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Good evening, I am Dr Ruff. Thank you for contacting us this evening.
I am sorry about your daughter and this worry his is causing you. The most common cause in children is something called Astigmatism, this causes a refractive problem due to the shape of the lens/eye, and can cause a blurry image, on examination and what your daughter is perceiving.
I do not think you have anything to be worried about, however further examination would obviously be useful to ensure this is not a problem.