LIGHT. THE EYE. 19 We need to protect the lenses with a cover. Besides the eyelash, the eye also has a cover in the eyelid, which involuntarily descends and ascends so quickly as not to obscure our sight. It is the “twinkling of the eye ” we read of in scripture, and is much shorter than a moment.… … The Human Eye. The front part of the eye, called the cornea (/), is let into the sclerotic coat, or white of the eye (a) ; behind the cornea is the iris (it), which is the part that gives colour to the eye. At the back of the iris is the crystalline lens (kk). * Writers on science often speak of…
Light · Color · Optical illusions · Optics
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