Sense of sight

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Information about Sense of sight

Published on January 2, 2016

Author: rajeshsandhu166

Source: slideshare.net

1. SENSE OF SIGHT

2. •The eye is one of the most remarkable achievements of evolution, and has evolved up to 40 times in different parts of the animal kingdom. In humans, vision is the most important sense, and much of the brain is given over to the processing of visual information. Perhaps you are getting bored so here are some facts about our eyes. Listen carefully huh?

3. •We don’t often give our eyes as much thought as we should, that is until something goes wrong and our vision is affected. But when you learn more about eyes, you realize just how amazing they are. Here are a few facts you may enjoy: ( I think so? )

4. FACTS ABOUT EYES 1. Eyes began to develop 550 million years ago. The simplest eyes were patches of photoreceptor protein in single-celled animals. 2. Your eyes start to develop two weeks after you are conceived. 3. The entire length of all the eyelashes shed by a human in their life is over 98 feet with each eye lash having a life span of about 5 months. 4. To protect our eyes they are positioned in a hollowed eye socket, while eyebrows prevent sweat dripping into your eyes and eyelashes keep dirt out of your eyes.

5. FACTS ABOUT EYES 5. Your eyeballs stay the same size from birth to death, while your nose and ears continue to grow. 6. An eye is composed of more than 2 million working parts. 7. Only 1/6 of the human eyeball is exposed. 8. Corneas are the only tissues that don’t have blood. 9. The human eye weights approximately just under an ounce and is about an inch across.

6. FACTS ABOUT EYES 10. An eye cannot be transplanted. More than 1 million nerve fibers connect each eye to the brain and currently we’re not able to reconstruct those connections. 11. 80% of our memories are determined by what we see. 12. Eyes heal quickly. With proper care, it takes only about 48 hours to repair a minor corneal scratch. 13. There are about 39 million people that are blind around the world. 14. 80% of vision problems worldwide are avoidable or even curable.

7. FACTS ABOUT EYES 15. Humans and dogs are the only species known to seek visual cues from another individual’s eyes, and dogs only do this when interacting with humans. 16. A fingerprint has 40 unique characteristics, but an iris has 256, a reason retina scans are increasingly being used for security purposes. 17. People who are blind can see their dreams if they weren’t born blind.

8. FACTS ABOUT EYES 18. “Red eye” occurs in photos because light from the flash bounces off the back of the eye. The choroid is located behind the retina and is rich in blood vessels, which make it appear red on film. 19. 80% of what we learn is through our eyes. 20. Eyes are the second most complex organ after the brain.

9. DISEASES

10. THIS PART MAY BE TOO BORING BUT WE NEED TO BE AWARE OF SUCH DISEASES.

11. ACANTHAMOEBA KERATITIS •A rare but serious eye infection associated with poor contact lens hygiene and other factors.

12. AMBLYOPIA (LAZY EYE) •Is a vision development problem in infants and young children that can lead to permanent vision loss.

13. ASTIGMATISM •Usually caused by an irregular cornea, astigmatism causes blur at all distances.

14. BELL'S PALSY This condition causes sudden paralysis of one side of the face. Because it affects blinking, it can cause severe dry eye.

15. RED EYES - Can be caused by allergies, eye infections and eye injuries.

16. THANK YOU FOR READING (IF EVER) 

17. HOW TO MAINTAIN GOOD EYE SIGHT

18. • 1. Eat for Good Vision • Protecting your eyes starts with the food on your plate. Nutrients such as omega-3 fatty acids, lutein, zinc, and vitamins C and E might help ward off age-related vision problems such as macular degeneration and cataracts, studies show. Regularly eating these foods can help lead to good eye health: • Green, leafy vegetables such as spinach, kale, and collards • Salmon, tuna, and other oily fish • Eggs, nuts, beans, and other non-meat protein sources • Oranges and other citrus fruits or juices

19. 2. Quit Smoking • Smoking makes you more likely to get cataracts, optic nerve damage, and macular degeneration. If you've tried to quit smoking before and started smoking again, keep trying. The more times you try to quit smoking, the more likely you are to succeed. 3. Look Away From the Computer Screen Staring at a computer screen for too long can cause: • Eyestrain • Blurry vision

20. There are many more ways to maintain a good eye sight be the one to

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