Physical Fitness and Well-Being and Eye Care Part 2
About physical fitness, medical information, trivia, anatomy, well-being and care of your eyes.
TAKING A PHYSICAL--HEAD TO TOE
Rods are used mainly for night vision. That is why the world appears monochromatic (black, white, and gray) at night.
Researchers believe there are three kinds of cones, each sensitive to a single color: blue, green, or red. Colors other than these three are perceived by stimulating combinations of these.
When you were born, the messages that came to your brain from your eyes were confusing and meaningless. Months passed before you learned to make sense of them.
The size of your field of vision is different for different colors. White has the largest field, yellow the next largest, then blue, red, and green.
The amount of muscular tension required to focus your eyes is one of the nerve signals by which you judge distance.
The movements of your eyes are controlled by three pairs of muscles, for up and down, side to side, and circular.
The movements of each of your eyes are limited as follows: 35 deg. up, 50 deg. down, 45 deg. out, 50 deg. in.
Blinking is an impulse controlled by your autonomic nervous system. You normally blink your eyes every two to ten seconds.
Eyelashes trigger the blinking impulse when touched.
Your eyeballs receive a constant bathing of salty fluid produced in glands behind your eyelids. Called lacrimal fluid, it lubricates while it cleans. A more romantic word for lacrimal fluid is tears.
Faulty vision is usually corrected in one of three ways: eyeglasses, contact lenses, or eye exercises.
For some people, eye exercises have been found to be effective in correcting vision problems which are related to the eyes' muscular functions. Nearsightedness, farsightedness, and astigmatism are all influenced by muscles, though they can be influenced by other factors too.
The following are books for improving your sight through eye exercise:
1. Bates, W. H. Better Eyesight without Glasses. New York: Holt, 1940.
2. Corbett, M. Help Yourself to Better Sight. Hollywood: Wilshire, 1949.
3. Huxley, Aldous. The Art of Seeing. New York: Harper & Row, 1942.
4. Jackson, Jim. Seeing Yourself See. New York: Dutton, 1975.
Their claims have been disputed by ophthalmologists (physicians who treat the eye).
Practice in coordination between your eyes and the large muscles of your body allows you to perform tasks such as walking, running, and, on the more complex side, hitting a baseball with a bat. Thus, within your brain there is a close interrelationship between signals from your arms, legs, and trunk and signals from your eyes.
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