Variation of accommodative and vergence responses with viewing at near addition lenses in three near viewing distances.

1Assistant Professor, Department of Optometry, Zahedan University of Medical Sciences, Zahedan, Iran. 2Assistant Professor, Department of Optometry, Mashhad University of Medical Sciences, Mashhad, Iran. 3Assistant Professor, Department of Health, Zahedan University of Medical Sciences, Zahedan, Iran. 4BSc in Optometry. ___________________________________________________________________________ Abstract