Lumigan 0.03 is a brand name for a medication called bimatoprost ophthalmic solution. It is primarily used to treat glaucoma and ocular hypertension, conditions characterized by increased pressure in the eye that can lead to vision loss if left untreated. Bimatoprost, the active ingredient in Lumigan 0.03, belongs to a class of medications called prostaglandin analogs. It works by reducing intraocular pressure by increasing the outflow of fluid from the eye.