If by "correct" you mean change your option election, you can do so no later than 30 days after your retirement date by filing an Election of Retirement Benefit form (RET-54.6) with NYSTRS. If you are referring to an error made in the calculation of your benefit, there is no statute of limitations for correcting the error.
Contact NYSTRS and they can answer your question: https://www.nystrs.org/Contact/Get-in-Touch
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