Tear ferning test in horses and its correlation with ocular surface evaluation.

Objective: To describe the tear ferning test (TFT) in healthy horses and its correlation with other parameters for evaluating the ocular surface.

Animals Studied: Thirty male and female adult healthy horses (60 eyes), of no defined breed.

Procedures: Tear sample was collected with a microcapillary tube, placed on the surface of a glass slide, and allowed to dry at room temperature.