ABO NOCE Basic Opticianry Lens Coatings and Treatments 2

Question 1

Which lens treatment is specifically designed to filter high-energy visible (HEV) blue light in the 380–500 nm range?

Accepted Answer

Blue light blocking coating

Answer

Blue light blocking coatings selectively filter or reflect high-energy visible light in the 380–500 nm range, which is associated with digital eye strain and discussed as a factor in potential retinal stress.

Question 2

Why do most photochromic lenses fail to darken effectively inside an automobile?

Accepted Answer

Car windshields block the UV radiation needed to activate the photochromic reaction

Answer

Car windshields are manufactured with UV-filtering glass or laminate that blocks the UV radiation required to trigger the photochromic darkening reaction, leaving the lenses mostly clear inside a vehicle.

Question 3

When cleaning AR-coated lenses, which material should be avoided to prevent coating damage?

Accepted Answer

Paper towels or rough fabrics

Answer

Paper towels and rough fabrics contain abrasive fibers that can scratch the delicate AR coating layers; microfiber cloths are recommended because they are soft and non-abrasive.

Question 4

Which tint color provides the most neutral, uniform color perception across the visible spectrum?

Accepted Answer

Gray tint

Answer

Gray tints absorb light relatively evenly across all visible wavelengths, providing neutral color perception without altering how colors appear, making them ideal for general outdoor use.

Question 5

What is the primary advantage of a mirror coating applied to sunglass lenses?

Accepted Answer

Reduces the amount of light reaching the eye by reflecting it away from the lens surface

Answer

Mirror coatings reflect a significant portion of incident light before it reaches the eye, reducing light transmission and making them useful in extremely bright environments like snow or water sports.

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Practice Test

ABO NOCE Basic Opticianry Lens Coatings and Treatments 2