Final answer:
Chronic blepharitis is the most common cause of trichiasis, an inward turning of eyelashes. Trachoma can cause trichiasis too but is rare in the United States. The option (C) is correct.
Step-by-step explanation:
The most common cause of trichiasis, where one or multiple eyelashes turn inward toward the eyeball, is chronic blepharitis. Blepharitis is an inflammation of the eyelids that can develop into trichiasis due to ongoing irritation and damage caused to the eyelids. Other potential causes could include trauma or entropion, which is a condition causing the eyelid to fold inward.
However, chronic blepharitis is recognized as the most prevalent cause and can be associated with various factors, including bacterial infections or skin conditions. It's worth noting that trachoma, a condition that can lead to trichiasis, is very rare in the United States due to better public health standards and hygiene, whereas it is a significant cause of preventable blindness in certain parts of the world lacking these health measures.
This question is not complete, Here I am attaching the complete question:
Trichiasis is an inward turning of one or multiple eyelashes towards the eyeball. Which of the following is the MOST common cause of trichiasis?
(A) Trauma
(B) Entropion
(C) Chronic blepharitis