Definition of Entropion
Entropion is the inversion, or rolling inward, of all or part of the edge of an eyelid, which causes the hair-bearing part of the lid to come into contact with the outside of the eyeball. This creates friction, irritation and discomfort and can severely damage the eye. Entropion has a strong genetic component and often is present at birth due to a hereditary abnormality in the dog’s facial structure. It is much more common in breeds with flat faces, short muzzles and heavy facial skin folds. It can also be acquired as a result of trauma, inflammation or infection and from skin laxity associated with aging. Entropion usually – but not always - occurs in both eyes. It can affect the upper eyelids, the lower eyelids or both, although it is more common on lower lids. Symptoms of the condition include excessive tearing, squinting, eye redness and pain.