Explanation:
This phenomenon should go back to the poor coverage of the eyeball, this is a real example proving the deficiency in the human eye's angle of vision. During the day, the pupil shrinks, promoting the light rays to fall right on the center of the lens to facilitate more light rays into the eyeball, at that time the images that the human eye sees are behind the lens. You see a spherical halo because the lens is round.

Almost everyone sees this sphere. If you often see this halo, it cannot be said that your eyes have a problem. However, the poor transparency of the lens also makes you see that halo, this is the phenomenon of cataract. Therefore, if at the closest range you see this halo, it is best to go to the doctor and check for cataracts.