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A healthy corneal epithelium is able to heal within 48h. Antibiotics must be applied to avoid a secondary infection. It also provides hydration to the cornea by its liquid content. An ulcer that is not closed after 7 days is a real problem. In cats herpetic ulcers are also of high concern.
Lots of products exist to help or facilitate epithelium healing.
But if the ulcer is not closed after a week or so, it will necessitate intervention such as manual desepithelialization under local anesthesia, grill keratectomy, 3rd eyelid closure, graft ...
It is very important at this stage to determine if the ulcer is indolent and its depth to adapt the technique.