<prompt> Band shaped keratopathy is formed due to deposition of:CalciumAmyloidIronMelanin  <response>: Ans. a. Calcium Ref: Parsons 20e p202; Yanoffs 2e p449; Kanski 6e p304-305Band shaped keratopathy is essentially a degenerative change associated with deposition of calcium salts in Bowmans membrane, most superficial part of stroma and in deeper layers of epithelium.Band Shaped KeratopathyCalcific band KeratopathyBand shaped keratopathy is essentially a degenerative change associated with deposition of calcium saltsQ in Bowmans membrane, most superficial part of stroma and in deeper layers of epithelium.Causes of Band Shaped KeratopathyIdiopathicChronic Eye Disease MCSystemic Conditions associated with hypercalcemiaLocal corneal damage Idiopathic and age related in otherwise healthy eyes Chronic uveitis: JRA, Sarcoidosis Chronic glaucoma Chronic keratitis Sarcoidosis Hyper-parathyroidism Vitamin D toxicity Extensive metastatic neoplasm to bone Chronic renal failure secondary hyperparathyroidism Intraocular silicon oil Phosphate forms of corticosteroids Comeal PigmentationConditionDeposited MaterialSite of DepositionArgyrosisSilver nitrate AgNO3Brown discoloration of Descemets membraneChalcosis Kayser Fleisher ringCopper CuGrayish-green or golden brown discoloration of stroma of peripheral corneaHudson-Stahli lineElderlyBrown horizontal line in inferior third of corneaKrukenbergs spindleMyopic menVertical spindle shaped brown uveal pigment depositionFleisher ringIron FeEpithelial iron deposits at the base of KeratoconusSiderosisFe hemosiderin Green or brown discoloration of deeper layers of cornea Fleishers ring representing deposition of hemosiderin is found in KeratoconusStockers linePterygium Topical epinephrineUsed for glaucomaResult in black corneaWilsons disease Kayser Fleisher ringCopper CuGreyish green or brown ring is seen just inside the limbus due to Cu deposition between Descemets membrane and endothelium 