or VISION. See ANATOMY, no 142, and Index subjoined to OPTICS.

Imperfection of Sight with regard to Colours. Under the article Colours, is given an instance of a strange deficiency of sight in some people who could not distinguish between the different colours. In the Phil. Transf. Vol. LXVIII. p. 611, we have an account of a gentleman who could not distinguish a claret colour from black. These imperfections are totally unaccountable from anything we yet know concerning the nature of this sense.

Second Sight. See SECOND SIGHT.