Eye and Vision

Good vision has its origin in the sharp focusing of images on the retina of the eye.

The optical system of the eye, which consists of cornea, lens and vitreous body, bends rays of light (images which we see) in a way that they come to focus exactly on the retina of the eye. This bending of light rays is called refraction. The different components of the optical system comprise the refractive power which is indicated in diopter.

Normal vision (Emmetropia)

Eyes with normal vision see images at a close distance as well as images at a far distance clearly. The point of refraction is exactly on the retina.

Nearsightedness (Myopia)

You are able to see objects at a close distance sharply whereas objects at a far distance appear blurry.

Farsightedness (Hyperopia)

The farsighted eye is able to see objects at a far distance sharply whereas objects at a close distance appear blurry.

Astigmatism

Images of objects at a close as well as at a far distance appear distorted: A dot in real life will produce an image of a line.

Presbyopia

With advancing age, the natural crystalline lens hardens and its ability to change its shape to focus on images in different distances decreases. Farsighted people or those with normal vision can compensate this deficit with reading glasses.

Additional information

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