BPSC 44th Exam Prelims 2002 Solved Paper

- The type of lenses used in reading glasses depends on the type of vision problem and may include both concave and convex lens.
Concave lenses are thinner in the center. These lenses are used to correct nearsightedness (myopia). Convex lenses are thicker in the center, like a magnifying glass. These lenses are used to correct far sightedness (hyperopia).