INS and type 1 diabetes mellitus: Therefore, optometric data could be compared between “pre” and “post” values after lunch and insulin injection, which is usually done in many patients with diabetes type I. Consistent with previous studies [10,11,12,13] we have found refraction to undergo a hyperopic change after normalization of blood sugar levels, and agreed that a decrease in blood glucose cause a diminution of myopia refraction, as we can see in Table 1 with the myopic change in right and left eye.