A BURNING CLASS IN THE EYE.

Stratford Evening Post, Volume XXXI, Issue 27, 16 September 1911, Page 5

A BURNING CLASS IN THE EYE.

In the front part of each of our eyes is a convex lens of great power and clearness. It acts exactly like a burning glass. If a person was made to look at the sun, say, for half a minute, his eye would actually start to burn up. The lens would focus the rays of the sun on the retina (the hack of the eyeball inside), and that part of the eye would immediately scorch ’ and later would burn to a “crisp.” This can happen, however, only when one looks at the sun directly or in a mirrow. If one holds a pin between the sun and the eye and looks at the pin, although the sun is in a direct line with the eye,- and although its rays are entering the eye, no harm may he done; because the rays are not focussed inside the eyeball. This is the wonderful property the lens lias, that of focusing objects at different distances. The means by which it does this are its power to change its curvature.