Glaucoma is a group of eye conditions that can cause damage to the optic nerve, which is responsible for transmitting visual information from the eye to the brain. This damage is often caused by an increase in intraocular pressure (IOP), the pressure inside the eye. Glaucoma can lead to vision loss and blindness if left untreated. There are different types of glaucoma, including open-angle glaucoma, which is the most common type and develops slowly over time, and angle-closure glaucoma, which is less common but can develop suddenly and is considered a medical emergency. Risk factors for glaucoma include age, family history, ethnicity, high eye pressure, and certain medical conditions such as diabetes and high blood pressure. Treatment options for glaucoma include eye drops, oral medications, laser surgery, and conventional surgery, with the goal of reducing the intraocular pressure to prevent further damage to the optic nerve.