optometry

The practice or profession of an optometrist.

The measurement of the range of vision.

The measurement of the visual powers in general (including the acuteness of the perception of form, of light, and of colors — eidoptometry, photoptometry, and chromatoptometry respectively), of the extent of the visual field (perioptometry), of the accommodative and refractive states of the eye (dioptometry), and of the position and movements of the eyeball. (ophthalmostatometry and ophthalmotropometry).

Measurement of the range of vision, esp. by means of the optometer.

As defined (with minor variations) in the statutes of various States of the United States

“The employment of subjective and objective mechanical means to determine the accomodative and refractive states of the eye and the scope of its function in general.”

“The employment of any means, other than the use of drugs, for the measurement of the powers of vision and adaptation of lenses for the aid thereof.”

the art and science of vision and eye care

the practice of an optometrist