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Four cases of traumatic optic nerve blindness in the horse
Author(s) -
MARTIN L.,
KASWAN RENEE,
CHAPMAN W.
Publication year - 1986
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.1111/j.2042-3306.1986.tb03569.x
Subject(s) - optic nerve , medicine , blindness , lesion , atrophy , pathological , anatomy , ophthalmology , surgery , pathology , optometry
Summary Traumatic optic nerve atrophy is characterised clinically by a unilateral or bilateral sudden onset of blindness. Dilated, fixed pupils and a lack of a menace reflex are the only abnormalities noted soon after the trauma. Within three to four weeks the optic disc becomes paler and the retinal vasculature is markedly decreased. The pathological lesion is a rupture of the nerve axons from stretching forces produced by the posterior movement of the brain against the fixed canalicular portion of the optic nerves. Medical therapy has not been successful.