Optics 101

Short-Sightedness - Definition and How Does It Affect My Vision, Diagnostic and Treatments of Short-Sightedness

Definition of Short-Sightedness

The medical term for short-sightedness is referred to as myopia. It is a visual defect that results in the eye being too long from front to back, or from the cornea being too steeply curved. When light comes into the eye, it is focused onto the retina. A clear image is obtained if the light is properly focused on the retina. This is normal vision.

How Does Short-Sightedness Affect My Vision

The problem with short-sightedness is that the eyeball is too long or the cornea is too long. What this means is that light is focused in front of the retina, rather than directly on it. As a result, making distant objects seems blurry, while close objects can still be seen clearly.

Diagnostic of Short-Sightedness

A simple vision test using an eye chart is usually used to diagnose short-sightedness. The eye chart commonly referred to as a Snellen chart. The chart is composed of a number of rows of letters of different sizes. The vision level of a person can be determined by the smallest line of letters that person can read at a distance of six meters.

Treatments of Short-Sightedness

Short-sightedness can be corrected with glasses or contact lenses. The way they work is by refocusing the image onto the retina rather than in front of the retina. Another approach to correct short-sightedness is by surgery, for example, laser surgery. Surgery works by changing the shape of the cornea; hence the eye can focus accurately.

Source: AZoOptics


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