?Objective To investigate the accommodation reflex time of eyes among young men.Methods The experiment was designed for subjects to watch distant visual target (5?m) at first and being changed to watch near visual target (0.3?m) then through the displaying program changing of optotype on a monitor.During the period of experiment,the parameters for the size,displaying program and lasting duration of target were controlled via a computer with regulatable function.Results The reflex time of accommodation for three groups of subjects with different...