Optometry

The employment of subjective and objective mechanical means to determine the accommodative and refractive states of the eye and the scope of its functions in general; the employment of any means, other than the use of drugs, for the measurement of the powers or range of human vision and the adaptation of lenses or frames for the aid thereof; measurement of the powers of vision in general, as acuteness, of perception of form and color or the extent of the field. 280 Ill. 21.