In this function, y is the dependent variable and x is the independent variable. Variable used in an experiment or modelling can be divided into three types:  dependent variable ,  independent variable , or other.
About 70% of men have an eye dominance that matches their handedness. BUT, 30% do not. Most right handers have a dominant right eye and the bulk of southpaws a dominant left. These are the people who are well advised to shoot both eyes open (assuming that they are shooting from their strong shoulder).
Monovision refers to the method of correcting one eye for distance and the other for near vision. Usually a person's dominant eye is corrected for distance and tests can be done in office to determine which eye is the dominant one. There are several advantages and disadvantages to this method of correction.