Synchrony dual optic accommodating iol
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When light enters the eye, it does not focus directly on the retina, but focuses beyond the retina. Long-sightedness occurs when: The cornea is the transparent layer at the front of the eye, and the lens focuses light on to the retina (the light-sensitive layer at the back of the eye).This causes near images to appear out of focus and blurred. There are various causes of long-sightedness including age, genetics and certain underlying medical conditions, such as diabetes (where there is too much glucose in the blood). The problem usually corrects itself as the child’s eyes develop.
The cornea should be shaped like a football, but in cases of astigmatism it has an irregular curve, more like a rugby ball.Generally, short-sightedness happens when the eye continues to grow and becomes too long from front to back As a result, light rays don’t reach the retina at the back of the eye. This means that objects in the distance seem blurred.Most cases of short-sightedness are caused by a combination of genetic and environmental factors that disrupt the normal growth of the eye.Presbyopia is a condition that affects most people over the age of 40.As we age, the natural lens of the eye becomes harder and less elastic.This means that light rays entering the eye are not focused properly, creating a blurred image. However, it sometimes develops after an injury to the eye or as a complication of an eye operation.
How it is diagnosed Astigmatism is usually diagnosed after a routine eye test, which often involves testing your ability to focus your eyes.
The symptoms of short-sightedness often start around puberty and get gradually worse until the eye is fully grown.
Therefore it’s important to have regular eye examinations. Refractive eye conditions are caused when problems with the structure of the eye affects how light rays enter your eye.
This reduces the eye’s ability to focus sharply on nearby objects and reading glasses are required.
Some people will need bifocal or varifocal glasses to see clearly at all distances.
Treating short-sightedness There are three main treatment options for short-sightedness.