Ohio Revised Code Title I. State Government § 145.561

(A) Except as provided in division (B) of this section and section 145.363, 145.573, or 145.574 of the Revised Code, the granting of a retirement allowance, annuity, pension, or other benefit to any person pursuant to action of the public employees retirement board vests a right in such person, so long as the person remains the recipient of any benefit of the funds established by section 145.23 of the Revised Code, to receive such retirement allowance, annuity, pension, or other benefit at the rate fixed at the time of granting such retirement allowance, annuity, pension, or other benefit. Such right shall also be vested with equal effect in the recipient of a grant heretofore made from any of the funds named in section 145.23 of the Revised Code.

(B) This section does not apply to an increase made under section 145.323 of the Revised Code for a recipient whose benefit effective date is on or after the effective date of this amendment.