“…Dis turbances of divalent ion and phosphorus metabolism may cause hyperpara thyroidism, osteomalacia, metastatic soft tissue calcification resulting in enor mous unsightly masses growing out of the pelvis or shoulder girdle, metastatic calcific deposits in arteries which can be troublesome in subsequent arterio venous fistula surgery for haemodialysis treatment [Mallick. and Berlyne, 1969], corneal and conjunctival calcification giving rise to 'red eyes' or white painless eyes [Berlyne and Shaw, 1967;Berlyne, 1969] and, in cases with extreme hypocalcaemia, blindness from metabolic cataracts [Berlyne et al, 1971].…”