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Cataracts may be partial or complete, stationary or progressive, hard or soft. Histologically, the main types of age-related cataracts are nuclear sclerosis, cortical, and posterior subcapsular. [41] Nuclear sclerosis is the most common type of cataract, and involves the central or 'nuclear' part of the lens.
At some point—usually as you enter middle age—most people develop this eye condition, which is a clouding of the eye’s lens that can get progressively worse and impair your vision.
Cataract: A large, powerful waterfall. Multi-step: A series of waterfalls one after another of roughly the same size each with its own sunken plunge pool. Block: Water descends from a relatively wide stream or river. Cascade: Water descends a series of rock steps. Segmented: Distinctly separate flows of water form as it descends.
Cataract surgery is the most common application of lens removal surgery, and is usually associated with lens replacement. It is used to remove the natural lens of the eye when it has developed a cataract, a cloudy area in the lens that causes visual impairment. [4] [10] Cataracts usually develop slowly and can affect one or both eyes. [4]
Waterfalls are sometimes interchangeably referred to as "cascades" and "cataracts", though some sources specify a cataract as being a larger and more powerful waterfall [1] [4] [5] and a cascade as being smaller. [6] A plunge pool is a type of stream pool formed at the bottom of a waterfall. [7] A waterfall may also be referred to as a "foss ...
Congenital cataracts are a lens opacity that is present at birth. Congenital cataracts occur in a broad range of severity. Some lens opacities do not progress and are visually insignificant, others can produce profound visual impairment. Congenital cataracts may be unilateral or bilateral. They can be classified by morphology, presumed or ...
Intraocular lens. An Intraocular lens ( IOL) is a lens implanted in the eye usually as part of a treatment for cataracts or for correcting other vision problems such as short sightedness and long sightedness; a form of refractive surgery. If the natural lens is left in the eye, the IOL is known as phakic, otherwise it is a pseudophakic lens (or ...
The word "cataract" comes from the Greek word καταρρέω ("to flow down"), although the original Greek term was the plural-only Κατάδουποι. However, contrary to this, none of the Nile's six primary cataracts could be accurately described as waterfalls, and given a broader definition, this is the same with many of the minor ...