The left eye 1.2 and the right eye 0.1 represent the patient’s visual acuity test results, with the left eye having normal vision and the right eye showing a severe loss of vision. Visual acuity is an indicator of visual acuity. Under normal circumstances, visual acuity should reach 1.0, and individual patients may have better visual acuity, reaching 1.2 or 1.5. However, if the visual acuity is only 0.1, it is seriously lower than normal, which means that there is likely to be ophthalmologic diseases, and you should go to the ophthalmology department of the hospital for examination in a timely manner. Usually, slit lamp microscopy, optometry, fundoscopy, etc. are needed to clarify the cause. Common causes include cataract, refractive error, amblyopia, fundus lesions and so on. Only after a clear diagnosis can further treatment measures be formulated to promote vision recovery.