Gupta, Rachna, Bhavna Sharma, Reena Anand, Shefali Bawaria, and Rajesh Dewada. 2013. “Association of Asthenopia and Convergence Insufficiency in Children With Refractive Error- A Hospital Based Study”. International Journal of Medical Research and Review 1 (5), 222-27. https://doi.org/10.17511/ijmrr.2013.i05.02.