The two human eyes are not simply a superposition of monocular vision, but a complex task based on binocular regulation and motor function in order to provide a good stereo visual perception. The examination of eye regulation and motor function is called binocular visual function examination, which includes NRA, PRA, BCC, convergence and dispersion ability measurement and many other examinations. Internationally, “binocular vision function examination” has become an important part of optometry. We believe that your prescription may be inaccurate if you do not have a binocular vision function test. Why do I need a binocular vision test? We know that the result of optometry is the refractive state of the eye at that time, generally can meet the optometric distance when seeing things clearly, but in normal life and work, we want to see objects at different distances, need to adjust, convergence and dispersion – that is, binocular visual function involved. The main test of binocular vision function is the adjustment and dispersion function of both eyes, the fusion function of both eyes, adjustment abnormalities and eye movement function, and according to the results of reasonable correction, reasonable wearing glasses, reasonable training, and effectively solve the problem of rapid myopia deepening caused by abnormal binocular vision function. Even for the same refraction, different states of binocular vision require different correction methods. Without checking binocular vision function, the prescription may not be accurate. Good binocular vision not only allows for clear vision at a distance, but also for continuous comfortable reading. If there are defects and disorders in binocular vision, it will cause diplopia, amblyopia, strabismus, suppression, loss of stereo vision, and visual fatigue, which cannot be scientifically detected by traditional optometry alone. The binocular visual function examination can accurately identify the problem and treat it symptomatically, and the physician can make an analysis based on the specific conditions of the eyes to help patients suffering from visual problems improve the quality of vision and slow down the rapid growth of myopia.