Janoff, Lester E. “The Effect of Freeze Thaw Conditions on Hydrogel Lens Posterior Apical Radius and Surface Quality”. Canadian Journal of Optometry 44, no. 4 (December 1, 1982): 2. Accessed November 27, 2024. https://openjournals.uwaterloo.ca/index.php/cjo/article/view/4249.