makes objects appear ______ than before. | larger
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| Higher index materials create lenses with natural _______ base curves. | flatter
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