The Ophthalmologist is a medical doctor who specializes in the treatment of eye diseases. He is trained to provide medical, surgical and/or optical treatment. The Optometrist is trained to examine your eyes, fit, and supply glasses and contact lenses. They also recognize signs of eye diseases and will refer patients to the Ophthalmologist. The Optician is trained to fit and supply glasses prescribed by the Ophthalmologist or Optometrist.