Using the balancing formula Add = (NRA + PRA)/2 + BCC, if NRA = +2.25 and PRA = -1.25 measured through a +0.50 add, what is the calculated add?

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Multiple Choice

Using the balancing formula Add = (NRA + PRA)/2 + BCC, if NRA = +2.25 and PRA = -1.25 measured through a +0.50 add, what is the calculated add?

Explanation:
The calculation combines the accommodative responses with a balancing convergence correction to determine the near add. First, add NRA and PRA: 2.25 + (-1.25) = 1.00. Take half of that: 1.00 / 2 = 0.50. Then include the balancing convergence correction (BCC), which is +0.50 when measured through a +0.50 add. Add these together: 0.50 + 0.50 = 1.00. So the calculated near add is +1.00 diopter.

The calculation combines the accommodative responses with a balancing convergence correction to determine the near add. First, add NRA and PRA: 2.25 + (-1.25) = 1.00. Take half of that: 1.00 / 2 = 0.50. Then include the balancing convergence correction (BCC), which is +0.50 when measured through a +0.50 add. Add these together: 0.50 + 0.50 = 1.00. So the calculated near add is +1.00 diopter.

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