Why do i see a shadow on top of letters i read on the t.v? it like extends upwards i have astogmatism&blepharitis i'm afraid it might be more serious

Surface problem: If one eye has a new onset of shadowing like you described it is probably a surface problem of the eye like a corneal abrasion, dry eye, or contact lens related problem. If this has been going on for a while, it could be uncorrected astigmatism leading to some distortion of the cornea. If there is no pain or redness of the eye, the problem is likely to resolve spontaneously. Otherwise, get an exam