Blind in one eye, considered legally blind?

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From the 1040 instructions:

If you were not totally blind as of December 31, 2016, you must get a statement certified by your eye doctor (ophthalmologist or optometrist) that:

• You can't see better than 20/200 in your better eye with glasses or contact lenses, or

• Your field of vision is 20 degrees or less.

If your eye condition isn't likely to improve beyond the conditions listed above, you can get a statement certified by your eye doctor (ophthalmologist or optometrist) to this effect instead.

You must keep the statement for your records.