What condition does an iridotomy treat?

An iridotomy is a surgical procedure aimed specifically at treating pupillary block, which is a type of angle-closure glaucoma. In pupillary block, the flow of aqueous humor is obstructed due to the position of the iris, causing a buildup of pressure within the eye. By creating a small hole (iridotomy) in the peripheral part of the iris, the surgeon facilitates proper drainage of fluid, thus alleviating the pressure and preventing damage to the optic nerve.

While the other options are related to various eye conditions, they do not directly involve the mechanism or pathology addressed by an iridotomy. Open Angle Glaucoma involves a different type of drainage problem and typically is treated medically or with different surgical interventions. Macular Degeneration impacts the retina and would be managed through different approaches, such as injections or laser therapy. Cataracts involve clouding of the lens and are treated through lens surgery, not an iridotomy. Hence, the focus of the procedure is specifically aligned with resolving issues arising from pupillary block.