In corrective eyewear for nearsightedness, which lens is used?

• A. Convex lens
• B. Concave lens
• C. Plano lens
• D. Aspheric lens

Answer: (B)

Nearsightedness happens when light from distant objects is focused in front of the retina. To fix this, you need to spread the incoming light slightly before it enters the eye so the eye’s lens can form the image right on the retina. A concave (diverging) lens does this by making rays spread out before they reach the eye, so the eye can focus them properly on the retina.

A convex lens would bring rays together, which would blur distant objects more for someone who is nearsighted. A plano lens has no refractive power and wouldn’t correct the blurry distance vision. Aspheric lenses can reduce surface aberrations but don’t address the fundamental need to diverge distant light for myopia.