**Core Concept**
Ball's operation is a surgical procedure used to treat a specific condition affecting the eye. It involves the removal of a part of the eye to alleviate symptoms. This operation is typically performed to address a condition that affects the eye's anterior segment.

**Why the Correct Answer is Right**
The correct answer is related to the treatment of a condition called congenital glaucoma. In this condition, the pressure inside the eye is extremely high due to improper drainage of the aqueous humor. Ball's operation involves the removal of part of the eye, which helps to reduce intraocular pressure. This procedure is specifically designed to address the issue of improper drainage in the anterior chamber of the eye. The operation is typically performed on young children with congenital glaucoma.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Ball's operation is not typically used to treat cataracts. Cataract surgery involves the removal of the lens, which is a different procedure.
* **Option B:** This option is incorrect because Ball's operation is not related to the treatment of retinal detachment. Retinal detachment surgery involves the reattachment of the retina to the back of the eye.
* **Option C:** This option is incorrect because Ball's operation is not used to treat ptosis. Ptosis surgery involves the correction of eyelid drooping.

**Clinical Pearl / High-Yield Fact**
Ball's operation is a classic example of a surgical procedure designed to address a specific anatomical issue in the eye. It highlights the importance of understanding the underlying anatomy and physiology of the eye in order to diagnose and treat conditions effectively.

**Correct Answer:** C. Ball's operation is done for congenital glaucoma.