<prompt> What is deposited in band keratopathy-CaSO4CaPO4MgSO4MgPO4  <response>: Ans. is b i.e., CaPO4 Band Keratopathy Band keratopathy is characterized by the deposition of calcium and phosphorus salts especially hydroxyapatite in a band-like pattern in the anterior layers of the cornea. The keratopathy is usually limited to the interpalpebral area. Symptoms include irritation, injection, and blurring of vision. Causes of band keratopathy are:i Idiopathic and age relatedii Chronic eye diseases most common causeChronic Uveitis like JRA sarcoidosis; chronic glaucoma; chronic keratitis.iii Conditions associated with hypercalcemia : - Sarcoidosis, Hyperparathyroidism, Vitamin D intoxication, metastatic neoplasm to bone, CRF secondary hyperparathyroidism.iv Local corneal damage : - Intraocular silican IOL. 