No, you don't need to send a letter to the IRS from your eye doctor showing your are blind.
Yes, you get a deduction from being over 65 and for being blind. Additional Standard Deduction Amounts for Tax Year 2018
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Age: If you are age 65 or older, you may increase your standard deduction by $1,600 if you file Single or Head of Household. If you are Married Filing Jointly and you OR your spouse is 65 or older, you may increase your standard deduction by $1,300. If BOTH you and your spouse are 65 or older, you may increase your standard deduction by $2,600.
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Blindness: If you are legally blind, you may increase your standard deduction by $1,600 if filing Single or Head-of-Household. If you are Married Filing Jointly and you OR your spouse is blind, you may increase your standard deduction by $1,300. You may increase your standard deduction by $2,600 if BOTH you and your spouse are blind.
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