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Cataracts are most commonly due to aging but may also occur due to trauma or radiation exposure, be present from birth, or occur following eye surgery for other problems. [ 1 ] [ 4 ] Risk factors include diabetes , longstanding use of corticosteroid medication, smoking tobacco , prolonged exposure to sunlight , and alcohol . [ 1 ]
One cause of cataracts is exposure to ultraviolet light. Provided the level of UV emission from lamps is within safe limits, and the lamp a sufficient distance away from the individual, there should be no increased risk of developing cataracts. Photophobia is a symptom of excessive sensitivity to light which affects 5 to 20% of the population ...
The primary causes include post-cataract surgery, certain medications, and, less commonly, neurological or ophthalmological conditions. Post-cataract surgery is a common cause, as replacing the natural lens with a synthetic one increases exposure to blue light, leading to temporary blue-tinted vision. This effect usually resolves as the eye adapts.
VKC is thought to be an allergic disorder in which IgE mediated mechanism play a role. Such patients often give family history of other atopic diseases such as hay fever , asthma or eczema , and their peripheral blood shows eosinophilia and increased serum IgE levels.
Anti-allergic agents are medications used to treat allergic reactions. Anti-allergic agents have existed since 3000 B.C in countries such as China and Egypt . It was not until 1933 when antihistamines, the first type of anti-allergic agents, were developed. [ 1 ]
Eye disorders (e.g., cataracts, progressive retinal atrophy) Blood disorders (e.g., von Willebrand disease) Brachycephalic syndrome (respiratory issues in flat-faced breeds)