Eye Examination Techniques in Horses

Complete ophthalmic examination in the horse generally requires sedation and an auriculopalpebral nerve block. Before sedation, the symmetry of the head and globes are examined followed by evaluation of the menace response and palpebral reflex. After sedation and akinesia of the auriculopalpebral nerve, the adnexal structures, cornea, and pupillary light reflexes are examined. Diagnostics, including fluorescein staining, cytology, culture, Schirmer tear test, and tonometry, are often indicated at this time. The examination is continued with evaluation of the anterior segment, mydriasis, and indirect and direct ophthalmoscopy. Subpalpebral lavage systems are often required for the treatment of painful corneal conditions. Subpalpebral lavage systems are relatively easy to place and are relatively problem-free if maintained properly.