Cataract surgery lessens patients' dizziness

Older people with visual impairment can report feeling dizzy and falling. A new study found that after routine cataract surgery, the improved vision led to patients experiencing significantly less dizziness, although they ...

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Curing cataracts without surgery?

Cataracts are very common. The Centers for Disease Control and Prevention estimates that 20.5 million Americans age 40 and over have them. Cataracts slowly cloud your vision, and people struggling with them say it's like ...

Nov 16, 2015
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Researcher explores the science of aging

The longest-lived human on record didn't make it much past 120 years. That's nothing compared to the ocean quahog, a fist-sized clam found off the coast of Maine. "They can live 500 years or longer," says Steven Austad, Ph.D., ...

Sep 24, 2015
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A rare condition of excruciating eye pain

Razor blades. Jabbing needles. Barbed wire. Screaming, howling, red-hot-poker-in-the-eye pain. The impulse to gouge your own eyes out or overdose on sleeping pills – anything to make the pain go away.

Sep 08, 2015
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Cataract risk up for statin users with type 2 diabetes

(HealthDay) -- Statin use, which is substantially higher in patients with type 2 diabetes, correlates with an increased risk of age-related (AR) cataracts, according to a study published in the August issue of Optometry and ...

Aug 13, 2012
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A cataract is a clouding that develops in the crystalline lens of the eye or in its envelope (lens capsule), varying in degree from slight to complete opacity and obstructing the passage of light. Early in the development of age-related cataract, the power of the lens may be increased, causing near-sightedness (myopia), and the gradual yellowing and opacification of the lens may reduce the perception of blue colors. Cataracts typically progress slowly to cause vision loss, and are potentially blinding if untreated. The condition usually affects both eyes, but almost always one eye is affected earlier than the other.

A senile cataract, occurring in the elderly, is characterized by an initial opacity in the lens, subsequent swelling of the lens and final shrinkage with complete loss of transparency. Moreover, with time the cataract cortex liquefies to form a milky white fluid in a Morgagnian cataract, which can cause severe inflammation if the lens capsule ruptures and leaks. Untreated, the cataract can cause phacomorphic glaucoma. Very advanced cataracts with weak zonules are liable to dislocation anteriorly or posteriorly. Such spontaneous posterior dislocations (akin to the historical surgical procedure of couching) in ancient times were regarded as a blessing from the heavens, because some perception of light was restored in the cataractous patients.

Some children develop cataracts, called congenital cataracts, before or just after birth; these are usually dealt with in a different way to cataracts in adults.

Cataract derives from the Latin cataracta meaning "waterfall" and that from the Greek καταράκτης (kataraktēs) or καταρράκτης (katarrhaktēs), "down-rushing", from καταράσσω (katarassō) meaning "to dash down" (from kata-, "down"; arassein, "to strike, dash"). As rapidly running water turns white, the term may later have been used metaphorically to describe the similar appearance of mature ocular opacities. In Latin, cataracta had the alternate meaning "portcullis" and it is possible that the name passed through French to form the English meaning "eye disease" (early 15c.), on the notion of "obstruction". Early Persian physicians called the term nazul-i-ah, or "descent of the water"—vulgarised into waterfall disease or cataract—believing such blindness to be caused by an outpouring of corrupt humour into the eye.

This text uses material from Wikipedia licensed under CC BY-SA

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