The eye
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The document summarizes key aspects of eye anatomy and vision conditions like hyperopia and myopia. It describes the layers of the eye, how light passes through and focuses on the retina. Hyperopia and myopia occur when the eye is too short or the lens cannot focus properly, leading to blurred vision. Current solutions include contacts, glasses, and Lasik surgery. The document proposes a new treatment using eye drops containing sodium chloride and water, which would use osmosis to temporarily shrink the eye and reduce nearsightedness.
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The cornea covers the front of the eye like clear glass and has no blood vessels. Behind it is the iris, which is the colored part that controls the size of the pupil, the hole that lets light into the eye. Light passes through the pupil and is focused by the lens onto the retina, which acts like a screen to show the image being seen and transmits it through the optic nerve.
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Presbyopia is an age-related condition where the eye's ability to focus on near objects progressively diminishes. It is caused by a loss of elasticity in the crystalline lens as one ages. The first signs are difficulty reading or doing close work, especially in low light, as images blur closer than 25cm from the eyes. Examination shows normal eyes and refraction reveals the need for a near vision correction, usually +1 to +2.5 added to any existing prescription for distance. Treatment involves using bifocal or two pairs of glasses, one for distance and one with a near prescription added.
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Abc's of vision impairments and communication styles
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Abc's of vision impairments and communication styles
Abc's of vision impairments and communication styles
Abc's of vision impairments and communication styles
Abc's of vision impairments and communication styles
ABC's of vision impairments and communication styles
ABC's of vision impairments and communication styles
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The document discusses the anatomy and physiology of the eye, common eye disorders like refractive errors, conjunctivitis, cataract and glaucoma. It explains that refractive errors occur when the eye does not refract or bend light correctly, causing blurred vision. The three main types are myopia, hyperopia and astigmatism. Yoga practices like eye exercises, pranayama, certain asanas and general lifestyle recommendations can help treat minor eye issues and provide stress relief for conditions like glaucoma.
HUMAN EYE AND ITS DEFECTS
The human eye allows us to see the world through refraction of light. It contains structures like the cornea, iris, pupil, lens, retina and optic nerve. Light enters through the cornea and passes through the pupil, where it is focused by the lens onto the retina. The retina contains light-sensitive cells that generate signals sent to the brain via the optic nerve, allowing us to see. The lens adjusts its curvature for accommodation to focus on near or far objects. Defects in refraction can cause issues like myopia, hyperopia or presbyopia later in life.
(Modified)Sense of sight (structure of the eye.pptx)
The document provides information about the anatomy and structure of the eye, how vision works, common eye conditions such as cataracts and glaucoma, and tips for eye care including eating a healthy diet, wearing protective eyewear, and exercising your eyes. It describes the parts of the eye like the cornea, iris, pupil, lens, retina, and optic nerve and how light enters the eye and is focused onto the retina to allow vision. Common eye defects and diseases addressed include myopia, hyperopia, astigmatism, conjunctivitis, and styes.
The Human Eye
The eye is one of the most complex parts of the body, allowing humans to perceive their environment through light, color, depth and detail. It consists of several main parts working together, including the cornea, iris, pupil, lens, retina, vitreous humor and optic nerve. Conditions like astigmatism, conjunctivitis and macular degeneration can impact vision if left untreated. The eye's intricate design allows for focused, clear sight.
Refraction
This is a slide show presentation I prepared for the Technical Support staff at Topcon Medical Systems to introduce and familiarize the art of refraction.
CATARACTS.pptx
Cataract is a clouding of the normally clear lens of the eye which can lead to vision loss. It is very common in older people. The document discusses what cataracts are, types of cataracts, causes, symptoms, risk factors, diagnosis, treatment which is usually surgery to remove the clouded lens and replace it with an artificial lens, complications, prevention and why cataracts are so prevalent in India. It also includes a case study of a 70 year old widow who underwent cataract surgery.
Sense of sight (structure of the eye.pptx)
The document provides information about the structure and function of the eye, common eye conditions such as cataracts and glaucoma, and tips for eye care including eating a healthy diet, wearing protective eyewear, and taking breaks when looking at screens. It also identifies parts of the eye like the cornea, iris, and retina and describes how vision works through the reflection of light off objects and the processing of images in the brain.
Reffraction myopia by Dr Abdul Basir safi eye surgeon from Afghanistan
This document discusses refractive errors and myopia. It begins by defining refractive media and refraction. It then discusses the different types of refractive errors including myopia. For myopia, it discusses the etiology, classification, clinical presentation, complications and management. It notes that the main causes of myopia are excessive axial elongation of the eye or increased curvature of the cornea or lens. The main types of myopia are axial myopia, refractive myopia, and curvature or index myopia. Management options for myopia include glasses, contact lenses, and refractive surgery procedures.
Cycloplegic refraction.pptx
Cycloplegic refraction involves using eye drops to paralyze the focusing muscles of the eye in order to get a more accurate measurement of a person's refractive error without influence from accommodation. It is particularly useful for children, people with hyperopia or esotropia, those with presbyopia symptoms at a young age, and for evaluating candidates for refractive surgery. While the drops cause temporary blurry vision and light sensitivity, they allow the full refractive error to be determined and properly corrected.
Refractive ERRORS
This document discusses different types of refractive errors of the eye including myopia, hyperopia, and astigmatism. It explains the causes and symptoms of each condition and how they are corrected either with lenses or surgery. It also provides information on homeopathic remedies that may help treat some refractive errors like myopia when accompanied by certain symptoms.
Human eye
The human eye consists of several main parts that work together to allow vision. The sclera protects the inner parts, while the cornea and lens refract light to focus images onto the retina. The iris controls the pupil size to regulate light levels. The crystalline lens, assisted by ciliary muscles and vitreous humour, allows the eye to focus on near and far objects. The retina converts light images to neural signals sent through the optic nerve to the brain for interpretation. Common vision problems include myopia, hypermetropia, and presbyopia, which can often be corrected using lenses tailored for each condition.
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The eye
- 2. Biomedical Engineering “The Eye” By: Spokane Valley “Shock”
- 3. About the eye The eye has an outer protecting layer called the sclera. The light passes through the sclera, cornea, iris, and finally through the lens. It then focuses on the retina.
- 4. A diagram to help you visualize… www.clipart.com/human_eye_models
- 5. A diagram to help you visualize… www.clipart.com/human_eye_models
- 6. Hyperopia Hyperopia, also known as farsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves toward the eye, the eye must increase its optical power to keep the image in focus on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred because the image is focused behind the retina.
- 7. Myopia (nearsightedness) Myopia is a condition in which the retina is too great a distance from the lens, or the lens can’t flatten enough to focus on the retina. The result is a blurred image due to focusing of the image in front of the retina.
- 8. The Cure for Hyperopia/ Myopia Is...
- 10. Okay We were kidding…
- 11. Who is working on myopia??? A man named Steve Gallop (http://www.gallopinto vision.com) is an eye doctor that lives in Philadelphia, Pennsylvania. He has been researching myopia for 22 years (but during that time he came up with NOTHING to cure myopia).
- 12. Current Market Solutions Contact Lenses Lasik Surgery Glasses
- 13. Our Solution (for Myopia) • Our proposed treatment is a mixture of Sodium Chloride, water, and lidocaine used as eye drops (NaCl H2O).
- 14. How it works... Osmosis • http://www.youtube.com/ watch? feature=player_detailpage& v=sdiJtDRJQEc
- 15. What it does... • When dropped into an eye, NaCl H2O shrinks/takes moister out of the eye. Therefore, it makes the eye smaller TEMPORARILY. The amount that the eye would shrink would vary based on the concentration of the salt.
- 16. Reason... We thought that our decision would be better because people don’t like wearing glasses everywhere, contacts are a pain to put in/take out, and lasik surgery scares people(The whole “Hot light burning your eyes/cutting your eye open” idea).
- 17. The End
Editor's Notes
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