QUESTIONS WITH SOLUTIONS GRADED A+
◉ The absorption of light in lenses is classified by two variables. What
are they?
A. Base curve and thickness
B. Index of refraction and thickness
C. Thickness and lens transmission
D. Tint, and lens transmission. Answer: C. Thickness and len
transmission
◉ The denser the tint in a lens____
A. The greater transmission of light through the lens
B. The greater internal reflections in the lens
C. The less transmission of light through the lens
D. The fewer internal reflections in the lens. Answer: C the less
transmission of light through the lens
◉ The standard transmissions in sun lenses should range between?
A. 10% and 30%
B. 15% and 30%
,C. 10% and 25%
D. 15% and 25%. Answer: B. 15 and 30%
◉ If a person has exposure to sunlight at least 2 hrs or more during the
day,
A. Their tolerance of bright sunlight is increased
B. Their tolerance of bright sunlight is decreased
C. Their ability to adapt to quick lighting changes is increased
D. Their ability to adapt to night vision is compromised if they don't
protect their eyes from sun exposure.. Answer: D.
◉ A characteristic of a dark tinted glass lens with an RX of +4.00 sphere
would be?
A. Uniform density in color
B. Dark on the edge and lighter in the center
C. Dark in the center and lighter on the edge
D. Waves in the tint. Answer: C. Dark in the center and lighter on the
edge
◉ Given a high plus or high minus rx, which lens material would offer
the best choice for uniform density in a sun lens
A. Pigmented glass
B. Cr-39
,C trivex
D b&c. Answer: D. B&C
◉ Although this may be the most popular color for sun lenses it is not
recommended for patients with emerging cataracts. Answer: Grey
◉ _______ added to any color increases contrast. Answer: Yellow
◉ ______ is better than ____ for improving contrast
A. Violet/gray
B. Green/gray
C. Gray/green
D. Gray/ violet. Answer: B. Green/gray
◉ Glare is of more concern to which wearer?
A. Red haired patient
B. Computer user
C. Cataract patient
D. Presbyope. Answer: C. Cataract patient
◉ ________ 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
, A.vacuum color coatings
B. Deposit color coatings
C. Heavy color coatings
D. AR color coatings. Answer: A vacuum color coatings
◉ What company introduced CR-39 lenses. Answer: PPG Industries
◉ Abduction. Answer: Eye moves temporally
◉ Adduction. Answer: Eye moves nasally
◉ Depression. Answer: Eye moves down
◉ Intorsion. Answer: top of cornea rotates towards nose
◉ Extorsion. Answer: top of cornea rotates away from the nose
◉ convergence. Answer: Both eyes move nasally at the same time
◉ Divergence. Answer: Both eyes move temporally at the same time
◉ What is better to correct refractive aniseikonia and why?