So I accidentally said I was blind on my taxes... What should I do?

If might have to fix this with your Federal and maybe even your state income taxes. On the Federal level you will need to file a 1040-X. Your state if the same fix is needed should have a similar form.

You will have to go back as far as you can and fix each year. Generally you have three years to file the 1040-x when you are due a refund, but that limit goes away if you owe them more. Your state may have different rules. There will interest and penalties in addition to owing the additional tax.

There is another key factor. The blindness checkbox gives you a larger standard deduction. If you itemized that year then the incorrect statement might not change anything. The State rules may be different.

Just for reference, in Publication 501 (2019), Dependents, Standard Deduction, and Filing Information

Higher Standard Deduction for Blindness

If you are blind on the last day of the year and you don't itemize deductions, you are entitled to a higher standard deduction.

Not totally blind.

If you aren't totally blind, you must get a certified statement from an eye doctor (ophthalmologist or optometrist) stating that:

• You can't see better than 20/200 in the 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 these limits, the statement should include this fact. Keep the statement in your records.

If your vision can be corrected beyond these limits only by contact lenses that you can wear only briefly because of pain, infection, or ulcers, you can take the higher standard deduction for blindness if you otherwise qualify.