We investigated the beneficial of near vision prescription using dynamic analysis of refraction under binocular vision. We dynamically measured the refraction during fixing 5 m target for 1 second and then fixing 40 cm target for 6 seconds using a prototype binocular open-view wavefront sensor (TOPCON Corp.) under full-correction lenses for 12 subjects with initial presbyopia (42 to 49 years). Similar measurements were carried out under added 0.5 D each from 0 D to 2 D. The additions were judged from accommodative lag, coefficient of variance, and return of refraction. Comparing those additions with the subjective near vision prescription value, 10 out of 12 cases resulted in deviation of prescription value within ±0.5 D. For excepted two cases, there were two possibilities that the depth of focus was increased by small pupil because of eyelids, and difficulty to keep accommodation for a long time. In this study, we could obtain reference values for near vision prescription which is close to subjective value by objective measurement under binocular vision for cases of early presbyopia. Further investigation of the pupil diameter is necessary in the future.