A corneal abrasion is when there has been some form of physical trauma to the eye which has impacted the eye surface.
A corneal ulcer (microbial keratitis) is where there is an open wound on the cornea that is often caused by a bacterial infection. A viral or fungal infection may also cause this. It is critical that anyone with this condition is treated promptly so that treatment can be provided as this may result in loss of vision.
In some cases, an abrasion may lead to recurrent corneal erosion syndrome. In this condition, the abrasion can recur without an injury; this typically occurs at night or on waking.
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