Hypermetropia can arise either because (i) the focal length of the eye lens is too long or (ii) the eyeball has become too small.
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Hypermetropia can arise either because (i) the focal length of the eye lens is too long or (ii) the eyeball has become too small.
Hypermetropia, or farsightedness, can result from two possible causes. The first cause is an eyeball that is too short, which leads to light focusing behind the retina when viewing both near and distant objects. The second cause is a cornea or lens with insufficient refractive power. In this case, light entering the eye is not refracted enough, causing the focal point to fall behind the retina. Both scenarios result in difficulty focusing on close objects, and corrective lenses with convex surfaces are commonly used to converge light properly, enabling individuals with hypermetropia to see clearly at various distances.