inverted only as regards right andleft portions, and is very distinct and vivid with all its natural colors, theexternal light of course being excluded as much as possible from theecreen £. Other forms of the instrument are employed, but they are thegame in principle as the one here described. In… … LECTURE XXIII. THE EYE AXD VISION. 317. The Human Eve is a most perfect and wonderful opticalinstrument. It is globular in form, is placed in a deep bonysocket called the orbit, and is further protected by eyelids, eye-lashes, and an eyebrow. The ball of the eye consists essentiallyof three…
Physics
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