Can over-exertion lead to double vision?

In summer 2020 before I knew I had CFS, I thought I had only mental illness, so I pushed myself and went on more and longer walks than normal. However, within a month or so, I was on a walk and suddenly realised I had double vision and was confused crossing the road because I couldn't tell where the right lamppost and road markings were.

Since then both CFS and double vision has got worse. Could overexertion have caused permanent double vision? I may have to have surgery if it gets worse.