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Cataracts : overview

Cataracts, a leading cause of visual impairment globally, are characterized by the clouding of the eye's natural lens. Situated behind the iris and the pupil, this lens plays a crucial role in focusing light onto the retina, enabling clear vision. As cataracts develop, they impede this light, leading to an array of visual symptoms. The progression is typically slow, often likened to the gradual fogging of a clear window. From blurred vision to difficulties in low-light conditions, the symptoms can range in severity and type. While ageing remains the primary risk factor, other elements like diabetes, prolonged UV exposure, and certain medications can also contribute.


TopicInformation
DefinitionA cataract is a clouding of the natural intraocular crystalline lens that focuses light entering the eye onto the retina.
Aetiology♦ Ageing most common cause in people > 60
♦ Trauma: injuries, past surgery
♦ Eye diseases including chronic anterior uveitis, acute congestive angle closure glaucoma , high myopia and various syndromes like retinitis pigmentosa and Stickley syndrome
♦ Systemic conditions like diabetes , myotonic dystrophy and neurofibromatosis type 2
♦ Congenital : some children are born with cataracts or develop them early

Risk Factors1. Age: About 90% of people...

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