Left eye 0.5 right eye 0.8, this situation is not normal, normal adult eyesight should be consistent, and can reach 1.0 and above. Left eye 0.5 right eye 0.8, vision is obviously abnormal, caused by vision loss for many reasons, myopia, hyperopia, astigmatism and other refractive errors are more common causes, need to improve the medical optometry and other tests later clear diagnosis. If it is myopia and other refractive errors, a clear diagnosis should be corrected in a timely manner, you can choose under the guidance of the doctor glasses or surgery and other ways to correct vision. Parents are advised to take their children to the ophthalmology department of the hospital as soon as possible when they find that the left eye is 0.5 and the right eye is 0.8, so as to avoid delaying the condition.