What is amblyopia? Amblyopia is a loss of best-corrected visual acuity in one or both eyes due to abnormal visual experiences during visual development, with no organic lesions on ocular examination. Amblyopia diagnosis: The diagnosis of amblyopia should pay attention to the age factor. That is, the diagnosis of amblyopia should refer to the lower limit of normal visual acuity in children of different ages. The difference in best corrected visual acuity between the two eyes is 2 lines or more, and the worse eye is amblyopic. If a young child’s visual acuity is not lower than the lower limit of normal visual acuity for children of the same age, and the difference in visual acuity between the two eyes is less than 2 lines, and no risk factors causing amblyopia are found, the diagnosis of amblyopia should not be made hastily, and the child can be listed as a subject of observation. Common causes of amblyopia: 1) Refractive amblyopia: If the refractive difference between the two eyes is large, amblyopia may occur in the eye with the larger prescription. (2) Refractive amblyopia: Most often occurs in patients with high refractive error who have never worn corrective lenses (mainly seen in high hyperopia or astigmatism, often bilateral). (3) Strabismic amblyopia: uncorrected monocular strabismus, where the strabismic eye is prone to amblyopia. (4) Form-deprivation amblyopia: Most often occurs in children with refractive interstitial clouding (e.g., congenital cataracts, corneal clouding, etc.), complete ptosis, and other conditions. Treatment of amblyopia: Once amblyopia is diagnosed, it should be treated immediately. The basic strategy for the treatment of amblyopia is precise prescription of lenses and masking of the dominant eye. Before treatment, the cause of amblyopia must first be identified and these disorders must first be treated aggressively.