**Core Concept**
Chronic amoebic keratitis is a rare but serious infection of the cornea caused by the protozoan parasite *Acanthamoeba*. It is often associated with contact lens wear and exposure to contaminated water.

**Why the Correct Answer is Right**
Acanthamoeba keratitis is typically seen in individuals who wear contact lenses, especially those who clean and store them in tap water. The amoeba can penetrate the corneal epithelium and cause a chronic, painful infection that can lead to vision loss if left untreated. The pathogenesis involves the amoeba's ability to form cysts, which are resistant to disinfectants and can survive on contact lenses.

**Why Each Wrong Option is Incorrect**
**Option A:** Other types of keratitis, such as bacterial or fungal keratitis, are not directly associated with Acanthamoeba infection.
**Option B:** While wearing contact lenses is a risk factor for Acanthamoeba keratitis, it is not the only risk factor, and the question is asking for the specific type of keratitis.
**Option C:** This option is vague and does not specify the type of keratitis, making it an incorrect choice.

**Clinical Pearl / High-Yield Fact**
Acanthamoeba keratitis is often associated with exposure to contaminated water, including tap water, which can contain the amoeba. Contact lens wearers should avoid using tap water to clean and store their lenses.

**Correct Answer:** A. Chronic amoebic keratitis is seen in individuals who wear contact lenses and are exposed to contaminated water, especially tap water.