Cataract

A cataract is a congenital or degenerative opacity of the lens. The main symptom is a gradual, painless loss of vision. The diagnosis can be put through an ophthalmoscope or slit lamp examination. Treatment consists of cataract extraction and implantation of an intraocular lens.

A cataract is a congenital or degenerative opacity of the lens. The main symptom is a gradual, painless loss of vision. The diagnosis can be put through an ophthalmoscope or slit lamp examination. Treatment consists of cataract extraction and implantation of an intraocular lens.

(Developmental or congenital cataract congenital cataract.) A cataract is a congenital or degenerative lens opacity. The main symptom is a gradual, painless loss of vision. The diagnosis can be put through an ophthalmoscope or slit lamp examination. Treatment consists of cataract extraction and implantation of an intraocular lens. Cataract is the leading cause of blindness worldwide. In the US, nearly 20% of people aged 65 to 74 have a cataract that affects vision. Almost one in two people who are older than 75 have cataracts. The opacity of the lens can occur in different locations: Central lens nucleus (nuclear cataract) Under the posterior lens capsule (posterior subcapsular cataract) On the side of the lens (cortical cataracts) – these do not affect the central view Etiology The cataract usually occurs with increasing age , Other possible risk factors include the following: Trauma (until years later sometimes causes cataracts) Smoking alcohol consumption exposure to X-rays heat from infrared exposure Systemic diseases (such as diabetes.) Uveitis (inflammation of the choroid) Systemic medications (such as corticosteroids.) Malnutrition chronic exposure to ultraviolet light Many people have no other risk factors than age. A cataract can be congenital and associated with many syndromes and diseases occur. The use of estrogen in postmenopausal women may be protective, but estrogen should not be used alone for this purpose. Symptoms and signs A cataract develops slowly usually over years. Early symptoms include impairment of contrast sensitivity (z. B. Halo and Lichkränze around lights, no photophobia), the need for more light to see well, as well as problems in distinguishing between dark blue and black. Finally painless blurring of vision occurs. The degree of blurred vision depends on the location and extent of turbidity. Double images or ghosting rare. With a nuclear cataract, the distance vision deteriorated. (Editor’s note: myopisierende Kernkatarkt) The near vision can be improved due to changes in the refractive index of the lens at the initial stage; Presbyopia patients may be temporarily able to read without glasses (second sight). A posterior subcapsular cataract lead to a disproportionate visual impairment because the haze is in the hub of the air entering the eye beams. This cataract causes a greater reduction of visual acuity in miosis (z. B. in brightly lit environment, while reading). Moreover, it is the form of cataract, which causes most likely a weakening of the contrast sensitivity and glare sensitivity (halos and starbursts around lights around), in particular by bright light or headlight when driving at night. In rare cases, the cataract swells, pushing the lens through the trabecular mesh drainage and causes occlusion and in this way a secondary angle-closure glaucoma with pain. Cataract Image courtesy of the Department of Ophthalmology of the University Hospital Erlangen-Nuremberg via the Online Journal of Ophthalmology (www.onjoph.com). var model = {thumbnailUrl: ‘/-/media/manual/professional/images/cataract_b_high_de.jpg?la=de&thn=0&mw=350’ imageUrl: ‘/-/media/manual/professional/images/cataract_b_high_de.jpg?la = en & thn = 0 ‘, title:’ cataract ‘, description:’ u003Ca id = “v37894147 ” class = “”anchor “” u003e u003c / a u003e u003cdiv class = “”para “” u003e u003cp u003eDieses picture shows a central core cataract and a peripheral cataract u003c / p u003e u003c / div u003e. ‘credits’ image courtesy of the Department of Ophthalmology of the University hospital Erlangen-Nuremberg via the online Journal of Ophthalmology (www . .onjoph.com) ‘hideCredits: false

Health Life Media Team

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