Return to work following unilateral enucleation in 34 horses (2000-2008).
REASONS FOR STUDY: The effect of unilateral enucleation on vision and potential loss of performance in horses has received little study.


OBJECTIVE
To evaluate the likelihood of return to prior discipline following unilateral enucleation in horses, assessing the role of age at enucleation, equine discipline, reason for enucleation, time to vision loss and eye enucleated.


OBJECTIVE
Unilateral enucleation has no significant effect on likelihood of return to work in horses, for both right and left eyes, across age and discipline.


METHODS
A retrospective review of medical records identified 92 horses that underwent unilateral enucleation at the University of Pennsylvania New Bolton Center from April 2000-April 2008. Case variables determined from the medical record included breed and sex of horse, age at enucleation, which eye was enucleated, reason for enucleation and onset of vision loss. Pre- and post operative occupations were determined by telephone interview with the owner or trainer of each horse.


RESULTS
Based on hospital surgery logs, 92 enucleations were performed over the 8 year period and 77 records were available for review, with follow-up information available for 34 horses. Of these, 29/34 (85%) horses returned to work in pleasure or trail riding (11/13), flat racing (7/10), hunter/jumpers (4/4), dressage (3/3), group lessons (1/1), eventing (1/1), steeplechase (1/1) and as a broodmare (1/1). Four of 5 horses (4/34, or 12% sample) that did not return to work (2 pleasure and 2 racing) were retired due to anticipated or perceived decrease in performance or behaviour change following unilateral enucleation, with the remaining horse retired from racing for lameness issues unrelated to enucleation. Twenty-two of 25 horses (88%) with acute vision loss and 7/9 horses (78%) with gradual vision loss returned to their previous discipline.


CONCLUSIONS
Horses are able to return to a variety of occupations after unilateral enucleation.
New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, 382 West Street Road, Kennett Square, Pennsylvania 19348, USA.
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Utter
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Wotman
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Covert
D000818:Animals; D005128:Eye Diseases / Q000601:surgery / Q000662:veterinary*; D015353:Eye Enucleation / Q000534:rehabilitation / Q000662:veterinary*; D005260:Female; D006734:Horse Diseases / Q000601:surgery*; D006736:Horses; D008297:Male; D010805:Physical Conditioning, Animal; D012189:Retrospective Studies