What is lamellar cataract?
What is lamellar cataract?
Lamellar or zonular cataract is a hereditary cataract that is transmitted in an autosomal dominant mode. The crystalline opacities are located at the level of the primary fibers in the embryonic nucleus. This cataract is usually bilateral and asymmetrical.
What causes Zonular cataract?
This is a non-syndromal cataract disorder and no systemic disease has been associated. This type of congenital cataract may be caused by mutations in the heat-shock transcription factor-4 gene (HSF4) located at 16q21-q22. 1. It is inherited in an autosomal dominant pattern.
What is a Christmas tree cataract?
A Christmas tree cataract is a rare age-related change resulting from accelerated breakdown of membrane-associated denatured proteins induced by elevated calcium levels.
What causes Snowflake cataracts?
A snowflake type cataract is not very common and is associated with diabetes. It is derived from the fact that the lens looks like white opacities reminiscent of snowflakes. Snowflake cataracts can also occur in non-diabetics too, although very uncommonly. There is no known cause of these types of cataracts.
What causes anterior polar cataract?
May present as a congenital (autosomal dominantly inherited) or acquired cataract secondary to uveitis or trauma (associated with anterior subcapsular opacities).
What is total cataract?
a cataract involving the entire lens.
What do zonular fibers do?
The zonular fibers anchor the the equator of the lens and adjacent anterior and posterior surface of the lens to the ciliary body and and ciliary part of the retina. The zonular fibers are seprataed by interstices (zonular spaces) with aqueous humor.
What is zonular weakness?
Zonular weakness can be caused by disease or trauma, and its presence can make cataract surgery more challenging. Fortunately, there are adjunctive devices to effectively manage it and achieve successful outcomes. Causes. Certain diseases of the eye are associated with zonular weakness or insufficiency.
What does a Christmas tree cataract look like?
The Christmas tree cataract’s classic presentation includes small needle-like, multicolored crystals within the deep cortex of the crystalline lens (Figure). These refractile opacities can be found in a variety of colors, including red, green (hence the name), blue, pink, and gold.
What is a sunflower cataract?
a cataract caused by excessive intraocular copper. Synonym(s): copper cataract, sunflower cataract. A descriptive term for the radiating orange-tinted anterior capsular and subcapsular opacities in the lens due to copper deposition, seen in adolescents with Wilson’s disease; vision is unaffected.
How quickly do cataracts deteriorate?
Most age-related cataracts can progress gradually over a period of years. It is not possible to predict exactly how fast cataracts will develop in any given person. Some cataracts, especially in younger people and people with diabetes, may progress rapidly over a short time.
Can cataracts be cured without surgery?
No, you cannot reverse cataracts without surgery. Currently, there is no non-surgical cure for cataracts that have been approved by the Food and Drug Administration or other government body medical procedure regulators.
When do you get lamellar / zonular cataract?
Lamellar/Zonular cataract. This type of cataract is bilateral. It can be congenital or it can be acquired during the first years of life due to tetany or rickets. The cataract is always large enough to occlude the pupil. Its effect on vision depends primarily on the density of its components – especially the nucleus.
What is the lamellar pattern of autosomal dominant cataract?
The lamellar pattern consists of a zone of opacification around a clear embryonic nucleus. There may be considerable difference in the rate of progression of the opacities among patients and even between the two eyes. This may be among the most common type of congenital, autosomal dominant cataract.
What are the opacities of a lamellar eye?
However, the entire nucleus may be opaque as well. Zonular and posterior subcapsular opacities may appear later but there is considerable variation among patients and they may also appear in a stellate pattern. The lamellar pattern consists of a zone of opacification around a clear embryonic nucleus.
Are there any autosomal dominantly inherited cataract opacities?
Other forms of autosomal dominantly inherited, congenital, progressive lens opacities include congenital cerulean ( 115660, 601547, 608983, 610202 ), Volkmann type ( 115665 ), Coppock-like ( 604307 ), and congenital posterior polar ( 116600) cataracts.
