Ophthalmologist
An ophthalmologist - Eye M.D. - is a medical or osteopathic doctor who specializes in eye and vision care. Ophthalmologists are specially trained to provide the full spectrum of eye care, from prescribing glasses and contact lenses to complex and delicate eye surgery. Many ophthalmologists are also involved in scientific research into the causes and cures for eye diseases and vision problems.

Optometrist
An optometrist receives a Doctor of Optometry (OD) degree and is licensed to practice optometry, not medicine. The practice of optometry traditionally involves examining the eye for the purpose of prescribing and dispensing corrective lenses, screening vision to detect certain eye abnormalities, and prescribing medications for certain eye diseases.

Optician
These technicians are trained to design, verify and fit eyeglass lenses and frames, contact lenses, and other devices to correct eyesight. They use prescriptions supplied by ophthalmologists or optometrists, but do not test vision or write prescriptions for visual corrections. Opticians are not permitted to diagnose or treat eye diseases.