The third eyelid is supported by the T-shaped cartilage in the canines, and sometimes deformation of the cartilage can lead to a condition called “Third Eyelid Cartilage Eversion”. This disease is one of the common disorders of third eyelid particularly in Dobermans, German Shepherds and and can easily be confused with cherry eye. In this retrospective study three dog affected by Third eyelid cartilage eversion have been presented to veterinary hospital of ferdowsi university and and underwent surgery after diagnosis. Patient was positioned appro- periatly to access affected eye and corneal & conjunctival sutfaces aseptically prepared for surgery. Lower eyelid margins were also kept open with two stay sutures. A horizontal incision (parallel to marigin of T-shaped cartilage) made on the bulbar surface of third eyelid and bluntly dissected to the eyelid cartilage and the cartilage is then re- sected from malformed point. Third eyelid incision was not closed in order to heal with second intention process. Ciprofloxacin and beta- methasone eyedrop administered for 5 days. In 6-12 months post op- eration follow-ups no complication was observed with any of the pa- tients. Evertion of the third eyelid and continuous contact with corneal surface can irritate the eye and cause purulent discharge or sometimes keratoconjunctivitis sica (KCS). Partial resection of the third eyelid cartilage is superior to total resection because complete resection re- duces the stiffness of the third eyelid and results in lesser potency to cover eye surface.

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