<unk>  is a medical condition in which the eyelids fold inward. It is very uncomfortable, as the eyelashes rub against the cornea constantly.<unk>  is usually caused by genetic factors and may be congenital. Trachoma infection may cause scarring of the inner eyelid, which may cause<unk> .
Symptoms of<unk>  include:
Redness and pain around the eye
Sensitivity to light and wind
Sagging skin around the eye
Excessive tearing
Decreased vision, especially if the cornea is damaged
Treatment is a simple surgery in which excess skin of the outer lids is removed. Prognosis is excellent if surgery is performed before the cornea is damaged.
Entropion
Methylphenidate 
Atomoxetine
Bupropion
Guanfacine
Mipomersen
Imipramine
Dexmethylphenidate