Ophthalmologists are medical doctors (MDs) who specialize in eye
care. Ophthalmology is a surgical subspecialty. Ophthalmologists are licensed
by state medical boards to practice medicine and are usually board-certified in
ophthalmology. Ophthalmologists are certified to:
Most of the focusing power in the eye occurs along the front surface, called the cornea, which is the clear "window" in the front of the eyeball. The next structure involved in focussing is the lens, which sits behind the cornea inside the eye. The ideal cornea has a symmetrically curved surface, like a basketball. Astigmatism is caused by a cornea or a lens that is not symmetrical. As a result, people with significant astigmatism may have distorted or blurry vision.
Astigmatism is measured in...
Diagnose refractive errors and prescribe
Detect signs of disease and refer you to an
Administer diagnostic drugs.
and treat eye diseases and prescribe therapeutic drugs (in most states).
Perform some eye surgery (in some states).
Opticians are skilled technicians. They do not test vision, prescribe
corrective lenses, or diagnose or treat eye diseases. Some states require
completion of a 2-year training program or a 3-year apprenticeship for a
license. Others have no formal requirements. Opticians can:
Fill prescriptions for eyeglasses and contact
Help you select appropriate eyeglass frames and measure the
eyes to ensure a proper fit.
Both ophthalmologists and optometrists can diagnose refractive
errors, such as nearsightedness, and prescribe corrective lenses, such as
glasses or contact lenses.
Ophthalmologists can diagnose all disorders that affect the eye.
They can carry out any medical or surgical treatment.
In a few states, even where they are allowed to administer
diagnostic drugs, optometrists are not allowed to diagnose or treat eye
disease. They may observe signs of disease and refer you to an ophthalmologist.
On average, optometrists charge less for routine eye exams than
ophthalmologists. You may also be able to get an appointment with an
optometrist sooner than with an ophthalmologist. Optometrists are more likely
than ophthalmologists to offer evening and weekend appointments.
In this article
This information is produced and provided by the National
Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National
Institute via the Internet web site at http://
.gov or call 1-800-4-CANCER.
WebMD Medical Reference from Healthwise
June 11, 2013
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this