Dorzolamide HCl is primarily used in ophthalmology as a topical medication to manage elevated intraocular pressure in patients with open-angle glaucoma or ocular hypertension. It works by inhibiting the carbonic anhydrase enzyme in the ciliary processes of the eye, reducing the production of aqueous humor and thereby lowering eye pressure. This helps prevent optic nerve damage and vision loss associated with these conditions. It is often prescribed in combination with other glaucoma medications for enhanced efficacy. Patients typically apply it as eye drops, following their healthcare provider's instructions for dosage and frequency.