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Eye Health

Eye Health is the processes and properties of the eye as a whole or of any of its parts.

Recently Answered Questions

What is normal vision?
1 Expert Answer
Most Recent Answer
by HowStuffWorks
Vision (also called visual acuity) is tested by reading an eye chart at a distance of 20 feet. By examining many people, eye doctors have decided what a "normal" human should be able to see when standing 20 feet from an eye chart. If someone has 20/20 vision, that means he can stand 20 feet from the chart and can see what a "normal" human sees. Therefore, if someone has 20/20 vision his vision i...
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How does the eye determine distance?
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by HowStuffWorks
The eye uses three methods for depth perception or determining distance: The size a known object has on the retina - If you know the size of an object from previous experience, your brain gauges the distance based on the size of the object reflected on the retina. Moving parallax - Moving your head from side to side makes close objects move rapidly across your retina. Far away objects, however...
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How does the eye work?
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by Cleveland Clinic
We are able to see by the light rays that are reflected off an object and through the eyeball. These light rays are focused upside-down on the retina where it is converted to electrical impulses and carried to the brain. The brain translates the image into its upright position. Learn more about the working of eye.
What are common refractive vision problems?
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by HowStuffWorks
The most common refractive vision problems are nearsightedness (myopia); farsightedness (hyperopia); astigmatism and presbyopia. In nearsightedness, the image from distant objects gets focused in front of the retina instead of right on it. This happens usually when the eyeball itself is too long; it can also be caused by too much focusing power in the lens system. The result is that the person c...
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What does it mean to have 20/20 vision?
1 Expert Answer
Most Recent Answer
by HowStuffWorks
By looking at many people, eye doctors have decided what a "normal" person should be able to see when standing 20 feet from an eye chart. If you have 20/20 vision, that means you can stand 20 feet from the chart and can see what a "normal" person can see. In other words, your vision is "normal. If you have 20/40 vision that means you can stand 20 feet from a chart and can see what a normal perso...
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How can I get little bumps on my eyelids removed?
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by Cleveland Clinic
Bumps on the eyelids are often related to small deposits of fat/cholesterol in the upper skin layer. They can be removed in an office setting with minimal downtime. Learn more about the removal of little bumps on eyelids.
What are the major causes of vision loss?
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by Dr. Kelly Traver
Every year, 50,000 Americans lose their vision. One third of these cases are preventable through proper lifestyle measures and early detection and treatment. The three major causes of blindness are: Cataracts Macular degeneration Glaucoma
What causes cataracts and how are they treated?
3 Expert Answers
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by Michael T. Murray
Aging-related (senile) cataracts form when the normal protective mechanisms of the eye are unable to prevent free-radical damage. The lens, like many other tissues of the body, depends on adequate levels and activities of antioxidant nutrients and enzymes for its normal protective mechanisms. When it is either overwhelmed by the demand for or deficient in the supply of antioxidant nutrient and en...
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Why does macular degeneration in the eye occur with age?
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Most Recent Answer
by Dr. Kelly Traver
Macular degeneration is a condition in which the area of the retina involved in central vision, the macula, degenerates. Macular degeneration is the leading cause of blindness in people over age 55. Too much direct sunlight can accelerate the process. The retina is fed by small blood vessels, so conditions that cause arterial damage, such as high blood pressure, high cholesterol, smoking, and dia...
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What is glaucoma and what can I do to prevent it?
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Most Recent Answer
by Dr. Sreedhar Potarazu
Glaucoma is a condition wherby the pressure within the eye is increased and can cause damage to the optic nerve and nerve fibers. There are different causes of glaucoma that can cause the pressure to be increased. The most common-type of glaucoma called "open-angle" glaucoma can run in families. There is no means of preventing glaucoma, but those with a family history should have annual checkups ...
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