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vision defects click to hear : vision defects

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

hyperopia click to hear : hyperopia

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 : focus

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 : convex lens

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