Surgical repair of third eyelid lacerations in three birds

The third eyelid, or membrana nictitans, is well developed in all avian species, and normal function of the third eyelid is necessary for maintaining a healthy ocular surface. Two cranes and a lovebird were presented for evaluation of unilateral third eyelid lacerations that compromised movement of the third eyelid. The lacerations were repaired using microsurgical techniques, with emphasis placed on identifying the pyramidalis tendon and marginal plait, determining their integrity, and ensuring proper mobility of the third eyelid. One bird had a full-thickness laceration of the pyramidalis tendon that required reattachment. All three birds regained normal function of the third eyelid, and the development of secondary corneal disease was prevented. Surgical reconstruction of third eyelid lacerations is strongly recommended because of the integral role played by the third eyelid in maintaining a normal ocular surface.