Evening Republican, Volume 14, Number 35, Rensselaer, Jasper County, 10 February 1910 — Peculiar Optical Effects. [ARTICLE]

Peculiar Optical Effects.

If one places a pinhead up close to the eye and directly in front of it the head of the pin appears transparent and things may be seen as easily through it as through a sheet of isinglass, the head appearing simply as a large round cloud. If it is placed somewhat closer no pin or head can be seen at all. If one goes into a very dark room and puts a lighted candle near the side of one eye very pretty and peculiar effects are observed. A tracery, forming a regular network, can be easily detected, and this is merely the shadow thrown by the candle on the retina of the eye df the small capillary blood vessels between the retina and the candle. If one looks to the side of a dim star tn the heavens the star Appears a great deal brighter than direct vision makes it appear. This is because the light in the Indirect view falls on what is known as the '“yellow spot” or point of keenest vision. As this is not put directly behind the front of the eye the side glance is necessary. Some people can see stars that way that they cannot perceive at all on direct vision.— Pittsburg Dispatch.