The third eyelid is supported by a “T-shaped” cartilaginous structure. Occasionally, this cartilage may be malformed, typically resulting in bending or “scrolling” of the leading edge of the third eyelid and consequent eversion of these tissues away from the ocular surface. This condition is generally congenital and may be unilateral or bilateral. Secondary conjunctivitis and/or partial prolapse of the third eyelid lacrimal gland (“cherry eye”) may be associated with scrolling of the third eyelid cartilage. Commonly affected breeds include the Great Dane.