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  Indian J Med Microbiol
 

Figure 7:-Same case, the scotopic `b' wave is decreased, and the latent period is increased. This would be useful to differentiate patches of conjunctival xerosis due to avitaminosis from those we get sometimes in apparently healthy subjects in whom the ERG is normal.

Figure 7:-Same case, the scotopic `b' wave is decreased, and the latent period is increased. This would be useful to differentiate patches of conjunctival xerosis due to avitaminosis from those we get sometimes in apparently healthy subjects in whom the ERG is normal.