ABO Practice Test Questions with 100% Correct Solutions Test Bundle

Corpuscular the theory which explains light as a stream of invisible bundles of energy Photons the visible bundles of energy Electromagnetic Theory The theory which explains light as moving in a series of wave pulsations. 186,000 miles per second the speed of light in air ray...

150 mm - When ordering a six inch temple, its corresponding millimeter value is which of the following? A. 135 mm B. 140 mm C. 145 mm D. 150 mm 500 mm - What is the focal length of a 2 diopter lens? A. 500 cm B. 39.37 inches C. 500 mm D. 2 meters Nanometers - Wavelengths are m...

the wavelength of the infrared waves in the electromagnetic spectrum are - longer than visible red light waves the Geneva Lens Measure is calibrated for a refractive index of - 1.530 A lens made from 2 convex surfaces - has against motion A lens reads +4.25D in the vertometer. If t...

Single Vision - corrects for one distance Multifocal - Corrects with two or more prescriptions (or 'powers') Bifocal - lens having two focus strengths Trifocal - pertaining to having three focus strengths Calculating Prismatic Effects - obtained at the center of an optic...

To mount a lens in a nylon suspension type frame, it would be necessary to _______ the lens. a) Drill b) Notch c) Groove d) V-Bevel - c The optical center of a lens is: a) At the geometrical center b) One the 180 line c) At the point where the "a" and "b" measurement meet d) A ...

When discussing thick lenses, the factors which are considered in computing the lens power are: a. front curve, thickness and index b. back curve, thickness and index c. front curve, back curve and thickness d. front curve, back curve, thickness and index - d. front curve, back curve, thick...

When light is refraction by a prism it is: a. Bent toward the apex b, Bent toward the base c. Not bent d. Reflected - B. Bent toward the base A prism always bends light toward its base. Prisms: I. Always bend light toward the base II. Always bend light toward the apex III. Cause chroma...

Cancelling effect- subtract prism amounts - BU/BU BD/BD BI/BO Powers between 0.00 & +/- 3.00 - Read in 1/8 diopters .12 .37 .62 .87 Lensometer is also referred to as - Lensmeter, focimeter, vertometer To focus eyepiece - 1) while turned off. Place white sheet of paper ag...

Six - The extra-ocular muscles are inserted into the sclera and serve to rotate the eye in all possible directions. There are _____________ muscles in each eye. Sclera and cornea - The fibrous tunic is compromised of the: In the brain - Fusion occurs: The ciliary body - The aque...

A lens reads +2.25 in the lensometer. If the ocular curve is -6.00, what is the anterior curve? A. +2.25 B. +6.25 C. +8.25 D. +10.25 - C. +8.25 Which of the following UV areas is completely absorbed by the atmosphere? A. UVA B. UVB C. UVC D. UVD - C. UVC Which of the following fr...

What controls the amt of light entering the eye - Iris Meniscus, equiconcave and flat concave are types of: - Minus lenses What is the term used to describe the eye's tendency to turn from its normal position? - Phoria What kind of lens has one convex and one concave surface? - ...

Abbe Value - A numerical expression of how prone a lens material is to causing chromatic aberration. The higher the Abbe Value the lower the chance it will cause aberration Aberration - An unclear image of an object when viewed through a lens. ABO - American Board of Opticianary an ag...

Accommodation - Focusing of the eye in a near object theough relaxation of the ciliary muscle and thickening of the lens. Amblyopia - The loss of vision without any apparent disease of the eye. Ametropia - A refractive error in which the eye, when in a state of rest, does not focus th...

Sclera - Tough, white outer coat of the eyeball myopia - nearsightedness; the condition in which parallel rays of light are brought into focus in front of the retina, rather than on it reflection - light that bounces back refraction - when the direction of light changes as it pa...