Hi
Welcome to the forum!
There are two possibilities that you should rule out. One is some refractive error in the eye like farsightedness or near sightedness. Glaucoma of the eye and cataract too can cause this. Please consult an eye specialist.
The other possibility is high blood pressure. Get your blood pressure checked. It is difficult to comment beyond this at this stage.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!