In fusional vergence dysfunction, would you expect more abnormal BAF or MAF results?

• A. BAF
• B. MAF
• C. MEM
• D. NRA

Answer: (A)

Fusional vergence dysfunction mainly affects the ability to use vergence to keep both eyes aligned and fused when accommodation demands change. The binocular accommodative facility test (BAF) taps into how well both eyes work together to shift focus while maintaining fusion, especially under changing demands. When vergence is limited, this binocular task shows greater difficulty, so BAF results tend to be more abnormal.

Monocular accommodative facility (MAF) tests the ability to adjust focus with one eye, which doesn’t require binocular coordination, so it’s less likely to be markedly abnormal in FVD. MEM and NRA assess accommodation and its interaction with vergence differently and aren’t as directly diagnostic of fusional vergence status as BAF.

So the test that best reveals the issue in fusional vergence dysfunction is the binocular accommodative facility, leading to more abnormal BAF results.