Divergence excess is often associated with which AC/A characteristic?

Divergence excess is often associated with which AC/A characteristic?

• A. A low AC/A ratio.
• B. A relatively high AC/A ratio.
• C. No relation to AC/A ratio.
• D. Variable AC/A depending on task.

Answer: (B)

Divergence excess shows up when the exodeviation is greater at distance than at near, and this pattern is tied to how the AC/A ratio links accommodation to convergence. The AC/A ratio measures how much convergence you get for every diopter of accommodation. If this ratio is relatively high, focusing on a near target produces a strong accommodative convergence response, which reduces the near exodeviation. At distance, there’s less accommodative effort, so less convergence is triggered and the exodeviation appears larger. So the distance deviation ends up bigger than the near deviation, a situation that is characteristically associated with a high AC/A ratio.

Divergence excess shows up when the exodeviation is greater at distance than at near, and this pattern is tied to how the AC/A ratio links accommodation to convergence. The AC/A ratio measures how much convergence you get for every diopter of accommodation. If this ratio is relatively high, focusing on a near target produces a strong accommodative convergence response, which reduces the near exodeviation. At distance, there’s less accommodative effort, so less convergence is triggered and the exodeviation appears larger. So the distance deviation ends up bigger than the near deviation, a situation that is characteristically associated with a high AC/A ratio.