ABO advance study guide exam questions & 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 imbalan...
ABO advance study guide exam
questions & 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.
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)
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