What is the recorded residual plus value for the FCC result in the example?

• A. +0.50 D
• B. +0.25 D
• C. 0.00 D
• D. -0.50 D

Answer: (A)

In FCC testing, the recorded residual plus value tells you how much additional plus power is still needed to bring the refraction to neutral after applying the fused cross-cylinder refinements. A value of +0.50 D means there is a small remaining hyperopic error that requires an extra half diopter of plus correction in the tested meridian.

So, the example shows that the neutralization on the FCC chart sits at +0.50 D, indicating a modest residual hyperopia. If the value were +0.25 D, there would be a smaller residual; if it were 0.00 D, neutralization would be complete; if it were -0.50 D, there would be a residual myopic error needing minus power.