Physics explaining nearsightedness and farsightedness (myopia and hypermetropia)


Myopia and HypermetropiaMyopia - Short Sighted

Myopia is the term used to define short sightedness. Light from a distant object forms an image before it reaches the retina. This could be because the eye is too long, or the cornea or crystalline lens is too strong.
A myopic person has clear vision when looking at objects close to them, but distant objects will appear blurred.
Myopia is easily corrected at your local Vision Express optician using prescription glasses or contact lenses specifically designed to counteract the effect. A concave lens (diverging - minus powered) is placed in front of a myopic eye, moving the image back to the retina and clarifying the image.

Myopia and Hypermetropia
Hypermetropia (Hyperopia) - Long Sighted

Hypermetropia means long sight and is where the image of a nearby object is formed behind the retina. This could be because the eye is too short, or the cornea or crystalline lens does not refract the light enough.
A hypermetropic person may have blurred vision when looking at objects close to them, and clearer vision when looking at objects in the distance. By placing a convex (converging - plus powered) lens in front of a hypermetropic eye, the image is moved forward and focuses correctly on the retina


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