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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. This eventually becomes hard, or ...
Unilateral VS plus any two of meningioma, glioma, neurofibroma, schwannoma, posterior subcapsular lenticular opacities; Two or more meningioma plus unilateral VS or any two of glioma, schwannoma and cataract. Another set of diagnostic criteria is the following: [citation needed] Detection of bilateral acoustic neuroma by imaging-procedures
Ophthalmological findings in affected individuals include constricted visual fields, posterior subcapsular cataracts (can begin in late teens), elevated dark adaptation thresholds and decreased or absent electroretinographic responses. [3]
DM causes muscle weakness, early onset of cataracts, and myotonia, which is delayed relaxation of muscles after contraction. [5] Cataracts can be either a cortical cataract with a blue dot appearance, or a posterior subcapsular cataract. [6] Other organs affected include the heart, lungs, gastrointestinal tract, skin, and brain. [5]
Posterior capsular rupture, a tear in the posterior capsule of the natural lens, is the most-common complication during cataract surgery. [8] Posterior capsule rupture can cause lens fragments to be retained, corneal oedema, and cystoid macular oedema ; it is also associated with increased risk of endophthalmitis and retinal detachment.
Posterior chamber IOL (PCIOL). This is by far the most common type of implanted lens after cataract surgery, as this is the natural and optimum position for a lens. [citation needed] Anterior chamber IOL (ACIOL). A less-common type of intraocular lens, which is sometimes used if a PCIOL is not an option for a patient or if the situation ...
Months or years after the cataract operation, the remaining posterior lens capsule can become opaque and vision will be reduced in about 20–25% of eyes. [4] This is known as posterior capsule opacification (PCO). PCO is best treated by posterior capsulotomy using YAG laser. [4]
The lens capsule is a transparent membrane that surrounds the entire lens. The capsule is thinnest at the posterior pole with approximate thickness of 3.5μm. Average thickness at the equator is 7μm. [7] [10] Anterior pole thickness increases with age from 11-15μm.