(medicine) The anatomy, functions, pathology, and treatment of the eye.
The art and science of vision and eye care.
The science which treats of the structure, functions, and diseases of the eye.
Measurement of the range of vision, esp. by means of the optometer.
the branch of medicine concerned with the eye and its diseases
As defined (with minor variations) in the statutes of various States of the United States:
Ophthalmology () is a branch of medicine and surgery that deals with the diagnosis and treatment of disorders of the eye. An ophthalmologist is a physician who specializes in ophthalmology.
the practice of an optometrist
Optometry is a health care profession that involves examining the eyes and applicable visual systems for defects or abnormalities as well as prescribing the correction of refractive error with glasses or contact lenses and the treatment of eye diseases. Traditionally, the field of optometry began with the primary focus of correcting refractive error through the use of spectacles.