Which lens is used to correct farsighted vision?

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

Answer: (B)

Farsighted vision happens when the eye doesn’t bend light enough (or is too short), so light from nearby objects focuses behind the retina. To see close objects clearly, the eye needs extra converging power before the light reaches it. A convex lens provides that by bending incoming light toward each other, moving the focal point forward so the eye can focus on the retina. That’s why a convex lens is used to correct farsightedness. A concave lens would spread light apart, worsening the focus for near objects. A plano lens has no focusing power, so it wouldn’t correct vision. A cylindrical lens changes focus in only one direction and is used for astigmatism, not general farsightedness.