Distant or near vision allows alternate selection of vision through different areas of the pupil. Alternating vision occurs in cases where both eyes have good visual acuity and both eyes can focus on the target, alternating the use of both eyes. The prevention of alternate eye use is What is the prevention of alternate eye use? Previous studies have found that the visual system in humans and mammals is able to adjust and change innate neural connections and synaptic structures after birth in response to environmental stimuli. The most sensitive period during which these changes occur is called the critical period of plasticity in visual development. During the critical period of plasticity, the abnormal visual environment can cause dysfunction, but after removing the abnormal visual environment, the development of visual cells can still return to a normal state. When the critical period of plasticity is terminated, the effect of the visual environment on the development of visual pathways and visual functions during the critical period is irreversible. Therefore, it is difficult to improve visual function in adolescents and adults with amblyopia. Studies have shown that amblyopia is a developmental disorder, and most of its occurrence is related to refractive error, especially hyperopic refractive error. School-age children are at a sensitive stage of binocular visual development and are highly susceptible to amblyopia. Studies have shown that the earlier the age of amblyopia treatment onset, the better the binocular vision recovery, and the binocular visual function of amblyopic children is negatively correlated with the age of treatment onset. The sensitive period of binocular vision development begins in the first few months of life and peaks between the ages of 1 and 3 years. Therefore, if the visual system lacks effective stimulation during the sensitive period of visual development, especially during the critical period, not only will the patient have low visual acuity, but more importantly, it can affect the formation of binocular vision. In addition to normal physiological factors, the establishment and improvement of binocular vision requires a normal binocular visual environment, stimulation, and the accumulation of certain visual experiences during the sensitive period of visual development. If amblyopia is treated in a timely manner during the sensitive period, it will help the recovery and development of binocular vision and lead to higher stereo visual acuity; if the sensitive period is exceeded, it may lead to irreversible loss of binocular vision.