Which lens is used to correct nearsighted vision?

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

Answer: (B)

Nearsighted vision is corrected by changing where light is focused so it lands on the retina. In myopia, light from distant objects is focused in front of the retina because the eye’s optical power is too strong or the eyeball is too long. A concave (diverging) lens is used because it spreads incoming light outward, effectively increasing the focal length so the rays are focused farther back, onto the retina. This makes distant objects appear sharp. A convex lens would make the eye focus even more in front, worsening the blur for myopia. A plano lens wouldn’t change the focus, and an aspheric lens refers to a lens shape used in various optics but doesn’t address the specific correction needed for myopia.