Which statement best describes Convergence Excess regarding accommodation lag on MEM?

Which statement best describes Convergence Excess regarding accommodation lag on MEM?

• A. Convergence Insufficiency shows greater lag
• B. Convergence Excess shows greater lag
• C. Lag is the same for both
• D. There is no lag in either condition

Answer: (B)

In MEM we’re looking at how well the eyes’ accommodation keeps up with the near target—the difference between the stimulus to focus and the actual focus. When convergence excess is present, the vergence system over-converges at near. This excessive convergence disrupts the normal coordination between convergence and accommodation (the accommodative convergence link), so the accommodative response often falls short of the demand. The result is a larger accommodative lag measured on MEM. In other words, the near demand isn’t met fully by the eye’s focusing response, producing a bigger lag. This is why convergence excess is described as showing greater lag on MEM.

In MEM we’re looking at how well the eyes’ accommodation keeps up with the near target—the difference between the stimulus to focus and the actual focus. When convergence excess is present, the vergence system over-converges at near. This excessive convergence disrupts the normal coordination between convergence and accommodation (the accommodative convergence link), so the accommodative response often falls short of the demand. The result is a larger accommodative lag measured on MEM. In other words, the near demand isn’t met fully by the eye’s focusing response, producing a bigger lag. This is why convergence excess is described as showing greater lag on MEM.