The alternate use of both eyes occurs in cases where both eyes have good vision and both eyes can focus on the target, so the two eyes can be used alternately. There may not be any symptoms. The diagnosis of alternate binocularity can be clearly made based on the results of binocular optometry, which examines the aggregation of light rays after they are incident on the eye, and measures the degree of difference in aggregation between the examined eye and the ortho-optic eye using the ortho-optic state as the standard. 1, monocular vision Refractive aberration exceeds a certain level, the monocular function of both eyes is destroyed, in the stage of immature visual development, in order to avoid the interference of blurred object image, will involuntarily take its inhibitory effect, the child is not binocular monocular, but monocular monocular, that is, only use the eye with better vision to see things, the other eye is abandoned, monocular vision without normal depth perception and stereo vision. 2, amblyopia After the formation of monocular vision, the retina of the primary eye is constantly subject to normal visual stimulation, and the visual information is transmitted to the visual center through the visual pathway to form vision, and its visual function can be developed normally, the blurred object and the information generated by the disused eye is suppressed, the visual center does not respond to the visual information of the eye, and amblyopia is formed after a long time, in general, the degree of refractive error in the amblyopic eye is greater than that in the other eye. The degree of amblyopia is related to the age at which the refractive error occurs, and the younger the age, the more severe the degree of amblyopia may be. The development of myopic refractive aberrations occurs later, rarely during the sensitive period of visual function development, and even if myopic refractive aberrations cause amblyopia, the degree is often mild. 3, strabismus Amblyopic eyes are not necessarily accompanied by strabismus, but if the eye’s visual function is suppressed for a long time and abandoned, strabismus is likely to appear. Alternating vision occurs in cases where both eyes have good visual acuity, both eyes can focus on the target, and both eyes can be used alternately. There may not be any symptoms. If the patient looks at a distant object, the light passes through the distant optical area to form a clear image on the retina, while passing through the near optical area to form a non-retinal focus. Conversely, if the patient looks at a near object, the light passes through the proximal optical area to form a clear image on the retina, while the light passing through the distal optical area forms a focus outside the retina, resulting in some blurring always due to defocus. The difference between myopic and hyperopic refractive error: 1. The same visual correction in both eyes is more common in myopic refractive error than in hyperopic refractive error, and unequal visual correction is more common in hyperopic refractive error, and the difference in visual acuity between the two eyes is greater. 2. The visual acuity correction in the better eye decreases as the refractive error increases, and in hyperopic refractive parallax, the decrease is even greater. In myopic refractive error, the corrected visual acuity of the eye decreases with the increase of refractive error, and the gradient of decrease is larger than that of the good eye on the opposite side; in hyperopic refractive error, the visual acuity of the eye decreases rapidly with the increase of refractive error, which is also more rapid than that of the eye in myopic refractive error, 4. The average corrected visual acuity of hyperopic refractive error is worse than that of myopic refractive error. Refractive aberrations and unequal images in both eyes: both exist simultaneously or separately, such as when the refractive aberration correction glasses are placed in the front focal plane of the eye with axial refractive error, the retinal image size will be the same as that obtained with orthoptics (Knapp’s law). In the following cases of refractive error, unequal images are often seen, such as eye swelling, dizziness, visual acuity and even diplopia. Doctors remind: When using computers, in addition to proper rest and activity, it is important to strengthen the protection of the eyes and take appropriate vitamin A and protein supplements. Usually you can drink more tea, tea contains tea polyphenols and other active substances, which is conducive to the absorption and resistance to radioactive substances.