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Band-Shaped Keratopathy.



Calcium deposits as a horizontal band and begins near the corneal periphery at 3 and 9 'o' clock positions.

As the deposits move centrally, the band has clear void circles where Bowman’s layer is penetrated by corneal nerve endings.


Location: Epithelial basement membrane, basal epithelium, Bowman's layer & Anterior stroma.


Causes: elevated serum calcium or phosphate in systemic diseases, including sarcoidosis, hyperparathyroidism, vitamin D toxicity, metastatic neoplasm to bone, and chronic renal failure with secondary hyperparathyroidism, Chronic uveitis.


Treatment:

- Removing epithelium over the deposits, applying 0.05mol/L disodium EDTA acid to chelate the calcium and dissolve it.

- Excimer laser PTK.


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