Doganay, S., H. Er, C. Evereklioglu, A. Erten, and M. Borazan. “The Effectiveness Of The Pinhole Method For Visual Acuity Evaluation”. Annals of Medical Research, vol. 9, no. 2, May 2021, pp. 0113-4, https://www.annalsmedres.org/index.php/aomr/article/view/2904.