## **Core Concept**
Alkali injuries to the eye are severe chemical burns caused by alkaline substances coming into contact with the ocular surface. These injuries can lead to significant morbidity, including vision loss, due to damage to the cornea and conjunctiva. The severity of the injury depends on the concentration and type of alkali, as well as the duration of exposure.

## **Why the Correct Answer is Right**
The correct answer, **C. Ulceration and perforation**, is right because alkali injuries cause liquefactive necrosis of the corneal tissue, leading to ulceration. This process involves the saponification of fatty acids in cell membranes, resulting in cell death and tissue destruction. The damage can progress to perforation, which is a sight-threatening emergency.

## **Why Each Wrong Option is Incorrect**
- **Option A: Cataract formation** - While cataracts can occur as a complication of severe ocular injuries, they are not the immediate or most direct consequence of alkali injuries.
- **Option B: Hyphema** - Hyphema, or blood in the anterior chamber, is more commonly associated with traumatic injuries rather than chemical burns.
- **Option D: Retinal detachment** - Although retinal detachment can occur in the setting of ocular trauma or as a complication of severe ocular disease, it is not a direct consequence of alkali injury.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that immediate and thorough irrigation of the eye with water or saline is the critical first step in managing alkali injuries. This can significantly reduce the severity of the injury by removing the alkali substance from the ocular surface.

## **Correct Answer:** . Ulceration and perforation