Define trichiasis.

Trichiasis is a medical condition in which the eyelashes grow inwards towards the eye, causing irritation, redness, and sometimes damage to the cornea. It can be caused by various factors such as aging, trauma, infections, or certain eye conditions. Treatment options include plucking the misdirected eyelashes, using lubricating eye drops, or in severe cases, surgery may be necessary to correct the problem.

Trichiasis is a medical condition in which eyelashes grow inward toward the eyeball, causing irritation and discomfort. It can occur in one or both eyes and can affect people of all ages. Trichiasis can be caused by:

- Blepharitis (inflammation of the eyelids)
- Trachoma (bacterial infection of the eye)
- Stevens-Johnson syndrome (a severe skin reaction)
- Chemical burns
- Trauma
- Tumors

Symptoms of trichiasis include:

- Eye irritation
- Redness
- Tearing
- Pain
- Sensitivity to light
- Blurred vision

Trichiasis can be diagnosed with a physical examination of the eye. Treatment options include:

- Electrolysis: A procedure that uses a small needle to destroy the hair follicles.
- Cryotherapy: A procedure that uses cold to destroy the hair follicles.
- Laser therapy: A procedure that uses a laser to destroy the hair follicles.
- Surgery: A procedure that removes the affected eyelashes.

If left untreated, trichiasis can lead to corneal scarring and vision loss.