Hello
There may be two factors
1. Uncorrected refractive error
2. Convergence insufficiency
Consult local opthalmologist and get comprehensive eye exam
Hello, it seems like your are having refractive errors of eye (probably hypermetropia). Which makes you unable to focus your eye for nearer objects, and trying to focus cause you experience, headache which in turn makes to lose concentration. All you have to do is visit nearer ophthalmic centre or eye hospital, get tested for refractive errors(which is a 5min OPD procedure).
Hello sir
I have blurred vision in my left eye and perfect vision with my right eye if I close my right
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