Used in ophthalmology to reduce intraocular pressure in patients with glaucoma or ocular hypertension. It works by decreasing the production of aqueous humor in the eye, helping to prevent damage to the optic nerve and preserve vision. Often prescribed as a topical eye drop solution, it is effective in both open-angle glaucoma and chronic angle-closure glaucoma. Its selective action on adrenergic receptors minimizes systemic side effects, making it a preferred option for long-term management.