Corneal scarring/disfigurement

The cornea is the thin, transparent structure at the front of the eye. Any opacity or scarring of the cornea can prevent light from passing through it, or cause the light to scatter, causing glare. 

There are many causes of scarring or opacity, from injury or a foreign body entering the eye, to diseases such as measles, or infections such as herpes simplex. Over-wear of contact lenses (i.e. wearing them for excessively long periods of time) can also increase the risk of serious complications and give rise to lasting opacity or scarring.

Contact lenses may be used either to mask the appearance of scarring and improve cosmetics, or in some cases to provide an artificial pupil to prevent light scatter due to an opacity.

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