ABO advance study guide: Best for Tests and Exams Prep: Questions and Answers 100% Correct!!
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Course
ABO Advance
Institution
ABO Advance
ABO advance study guide: Best for Tests and Exams Prep: Questions and Answers 100% Correct!!
When taking seg height measurements, which of the following situations could result in a parallax error? - ANS Patient sitting/ dispenser standing erect
Which of the following is not significant in i...
,When taking seg height measurements, which of the following situations could result in
a parallax error? - ANS Patient sitting/ dispenser standing erect
Which of the following is not significant in identifying the problem of vertical imbalance?
- ANS Patient's age
Which of the following elements is NOT critical when determining vertical imbalance? -
ANS Lens power in the 180 degree meridian
A
A prism will displace the object being viewed towards its ________. - ANS Apex
VI
A prism will bend light towards its _______. - ANS Base
When dealing with problems of vertical imbalance which is the critical meridian of total
TU
lens? - ANS 90
Which of the following prescriptions would pose the greatest prismatic imbalance at a
reading depth of 10mm? - ANS OD +2.50
OS -0.25 +2.50 x 090
IS
A plus lens moved downward from the primary position will result in: - ANS Base
down prismatic effect
M
What is a hereditary pigmentary degeneration of the retina called which results in
O
gradual loss of peripheral vision? - ANS Retinitis pigmentosa
What is ocular hypertension? - ANS Elevation of pressure in the eye above the range
A
considered with an detectable changes in vision or damage to the structure of the eye.
N
or
JP
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 ________. - ANS of little concern
Approximately what percentage of humans have some alterations in lens transparency
after age 65? - ANS 60%
,What type of cataract is a fully developed opacity of the lens with fluid generation and
swelling of the lens volume? - ANS Hypermature
Which of the following statements is false regarding cataracts? - ANS Cataracts will
only form in the nucleus of the lens.
________ is the condition in which both eyes have equal refractive power. - ANS
Insometropia
A
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
VI
degree apart. Irregular astigmatism is commonly caused by trauma surgery, or corneal
dystrophy. TRUE or FALSE - ANS True
TU
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 - ANS True
_______ are _____ cells that detect motion within a field. - ANS Rods-Long
IS
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
M
the causes of presbyopia. TRUE or FALSE - ANS False
O
The triangular structure between the choroid and root of the iris, containing the ciliary
epithelium, stroma, and ciliary muscle is the: - ANS Ciliary body
A
There are 5 layers of the cornea. They are: - ANS From most anterior to posterior.
Epithelium-Bowman's Layer- Stroma- Descemet membrane- Endothelium
N
The refractive index of the cornea is: - ANS 1.376
JP
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 ________. - ANS must remain
transparent and must have regular cell structures of all layers.
Polarized filters are made by stretching thin sheets of __________ in one meridian. -
ANS Polyvinyl alcohol
, Visible glare can be dangerous because it can not only wash out colors, but in some
instances, can cause _________. - ANS Photokeratitis
Features and benefits of Trivex include __________. - ANS Superior optics
Impact Resistant
Ultra-lightweight
What is the index of refraction of Trivex? - ANS 1.53
A
What is the index refraction of polycarbonate? - ANS 1.59
VI
What company introduced CR-39 lenses? - ANS PPG industries
__________ are generally inorganic materials (metals or minerals) that are vacuum
TU
deposited to add color on glass lenses to give a uniform density of color on the lenses. -
ANS Vacuum color coating
Glare is of more concern to which wearer? - ANS Cataract patients
IS
_______ is better than ______ for improving contrast? - ANS Green-Gray
_______ added to any color increases contrast. - ANS Yellow
M
Although this may be the most popular color for sun lenses, it is not recommended for
O
patients with emerging cataracts. - ANS Gray
Given a high plus or high minus RX, which lens material would offer the best choice for
A
uniform density in sun lenses? - ANS CR-39 & Trivex
N
A Characteristic of a dark tinted glass lens with an RX of +4.00 SPH would be
_________. - ANS Darker in the center and lighter on the edge
JP
If a person has exposure to sunlight at least 2 hours or more during the day,
__________. - ANS 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 _________. - ANS 15% to
30%
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