(1):
(n.) Measurement of the range of vision, esp. by means of the optometer.
(2):
(n.) "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."
(3):
(n.) "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."
(4):
(n.) As defined (with minor variations) in the statutes of various States of the United States:
A timeless resource no serious scholar should be without. With more than 75,000 entries, if it is a word used in the Bible, you are sure to find it defined here.Wikipedia
Read More