Severe prolapse (slipping out of place) and/or bulging of the eye can be caused by trauma. It is uncommon in cats. The outcome depends on the extent of the trauma, depth of the eye socket, duration of the displacement, resting pupil size, condition of the eye, and other damage near the eye. In cats, forward displacement is usually caused by severe trauma to the head; often, facial bones are broken. The eyeball should be put back in place surgically as soon as possible if the cat is in good enough health to have general anesthesia. The upper and lower eyelids are temporarily stitched closed to protect the damaged eye and prevent recurrence. Treatment includes antibiotics (both given by mouth or injection and topical ointments or creams) to prevent infection. Occasionally other medications are needed as well. Although vision does not usually return in the injured eye, the eyeball can usually be saved.
Also see professional content regarding prolapse of the eye Prolapse of the Eye in Animals Traumatic proptosis in a dog. Traumatic proptosis in a cat. In acute proptosis, the eye has been forced out of the orbit as a result of trauma; eyelid spasms and inversion of the eyelid margin... read more 
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