You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Band shaped keratopathy is caused by- and explain in detail?
Calcific degeneration (Band Shape keratopathy)Band shape keratopathy (BSK) is essentially adegenerative change associated with deposition ofcalcium salts in Bowman's membrane, most superficialpa of stroma and in deeper layers of epithelium. Etiology  Ocular diseases. Band keratopathy is seen in association with: chronic uveitis in adults, children with Still's disease, phthisis bulbi, chronic glaucoma, chronic keratitis and ocular trauma.  Age related BSK is common and affects otherwise healthy cornea.  Metabolic conditions rarely associated with BSK include hypercalcaemia and chronic renal failure. REF:Comprehensive ophthalmology,4th edition,pg no.116