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vision defects [2]click to hear

Images do not form on the retina, thus resulting in blurry vision; such defects are corrected by eyeglasses, contact lenses or even surgery.
vision defects [2] hyperopia focus convex lens

hyperopia click to hear

The image of an object is formed behind the retina due to a defect in the light rays’ convergence as they pass through the lens. This makes near objects hard to see.

focus click to hear

Point where light rays converge to form an image; the brain interprets the retina’s upside-down image as right-side-up.

convex lens click to hear

Corrects hyperopia by causing light rays emanating from an object to converge and project an image onto the focus of the retina.