The persons with this health condition often complain of seeing things double instead of a single object. It is known as a double vision in medicine. In many cases of this illness, the symptoms continue to progress during the whole life. Why would the person have double vision? The extra-ocular muscles suffer when the disease shows up. As a result, the individual is no longer able to perceive the visual images the way they appear. The symptom is most noticeable when the patient makes an attempt to read, watch television, play video games, or drive, making the last activity extra risky.