ABO
Columbia International University
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ABO Exam Prep Part 2 Basic Optic Principles questions and answers
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UV radiation 
Radiation type of wavelengths shorter than 400 nm 
 
 
 
UV C 
Division of UV radiation ranging from 290-200 nm & is extremely dangerous, absorbed by the ozone layer 
 
 
 
UV B 
Division of UV radiation ranging from 320-290 nm & causing sunburn, corneal burn, retinal damage, & eventually cataracts; mainly absorbed by the cornea & partly the crystalline lens 
 
 
 
UV A 
Division of UV radiation ranging 400-320 nm & causing suntan & cataracts; primarily absorbed by the crystalline ...
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ABO EXAM Dispensing Theory and Dispensing Well Designed Lenses questions and answers
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This allows dispensers to avoid being directed to a poor decision by a patient who has no optical experience 
control 
 
 
 
A pair of eyeglasses achieves perfection if it succeeds in these three areas: 
good optics, good wearing comfort, and good cosmetics 
 
 
 
The patient has a great deal of ________ invested in you, and you must be willing to handle each prescription with the full accumulation of our knowledge and skills 
trust 
 
 
 
The purpose of power dispensing is to make patients awar...
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ABO Exam Preparation (Leonardo Program)fully solved
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bulbar conjunctiva 
Vascular, transparent membrane that covers the white sclera. Protects and lubricants the eyeball 
 
 
 
ciliary body 
Responsible for focusing at near objects. Makes the lens take on a thin/thick shape with muscular power to be able to alter the shape of the lens. Connected with the choroid. 
 
 
 
Cornea 
Transparent part of the eye that covers the iris and the pupil. Helps focus the light entering the pupil. Kept moist with a thin layer of tears and polished by eyelid movem...
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OTI and Walman ABO EXAM Prep questions and answers
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Visible Spectrum of light 
390 -750 Nanometers 
 
 
 
Long Ultraviolet (UV) Light 
396-400 Nanometers 
 
 
 
Light is always bent towards the _______ of a Prism 
Base 
 
 
 
1 Inch 
25.4 millimeters 
 
 
 
I meter 
39.37 inches 
 
 
 
Wavelength 
The distance between two corresponding parts of a wave 
 
 
 
two negative numbers when multiplied equal a ____ number 
positive 
 
 
 
Wave Theory 
Christian Huygens late 1600s -describes light as moving in waves, like waves of water 
 
 
 
corpuscular...
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ABO advance study guide with 100% correct answers
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When taking seg height measurements, which of the following situations could result in a parallax error? 
Patient sitting/ dispenser standing erect 
 
 
 
Which of the following is not significant in identifying the problem of vertical imbalance? 
Patient's age 
 
 
 
Which of the following elements is NOT critical when determining vertical imbalance? 
Lens power in the 180 degree meridian 
 
 
 
A prism will displace the object being viewed towards its ________. 
Apex 
 
 
 
A prism will bend ...
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ABO OPTICAL EXAM QUESTIONS AND ANSWERS 2023/24 UPDATE VERIFIED
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Light falling on the front surface of a spectacle lens is: 
A) partially reflected, partially absorbed and the remainder refracted 
B) partially reflected and the remainder refracted 
C) partially absorbed and the remainder refracted 
D) totally refracted 
A) partially reflected, partially absorbed and the remainder refracted 
 
 
 
Concave mirror: 
A) can focus parallel incident rays to form a real image 
B) can focus parallel incident Rays to form a virtual image 
C) always produce inverted im...
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ABO Exam Prep – Anatomy fully solved
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Fibrous Tunic 
Vascular Tunic 
Nervous Tunic 
What three layers are the eye made up of? 
 
 
Fibrous Tunic 
Consists of the sclera and the cornea. 
 
 
Vascular Tunic 
Consists of the iris, the choroid, and the ciliary body and is responsible for nourishment 
 
 
Nervous Tunic 
The inner layer of photoreceptors and neurons which consists of the retina; 
Contains rods and cones 
 
 
Rods 
Lets us see at twilight and in dimly lit rooms; does not discriminate between different colors of light. 
Abo...
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ABO Practical Exam with 100% correct answers
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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 against lens stop. 
2) turn focus ring all the way counter clockwise,and then back clockwise until sharp. 
3) remove paper and turn lensometer on 
4) move power drum to high plus, then turn away from you unti...
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ABO (Practice Test)with complete solutions already graded A+
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To what does a ptosis crutch give support? 
-Upper Lid. 
 
 
 
How is a lens' focal LENGTH altered? 
-Changing the curvature of one surface. 
 
 
 
Which instrument measures vertex distance? 
-Distometer. 
 
 
 
What controls the amount of light that enters the eye? 
-Iris. 
 
 
 
Which word is used to describe light's changing direction as it passes from one medium to another? 
-Refraction. 
 
 
 
Frame materials are available in which two forms? 
-Metal and plastic. 
 
 
 
Meniscus, equiconc...
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ABO Exam 2023/24 study guide with 100% correct answers
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The extra-ocular muscles are inserted into the sclera and serve to rotate the eye in all possible directions. There are _______of these muscles. 
Six 
 
 
 
The fibrous tunic is comprised of the: 
Sclera and cornea 
 
 
 
Fusion occurs: 
In the brain 
 
 
 
The aqueous fluid is continually being manufactured by: 
The ciliary body 
 
 
 
The ability of the eye to bring objects of varying distances to focus on the retina is known as: 
Accommodation 
 
 
 
When accommodation is at rest, rays of lig...
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