In fusional vergence dysfunction, which accommodative test result is typically abnormal?

In fusional vergence dysfunction, which accommodative test result is typically abnormal?

• A. BAF Results
• B. MAF Results
• C. MEM Results
• D. NRA Results

Answer: (A)

Fusional vergence dysfunction mainly compromises the eyes’ ability to use vergence forces to maintain single vision, while the actual focusing mechanism is usually intact. Because binocular accommodative facility requires rapid, coordinated change in both eyes’ accommodation while preserving fusion, a weak fusional vergence system makes this binocular task harder. The result is an abnormal binocular accommodative facility test. In contrast, the monocular tests of accommodation assess the focusing system in one eye or the accuracy and relaxation of accommodation, which are typically normal in this condition since the issue lies with vergence, not the accommodative system.

Fusional vergence dysfunction mainly compromises the eyes’ ability to use vergence forces to maintain single vision, while the actual focusing mechanism is usually intact. Because binocular accommodative facility requires rapid, coordinated change in both eyes’ accommodation while preserving fusion, a weak fusional vergence system makes this binocular task harder. The result is an abnormal binocular accommodative facility test.

In contrast, the monocular tests of accommodation assess the focusing system in one eye or the accuracy and relaxation of accommodation, which are typically normal in this condition since the issue lies with vergence, not the accommodative system.