NBEO Optics & Lens Design 2

Question 1

What is anti-reflective (AR) coating on lenses?

Accepted Answer

A multi-layer thin-film coating that reduces light reflection from lens surfaces, improving visual clarity, reducing glare, and enhancing cosmetic appearance

Answer

A scratch-resistant coating

Answer

A UV-blocking tint

Answer

A water-repellent treatment

Question 2

What is high-index lens material?

Accepted Answer

Lens material with a higher refractive index that bends light more efficiently, allowing thinner and lighter lenses for strong prescriptions

Answer

A lens material for children only

Answer

The cheapest lens option

Answer

A lens that blocks blue light

Question 3

What is vertex distance and why does it matter?

Accepted Answer

The distance from the back surface of a spectacle lens to the front of the cornea, which affects the effective power of the lens

Answer

The distance between a patient's two eyes

Answer

The thickness of the lens at its center

Answer

The focal length of the lens

Question 4

What is a photochromic lens?

Accepted Answer

A lens containing molecules that darken when exposed to UV light and return to clear indoors

Answer

A lens that permanently changes color

Answer

A prescription for nearsightedness

Answer

A type of progressive lens

Question 5

What is the optical center of a lens?

Accepted Answer

The point on the lens through which light passes without being deviated by prismatic effect, which must align with the patient's pupil

Answer

The physical center of the lens

Answer

The thickest part of the lens

Answer

The point where the lens is mounted in the frame

Question 6

What is blue light filtering in ophthalmic lenses?

Accepted Answer

Lens treatments or materials that selectively filter high-energy visible (blue) light from digital screens and sunlight

Answer

A coating that makes lenses appear blue

Answer

A type of UV protection

Answer

A test for color blindness