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- W2296038067 abstract "THE role of Vitamin A in the metabolism ofvisual purple has been reported by severalworkers (4, 10, 8, 7). Vitamin A was shownto be a precursor of the visual purple in thepigments of frog's eyes (9). The visual purplesystem uses up vitamin A and is, therefore,dependent on the diet for its replacement (9).The deficiency of Vitamin A will, therefore,cause difficulty or inability to see in dim light.The deficiency of Vitamin A in the human,ystem is associated with a number of eyelesions. In adults and grown-up childrennight-blindness is the first common symptom ofVitamin A deficiency. The second stage of thedisease results in the dryness of the conjuctiva(xerosis). Keratomalacia is an advanced stage inthe eye manifestations of adults as well as infants.This starts with the softening of the cornea andultimately leads to the destruction of the eyeand blindness through secondary infections.The prevalence of such eye diseases is verycommon among people who suffer from malnutrition.Among Japanese children Mori (6)found the incidence of xerophthalmia to bevery high, especially in times of famine.Block (2) reported the occurrence of the samedisease among the poor Danish and attributedit to the general use of skim milk in infant andhild feeding. Similar cases have been reportedin Roumania and Vienna (3). In India, asurvey of Vitamin A deficiency was carried outat Calcutta (1). A similar survey was made bythe author in Lahore (Punjab) in 1945 and thispaper presents the results of the same." @default.
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- W2296038067 date "1953-01-01" @default.
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- W2296038067 title "Studies on vitamin 'A' deficiency." @default.
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