ABO advanced Key Selected Questions and Correct Answers 2024

The amount of reflection of each surface of CR-39 lenses is approximately - 4% 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 - D. tint and lens transmission The denser the tint in a lens A. the greater the 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 - C. the less transmission of light through the lens Standard transmissions in sunlenses should range between - 15% and 30% If a person has exposure to sunlight at least 2 hours or more during the day, - their ability to adapt to night vision is compromised if they don't protect their eyes from the sun exposure A characteristic of dark tinted glass lens with an Rx of +4.00D sphere would be - 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 sunlens? A. Pigmented glass B. CR-39 C. Trivex D. B & C - D. B & C Although this may be the most popular color for sunlenses, it is not recommended for patients with emerging cataracts - Gray _ added to any color increases contrast - Yellow _ is better than _ for improving contrast. A. Violet/Gray B. Green/Gray C. Gray/Green D. Gray/Violet - B. Green/Gray Glare is of more concern to which wearer? A. Red haired patient B. Computer user C. Cataract patient D. Presbyope - 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 - Vacuum color coatings What company introduced CR-39 lenses? - PPG Industries