NAO VOLUME IV QUESTIONS WITH ACTUAL SOLUTIONS

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 _____ 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 The denser the tint in a lens, the _____: - ️️Less transmission of light through the lens Standard transmission in sunlenses should range between: - ️️15% and 30% A characteristic of a dark tinted glass lens with an RX of +4.00D sphere would b_____ - ️️Dark in the center and lighter on the edge 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: - ️️green Glare is of more concern to which wearer? - ️️cataract patient The amount of reflection of each surface of CR-39 plastic lenses is approximately: - ️️4% Which company introduced CR-39 plastic lenses? - ️️PPG Industries What is the index of refraction of polycarbonate? - ️️1.59 The quality of today's polycarbonate lenses has been improved due to the demand of what product? - ️️compact discs Birefringence is also referred to as _____ and can result in distortion reducing the visual performance to the wearer? - ️️double refractionWhat is the index of refraction of trivex? - ️️1.53 Features and benefits of trivex include_____: - ️️superior optics, impact resistance, ultra-light weight (all of the above) The absorption of light in lenses is classified by two variables. What are they? - ️️Tint and lens transmission