Epithelial xerosis of conjunetiva is caused by ?
**Core Concept**
Epithelial xerosis of the conjunctiva refers to a condition characterized by dryness and scaling of the conjunctival epithelium. This condition is often associated with decreased tear production or abnormal tear composition.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of dry eye syndrome, which involves decreased tear production or abnormal tear composition. Inadequate tear production leads to reduced mucin and lipids in the tears, resulting in a lack of surface tension and increased evaporation of the tears. This causes dryness and irritation of the conjunctiva, leading to xerosis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not directly relate to epithelial xerosis of the conjunctiva. While inflammation can cause conjunctival irritation, it is not the primary cause of epithelial xerosis.
**Option B:** This option is incorrect because it is a symptom of dry eye syndrome, not a cause of epithelial xerosis.
**Option C:** This option is incorrect because it is a type of conjunctival disorder that involves inflammation and not necessarily dryness or xerosis.
**Clinical Pearl / High-Yield Fact**
Dry eye syndrome is a common condition that affects millions of people worldwide, and it is often associated with decreased tear production or abnormal tear composition. Patients with dry eye syndrome may experience symptoms such as dryness, irritation, and blurred vision.
**Correct Answer: D. Keratinization.**