Note 16 — AN ENQUIRY, &c.
Reading edition
Nor is this to be wondered at, considering how few Oculists, if any, are acquainted with Optics; a Science, however, absolutely necessary to investigate the Causes of Defects in Vision. Nay, since curing the Diseases of the Eye became a peculiar Branch of the Medical Art, it is wholly left to Operators, who in general do not know the Functions of the several Parts which constitute the Organ of Seeing, but are even ignorant of its Structure.