An electric arc is a visible plasma discharge between two electrodes that is caused by electrical current ionizing gasses in the air. Electric arcs occur in nature in the form of lightning.
Myopia is a disease connected with eyes. Myopia is also called as Nearsightedness.
It is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry.
It occurs when the shape of your eye causes light rays to bend (refract) incorrectly, focusing images in front of your retina instead of on your retina.