Compared to BAF, MAF is expected to yield a higher cpm value.

• A. BAF
• B. MAF
• C. They are the same
• D. Cannot tell

Answer: (B)

When testing accommodative facility, cycles per minute reflect how quickly a patient can flip focus between plus and minus lenses. In monocular viewing, one eye is used at a time, so you remove the need to maintain binocular fusion. This eliminates vergence demands and the associated adaptation that can slow down the response of the accommodation system. With no need to align or fuse images for both eyes, the eye can switch focus more rapidly, yielding more complete cycles within a minute. In binocular viewing, the brain must coordinate both eyes to stay single, which adds vergence and fusion processing that can delay rapid changes in accommodation, typically reducing the number of complete cycles the patient can perform in the same amount of time. So, the monocular condition generally produces a higher cpm value than the binocular condition.