Sense of sight
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This document provides information about vision and eyes. It discusses how the eye is an evolutionary marvel that has developed over 40 times in different species. It then shares 20 facts about human eyes, such as their size remaining constant throughout life, their composition of over 2 million parts, and how 80% of our memories are visual. The document also briefly outlines 15 common eye diseases and conditions like astigmatism, amblyopia, and red eyes. Finally, it recommends eating a nutritious diet, quitting smoking, and taking regular breaks when using digital screens to maintain good eyesight.
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1 - SENSE OF SIGHT.pptx
The sense of sight, also known as vision, is one of the most remarkable and complex sensory systems in the human body. It plays a fundamental role in our daily lives, allowing us to perceive and interpret the world around us. This sense enables us to experience the beauty of a sunset, navigate through a bustling city, and read the words on this page. Our ability to see shapes, colors, and motion provides us with a wealth of information that shapes our understanding of the environment and influences our decisions and actions.
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The document discusses physiology related to human balance and equilibrium. It defines static and dynamic equilibrium and describes the key systems and structures involved in maintaining balance, including the vestibular system, cerebellum, and their interconnections. The cerebellum coordinates movement and balance through three main sections. The vestibular system detects head movement through five receptor organs in each inner ear and sends signals to the brainstem and cerebellum through the vestibular nerve and nuclei.
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Red eye in photographs occurs because light from the flash bounces off the blood vessels in the back of the eye, appearing red in photos. The eye can heal minor scratches within 48 hours. While corneas do not have blood vessels, some other non-living tissues like hair and nails also lack blood. Our eyes are the second most complex organ after the brain, with over two million working parts and the ability to see around 10 million colors.
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This document summarizes several common eye myths. It dispels myths such as reading in dim light or poor vision harming the eyes, holding books or sitting close to the TV being harmful, using eyes too much causing them to weaken, and glasses damaging vision. It also addresses myths about cataracts, contact lenses, eye color inheritance, color blindness, eye transplantation, UV light exposure, diet and vision, sleeping in contacts, eye size at birth, and dry eyes. The document provides factual information to replace each myth.
Interesting facts about eyes
Eyes are organs that detect light and convert it into electro-chemical signals in neurons. Eyes are very sensitive, as a candle can be detected from 1 mile away. Eyes contain over 2 million working parts and are composed of cornea, retina, iris and other structures. Eyes evolve over 500 million years ago and gave early animals an advantage over those without vision. Today, eyes allow humans to see in color and process large amounts of visual information.
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This document provides information about various eye diseases from the National Eye Institute website. It begins with an overview of the anatomy of the eye and lists many common eye diseases. Separate articles then provide more detailed information about cataract, retinal detachment, and corneal disease. For each disease, it discusses symptoms, causes, risk factors and additional resources for more information available on the National Eye Institute website.
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Dr. Liggett is a leader in the evaluation and treatment of macula and retina diseases. He was the founder and president of New England Retina Associates until August of 2013. Dr. Liggett is a nationally renowned educator who is a Clinical Professor of Ophthalmology at both Yale School of Medicine and the Cornell Weill College of Medicine in New York. He taught at Johns Hopkins University, Georgetown University and the Doheny Eye Institute at the University of Southern California.
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The document discusses the anatomy of the eye, including the outer layers like the sclera and cornea, middle layers such as the iris and choroid, and inner retinal layer. It also explains how light enters the eye and is processed, normal vision versus problems like astigmatism and blindness, and the causes and treatments of common vision issues such as cataracts and glaucoma. Color vision is enabled by the three types of cone pigments that are sensitive to different wavelengths of light.
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This document provides information about the eyes and how to take care of them. It begins with an energizer activity and then outlines the main objectives and parts of the eyes like the cornea, iris, pupil, retina and optic nerve. It describes the function of each part. It then discusses seven ways to take care of the eyes like wearing sunglasses, taking breaks from screens, keeping the eyes clean, eating a healthy diet and seeing an eye doctor if vision changes. The document aims to educate students on eye anatomy and promote eye health.
How To Take Care Of Your Eyes
To take care of your eyes, eat a healthy diet rich in omega-3 fatty acids, zinc, and vitamin C. Wear sunglasses and eye protection when outdoors or doing activities that could injure your eyes. Too much screen time can cause eye strain, so be sure to follow the 20-20-20 rule of looking away from screens every 20 minutes. Quit bad habits like rubbing your eyes and see your eye doctor regularly to check for common age-related conditions like cataracts and macular degeneration.
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This document provides information about vision, blindness, and avoidable blindness. It discusses common causes of blindness like cataracts, refractive errors, and diabetic retinopathy. Blindness disproportionately affects those in developing countries and women. Poverty is linked to blindness, as those without means have less access to eye care and are more vulnerable to conditions caused by malnutrition. Restoring sight through low-cost interventions can help lift whole families out of poverty by allowing people to resume work and children to continue their education.
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This document contains a collection of interesting facts organized into several sections. Some key facts include:
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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