Eyelid malpositions ( Entropion, Ectropion)
The eyelids may have malpositions like Entropion where the margin rolls in such that the eye lashes rub against the eyes and cause irritation. This needs to be surgically corrected since it can cause corneal irritation and infection.

The condition where the eyelid margin rolls out  away  from the eyball is called Ectropion. This may be due to injury or due to looseness of the eyelid caused by aging changes. It causes watering and redness of the eye, sometimes significant enough to require surgical correction.

Entropion of lower eyelid

Surgical correction of Entropion lower lid