In this clinical trial, a total of 75 presbyopic patients in the age range of 40 to 60 years
old will be participated. The right eyes of 45 patients will be treated by Biocarpine® and
they will be considered as the case group, their left eyes will be defined as the controls.
In another case group, the right eyes of 30 patients will received Vuity® eye drops and their
left eyes will be considered as controls.