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

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.

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.