(a) a method of finding out by refraction whether an eye is myopic or hypermetropic; (b) a method of examining the outer side of an eye affected with…

Landolt's name for the ‘shadow-test’ for the refraction of the eye.

a test for colour-blindness in which the subject is asked to name or match colours shown by a lantern.

Used attributively and in the possessive with reference to a test for colour-blindness based on the use of pseudo-isochromatic plates.