What NPC finding is commonly observed in convergence insufficiency?

What NPC finding is commonly observed in convergence insufficiency?

• A. Receded NPC
• B. Normal NPC
• C. Advanced NPC
• D. Variable NPC

Answer: (A)

Convergence insufficiency shows a problem with maintaining binocular convergence for near tasks, so the closest point at which both eyes can fuse single vision is farther from you than normal. That point, the near point of convergence, becomes receded because the vergence system can’t converge effectively as the target approaches. In practice, you’ll find an NPC break that is farther than normal—typically more than about 6 cm from the nose—often with a slower recovery. This contrasts with an advanced NPC, where convergence occurs too readily and the near point is unusually close, or a normal NPC, which would be within normal limits. Variable NPC can occur, but the hallmark in convergence insufficiency is the receded NPC.

Convergence insufficiency shows a problem with maintaining binocular convergence for near tasks, so the closest point at which both eyes can fuse single vision is farther from you than normal. That point, the near point of convergence, becomes receded because the vergence system can’t converge effectively as the target approaches. In practice, you’ll find an NPC break that is farther than normal—typically more than about 6 cm from the nose—often with a slower recovery. This contrasts with an advanced NPC, where convergence occurs too readily and the near point is unusually close, or a normal NPC, which would be within normal limits. Variable NPC can occur, but the hallmark in convergence insufficiency is the receded NPC.