Ectropion
human disease
Ectropion is a medical condition in which the lower eyelid turns outwards. It is one of the notable aspects of newborns exhibiting congenital harlequin-type ichthyosis, but ectropion can occur due to any weakening of tissue of the lower eyelid. The condition can be repaired surgically. Ectropion is also found in dogs as an inherited, developmental condition.
Causes
The following are the causes:
Congenital
Aging
Scarring
Mechanical
Allergic
Facial nerve palsy
Anti-cancer treatments such as erlotinib, cetuximab, and panitumumab, which block the function of EGFR (the epidermal growth factor receptor).
In dogs
Ectropion in dogs usually involves the lower eyelid, with cicatricial upper eyelid eversion occurring following trauma or chronic inflammation. Often the condition has no symptoms, but when the lower lid impacts lacrimation the eye is not able to be lubricated and exposure to irritants (e.g. bacteria, dust) causing secondary conjunctivitis. Ectropion is typically congenital, with it being breed-related and hereditary. Predisposed breeds are the Bloodhound, Saint Bernard, Great Dane, Newfoundland dog, Mastiff, some Spaniel species, and some French hunting breeds.
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This entry incorporates text from “Ectropion” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.