Glaucoma is a group of eye conditions that damage the optic nerve, often due to increased pressure in the eye. This pressure can result from a buildup of fluid that normally drains from the eye. If left untreated, glaucoma can lead to vision loss or blindness. There are different types of glaucoma, including open-angle glaucoma and angle-closure glaucoma. Symptoms may not be noticeable in the early stages, making regular eye exams important for early detection. Treatment options include medications, laser therapy, and surgery to help lower eye pressure and protect vision.