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A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision of the eye. [1] [7] Cataracts often develop slowly and can affect one or both eyes. [1] Symptoms may include faded colours, blurry or double vision, halos around light, trouble with bright lights, and difficulty seeing at night. [1]
The slit of light can accentuate features of the eye when directed at an angle. The microscope used in combination with the slit lamp allows for greater magnification (10 - 25 times) than typical handheld devices. Like symptoms, glassblowers cataracts can also be diagnosed the same way as cataracts not associated with glassblowing.
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As of 2023, the cataract-surgery rate in South Africa is less than half of the estimated requirement of at least 2,000 per million population per year needed to eliminate cataract blindness. [ 19 ] [ 20 ] In 2011, Lecuona and Cook identified an inadequate level of human resources in the public sector to provide care for the indigent population ...
Carotenoids lutein and zeaxanthin, found in the yolk of chicken eggs, have been shown to reduce the risk of cataracts and macular degeneration, the leading causes of blindness in people 55 and older.
"Couching for cataract"; Wellcome Collection illustration of Indian doctors performing the technique. Couching is the earliest documented form of cataract surgery. It involves dislodging the lens of the eye, thus removing the cloudiness caused by the cataract. Couching was a precursor to modern cataract surgery and pars plana vitrectomy.
Due to the fact that moon is farther away from Earth, it appears smaller than the sun and does not entirely cover the sun. As a result, the moon appears as a dark disk on top of a larger bright ...
Short-term over-exposure can cause snow blindness, which is analogous to sunburn of the cornea, or can cause solar retinopathy, which is long-lasting retinal damage and vision impairment from sungazing. [52] [53] Frequent exposure to the sun can cause yellow non-cancerous bumps on the middle part of the sclera of the eye, called pingueculae. It ...
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