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Eye and Vision

Good vision has its origin in the accurate focusing of sharp images on the retina of the eye. If the light is not focused directly on the retina but in front of or behind it, the result is blurry vision. This is called a refractive error.

Aufbau des Auges

Human eye and vision

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



Kurzsichtigkeit

Nearsightedness or myopia

For the nearsighted eye, objects at a far distance are not focused correctly.




Weitsichtigkeit

Farsightedness or hyperopia

For the farsighted eye, objects at a close distance are out of focus.




Astigmatism

In addition to nearsightedness or farsightedness, astigmatism occurs frequently. Images of objects at a close as well as a far distance appear distorted.

Presbyopia

The ability of the eye lens to change its shape in order to focus on different distances decreases with age. As a result, every person with normal vision (starting at approximately age 40 - 45) will need reading glasses for close-up vision.