An eye specialist, also known as an ophthalmologist, is a medical doctor who specializes in the diagnosis and treatment of eye diseases and conditions. They are trained to perform eye exams, diagnose and treat eye diseases, prescribe medications and corrective lenses, and perform eye surgeries when necessary. Some common conditions that an eye specialist may diagnose and treat include: Cataracts Glaucoma Macular degeneration Diabetic retinopathy Retinal detachment Corneal disease Conjunctivitis (pink eye) Dry eye syndrome Strabismus (crossed eyes) Amblyopia (lazy eye)