Intermittent vision loss in one eye for a few minutes, especially with normal routine eye tests, can be due to issues like Amaurosis fugax, Ocular migraine, or tear-film problems like Dry eye syndrome. Since this has been happening for two years, it?s important to go beyond basic tests?consult an ophthalmologist or neurologist for detailed evaluation (retina exam, visual field test, and possibly brain/vascular imaging). Meanwhile, keep eyes lubricated with artificial tears, manage stress, and control BP, sugar, and cholesterol, as some causes can be related to circulation.