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

Anti-reflective coating

Answer

Photochromic treatment

Answer

Polarized filter

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

The lenses are already at maximum tint density before entering the car

Answer

The heat inside the car prevents the photochromic chemical reaction

Answer

Photochromic lenses only activate in temperatures below 50°F

Question 3

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

Accepted Answer

Paper towels or rough fabrics

Answer

Microfiber cloths

Answer

Lens cleaning spray solution

Answer

Warm water rinse

Question 4

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

Accepted Answer

Gray tint

Answer

Yellow/amber tint

Answer

Gradient tint

Answer

Brown tint

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

Provides maximum UV radiation protection

Answer

Increases lens durability and impact resistance

Answer

Eliminates all glare from reflected surfaces

Question 6

What is the correct order in which coatings are typically applied to a standard AR-coated ophthalmic lens?

Accepted Answer

UV coat → hard coat → AR coat → hydrophobic coat

Answer

Hard coat → AR coat → UV coat → hydrophobic coat

Answer

AR coat → hard coat → UV coat → hydrophobic coat

Answer

Hydrophobic coat → AR coat → hard coat → UV coat

Question 7

Which lens material inherently provides 100% UV protection up to 400 nm without requiring an additional UV coating?

Accepted Answer

Polycarbonate

Answer

CR-39 plastic

Answer

Standard crown glass

Answer

High-index 1.60