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Updated: May 11, 2025
These are made by a gland-sponge up under the upper lid, so as to wash any dust or sand or other harmful speck out of the eye before it can hurt the sensitive eyeball. Now look at some one's eyeball. It is like the picture, isn't it? bright white around the edge and then a ring of color, brown or blue or gray; and inside the color-ring, or iris, a little round black hole that we call the pupil.
The iris, or color-ring, acts like a curtain, like the ring-shutter of a camera, and closes up the hole, or pupil, when the light is too bright and would dazzle or burn the inside of the eye; but when the light is dim, the iris opens again, so as to let in light enough with which to see. Look at the little window in your kitten's eyes.
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