**Question:** Recurrent corneal erosion is seen in –

A. Keratoconus
B. Epithelial basement membrane disorder (EBMD)
C. Corneal trauma
D. Corneal ectasia

**Core Concept:**
Recurrent corneal erosion is a condition characterized by repeated erosion of the protective layer (epithelium) on the cornea, leading to pain, redness, and foreign body sensation. The cornea is the transparent, dome-shaped outer layer of the eye responsible for refracting light and protecting the delicate inner structures. There are two types of corneal erosion:

1. Primary corneal erosion: The erosion occurs spontaneously without any preceding injury or trauma.
2. Secondary corneal erosion: The erosion occurs after an injury or trauma to the cornea.

**Why the Correct Answer is Right:**
B. Epithelial basement membrane disorder (EBMD) is a specific cause of recurrent corneal erosion. EBMD is a disorder characterized by abnormal basement membrane separation in the corneal epithelium. This leads to an increased vulnerability of the corneal epithelium to erosion and subsequent symptoms.

**Why Each Wrong Option is Incorrect:**
A. Keratoconus is a degenerative disorder characterized by corneal thinning and cone-shaped protrusion leading to vision impairment. It is not related to recurrent corneal erosion.
C. Corneal trauma is a cause of secondary corneal erosion but is not the primary cause of recurrent corneal erosion itself.
D. Corneal ectasia is a condition characterized by the thinning and bulging of the cornea, often associated with keratoconus. It is not a primary cause of recurrent corneal erosion.

**Clinical Pearl:**
Recurrent corneal erosion can be challenging to diagnose and manage. It is essential for physicians to have a high index of suspicion for this condition in patients presenting with pain, foreign body sensation, and redness in the affected eye. A thorough history, examination, and ancillary tests like fluorescein staining can help diagnose the condition. Treatment options include conservative management (moisturizing eye drops, lubricants, and rest) and surgical options (e.g., phototherapeutic keratectomy, epithelial debridement, and amniotic membrane transplantation).

**Why the Correct Answer is Right:**
Epithelial basement membrane disorder (EBMD) is the correct answer because it represents a primary cause of recurrent corneal erosion. In EBMD, the basement membrane of the corneal epithelium is abnormal, which leads to an increased vulnerability of the corneal epithelium to erosion and subsequent symptoms.

**Why Each Wrong Option is Incorrect:**
1. Keratoconus is a degenerative disorder of the cornea that presents with symptoms like those of recurrent corneal erosion but is not the primary cause of recurrent corneal erosion.
2. Corneal ectasia is a condition characterized by corneal thinning and bulging, often associated with ker