ABO Advance Study Guide Questions With Correct Answers
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Course
ABO
Institution
ABO
ABO Advance Study Guide Questions With
Correct Answers
When taking seg height measurements, which of the following situations could result in a
parallax error? - answerPatient sitting/ dispenser standing erect
Which of the following is not significant in identifying the problem of vertical imba...
ABO Advance Study Guide Questions With
Correct Answers
When taking seg height measurements, which of the following situations could result in a
parallax error? - answer✔✔Patient sitting/ dispenser standing erect
Which of the following is not significant in identifying the problem of vertical imbalance? -
answer✔✔Patient's age
Which of the following elements is NOT critical when determining vertical imbalance? -
answer✔✔Lens power in the 180 degree meridian
A prism will displace the object being viewed towards its ________. - answer✔✔Apex
A prism will bend light towards its _______. - answer✔✔Base
When dealing with problems of vertical imbalance which is the critical meridian of total lens? -
answer✔✔90
Which of the following prescriptions would pose the greatest prismatic imbalance at a reading
depth of 10mm? - answer✔✔OD +2.50
OS -0.25 +2.50 x 090
A plus lens moved downward from the primary position will result in: - answer✔✔Base down
prismatic effect
What is a hereditary pigmentary degeneration of the retina called which results in gradual loss of
peripheral vision? - answer✔✔Retinitis pigmentosa
What is ocular hypertension? - answer✔✔Elevation of pressure in the eye above the range
considered with an detectable changes in vision or damage to the structure of the eye.
or
Eye pressure can be elevated and cause damage in some eyes, but no damage in others.
Which of the following statements is false regarding corneal ulcers? Corneal ulcers can be
________. - answer✔✔of little concern
Approximately what percentage of humans have some alterations in lens transparency after age
65? - answer✔✔60%
What type of cataract is a fully developed opacity of the lens with fluid generation and swelling
of the lens volume? - answer✔✔Hypermature
Which of the following statements is false regarding cataracts? - answer✔✔Cataracts will only
form in the nucleus of the lens.
________ is the condition in which both eyes have equal refractive power. -
answer✔✔Insometropia
Irregular astigmatism occurs when the principal meridians are not uniform along a major
meridian and not uniform along a meridian. They are found at some place other than 90 degree
apart. Irregular astigmatism is commonly caused by trauma surgery, or corneal dystrophy. TRUE
or FALSE - answer✔✔True
In poor light, a person sees red light better than blue, which is why the ocular system tends to be
more myopic, i.e. twilight myopia.
TRUE or FALSE - answer✔✔True
_______ are _____ cells that detect motion within a field. - answer✔✔Rods-Long
The crystalline lens is the same size at birth as in an adult, however, it adds cell layers
throughout life, packing them in which makes the crystalline lens harder and is one of the causes
of presbyopia. TRUE or FALSE - answer✔✔False
The triangular structure between the choroid and root of the iris, containing the ciliary
epithelium, stroma, and ciliary muscle is the: - answer✔✔Ciliary body
There are 5 layers of the cornea. They are: - answer✔✔From most anterior to posterior.
Epithelium-Bowman's Layer- Stroma- Descemet membrane- Endothelium
The refractive index of the cornea is: - answer✔✔1.376
The most powerful refracting medium of the eyes optical system is the cornea. There are five
layers of the cornea, each having a unique purpose and cell structure. One of the requirements of
clear vision is that the cornea ________. - answer✔✔must remain transparent and must have
regular cell structures of all layers.
Polarized filters are made by stretching thin sheets of __________ in one meridian. -
answer✔✔Polyvinyl alcohol
Visible glare can be dangerous because it can not only wash out colors, but in some instances,
can cause _________. - answer✔✔Photokeratitis
Features and benefits of Trivex include __________. - answer✔✔Superior optics
Impact Resistant
Ultra-lightweight
What is the index of refraction of Trivex? - answer✔✔1.53
What is the index refraction of polycarbonate? - answer✔✔1.59
What company introduced CR-39 lenses? - answer✔✔PPG industries
__________ are generally inorganic materials (metals or minerals) that are vacuum deposited to
add color on glass lenses to give a uniform density of color on the lenses. - answer✔✔Vacuum
color coating
Glare is of more concern to which wearer? - answer✔✔Cataract patients
_______ is better than ______ for improving contrast? - answer✔✔Green-Gray
_______ added to any color increases contrast. - answer✔✔Yellow
Although this may be the most popular color for sun lenses, it is not recommended for patients
with emerging cataracts. - answer✔✔Gray
Given a high plus or high minus RX, which lens material would offer the best choice for uniform
density in sun lenses? - answer✔✔CR-39 & Trivex
A Characteristic of a dark tinted glass lens with an RX of +4.00 SPH would be _________. -
answer✔✔Darker in the center and lighter on the edge
If a person has exposure to sunlight at least 2 hours or more during the day, __________. -
answer✔✔their ability to adapt to night vision is compromised if they don't protect their eyes
from the sun exposure.
Standard transmission is sun lenses should range between _________. - answer✔✔15% to 30%
The denser the tint in a lens, __________ - answer✔✔the less transmission of light through the
lens.
The absorption of light in lenses is classified by two variables. What are they? - answer✔✔Tint
& lens transmission
Aphakia - answer✔✔An absence of the crystalline lens of the eye (pseudophakia: having a false
lens)
Apex - answer✔✔Thinnest edge of a prism.
Anterior - answer✔✔front cavity or compartment of the eye, located between the cornea and
CHAMBER: crystalline lens contains the aqueous humor.
Anisometropia - answer✔✔Condition in which the refractive error of one eye significantly
differs from that of the other.
OD -1.00 OS -2.25 or OD +1.00 OS +2.25
Aniseikonia - answer✔✔A condition in which the ocular image of an object as seen by one eye
differs so much in size or shape from that seen by the other eye that the two images cannot be
fused into a single impression. Unequal size of retinal images.
Ametropia - answer✔✔A refractive error in which the eye, when in a state of rest, does not focus
the image of an object upon the retina; includes "hyperopia, myopia, & astigmatism.
any error of refraction in which images do not focus properly on the retina
Ambylopia - answer✔✔Loss of vision without any apparent disease of the eye.
Lazy eye causing other eye to lose some portions of visions.
Addition - answer✔✔Difference in plus power between the reading & distance portions of a
multifocal lens.
Acuity - answer✔✔Visual expression of sharpness of vision (20/20 distance j.l near)
Achromatic - answer✔✔Descriptive of a lens capable of refracting light without creating a
rainbow effect.
without color
Currently, the two materials capable of passing the ANSI Z-87 High Impact Test are
polycarbonate and _____. - answer✔✔Trivex
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