Evening Republican, Volume 21, Number 194, Rensselaer, Jasper County, 1 September 1917 — Eyeglasses for a Diver. [ARTICLE]

Eyeglasses for a Diver.

A new eyeglass has been patented for the use of submarine divers. It is well known that the human eye does not function properly under water, objects appearing badly blurred and distorted. This is due to the fact that the speed of light in Water is different from • the speed of - light in air, and hence the light rays enter the eye with a different angle of refraction. The eye. Being designed for focusing rays coming through the air, is unable to focus rays coming through' the water.