A<unk>  is an erosion or open sore in the outer layer of the<unk>  the transparent area at the front of the eyeball that covers the iris and pupil.
Corneal ulcer
Band keratopathy
Periorbital cellulitis
Corneal perforation
Pitted keratolysis
Orbital cellulitis
Otosclerosis
Iridocorneal endothelial syndrome