Dr. John Vassallo is an ophthalmologist practicing in Saint Augustine, FL. Dr. Vassallo specializes in eye and vision care. As an ophthalmologist, Dr. Vassallo can practice medicine as well as surgery. Opthalmologists can perform surgeries because they have their medical degrees along with at least eight years of additional training. Dr. Vassallo can diagnose and treat diseases, perform eye operations and prescribe eye glasses and contacts. Ophthalmologists can also specialize even further in a specific area of eye care.