Definition of Entropion:

Entropion is the turning in of the edges of the eyelid (usually the lower eyelid) so that the lashes rub against the eye surface.

Causes, incidence, and risk factors:

Entropion can be present at birth (congenital).

In babies, it rarely causes problems because the lashes are very soft and do not easily damage the cornea. In older people, the condition is usually caused by a spasm or weakening of the muscles surrounding the lower part of the eye. This causes the lid to turn inward.

Although rare in North America and Europe, trachoma infection can cause scarring of the inner side of the lid, which may cause entropion. Trachoma scarring is one of the three leading causes of blindness in the world.

Risk factors for entropion are:

• Aging
• Chemical burn
• Infection with trachoma