What is the expected finding for BAF in cpm?

• A. 6 cpm
• B. 8 cpm
• C. 10 cpm
• D. 12 cpm

Answer: (B)

Binocular accommodative facility measures how quickly and smoothly the eyes can shift focus while both eyes remain aligned, using a flipper with alternating ±2.00 diopter lenses. A complete cycle means clearing a plus lens and then a minus lens (or vice versa) in sequence, and you count how many cycles can be completed in one minute.

The typical normal value for a healthy, non-fatigued adult is about eight cycles per minute. This reflects good dynamic accommodation and vergence flexibility, allowing rapid shifts between near and distance demands without breaking fusion. Values around eight indicate normal facility; significantly lower values point to accommodative infacility or vergence issues that can cause near tasks to feel effortful or tiring. Higher values are less common but can occur in some individuals and may simply reflect measurement variability or high attention during testing.

So, eight cycles per minute is the expected finding for normal binocular accommodative facility.