How many degrees is the vision of 0.4? Is it serious? Physical examination today.

About 250 degrees. It's not serious, but you should wear glasses to avoid improving your eyesight. Pay attention to eye hygiene at ordinary times, and you can't recover your eyesight if you improve it.

Extended data Normal people's eye vision is above 1.0, which usually refers to the minimum separable vision of the eyes rather than the minimum visible vision. Therefore, the eye chart reflects the minimum visual angle between the two points of the subject's gaze, that is, the minimum separable vision, or 1' visual angle vision, which can represent the subject's best visual function.

Vision refers to the ability of retina to distinguish images. Visual acuity is judged by the ability of retina to distinguish images. However, when the refractive medium of the eye (such as cornea, lens, vitreous body, etc.). ) become turbid or have refractive errors (including myopia, hyperopia, astigmatism, etc.). ), the visual acuity of eyes with good retinal function will still decline.

Reference Vision _ Baidu Encyclopedia