29/08/2026
👁️ Look closely—can you spot two unusual findings in this eye?
Beau was examined last week for a painful eye and was found to have a corneal ulcer—an injury to the clear surface of the eye.
The bright green area in the photograph is fluorescein dye adhering to the damaged cornea and highlighting the ulcer. Corneal ulcers can be very painful and may deteriorate quickly. Squinting, excessive tearing, swelling, cloudiness or reluctance to open an eye should always be treated as reasons to get your vet out promptly.
During the examination, something very unusual was discovered: two pupillary openings within the one iris. This appearance is sometimes described as polycoria. True polycoria, in which both openings respond to changes in light, is extremely rare.
Thank you to the owner, Thomson for sharing this fascinating photograph.
Polycoria is certainly not something we encounter every day in equine practice!