Alzheimer's disease & dementia

Eye conditions linked to heightened risk of dementia

Age-related macular degeneration, cataract and diabetes-related eye disease are linked to an increased risk of dementia, suggests research published online in the British Journal of Ophthalmology.

Ophthalmology

Cataracts: Common, and easy to treat

(HealthDay)—Many aging Americans can have their vision dimmed by cataracts, but the good news is that they're easily treated, one expert says.

Ophthalmology

New research may revolutionise cataract treatment

World-leading eye experts have made a breakthrough that could potentially change the way cataracts are treated—with potential for drug therapy to replace surgery.

Ophthalmology

Cataract surgery in infancy increases glaucoma risk

Children who undergo cataract surgery as infants have a 22% risk of glaucoma 10 years later, whether or not they receive an intraocular lens implant. The findings come from the National Eye Institute (NEI)-funded Infant Aphakic ...

Ophthalmology

New research on cataract surgery in order to improve health care

In general, surgeons who perform numerous cataract operations every year encounter relatively few severe cases, and this probably contributes to their lower complication rate, as shown by a study led from the University of ...

Ophthalmology

Researchers capture cell-level details of curved cornea

Researchers have, for the first time, acquired optical coherence tomography (OCT) images of the curved layers of a person's cornea with cell-level detail and a large viewing area. The new OCT instrument enables improved monitoring ...

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Cataract

A cataract is a clouding that develops in the crystalline lens of the eye or in its envelope, 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 colours. 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, but 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