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How wide is the central vision?

I wish to know how wide the central vision e.g. by fixating to one point how far to the side can we place letters so the reader can still recognize them? Is there a test for this I could ask for at an ophthalmology exam?
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177275 tn?1511755244
I can't give you that information  
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Have no-one tested this 'visual span' (or what is it called) before? Or was the question unclear (because I do tend to phrase wrong)?
I don't think it's been tested because it will vary from individual to another. You can do your own research. Not something useful in clinical practice.
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177275 tn?1511755244
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