Which finding on exam most indicates convergence weakness?

Which finding on exam most indicates convergence weakness?

• A. Hyperopia without convergence issues
• B. Exophoria at distance with normal NPC
• C. Normal convergence and no symptoms
• D. Near exophoria, reduced PFV, decreased NPC, and symptomatic near tasks

Answer: (D)

Convergence weakness shows up when the eyes can’t effectively converge for near tasks, so near alignment drifts outward, the fusional convergence reserve is reduced, and the near point of convergence is farther. The most diagnostic pattern is near exophoria paired with a reduced positive fusional vergence (PFV), a receded (decreased) near point of convergence (NPC), and symptoms like eyestrain or headaches during near work. This combination directly reflects the vergence system’s insufficient ability to converge to a near target, even as distance function can be normal. The other findings don’t line up with this pattern: hyperopia without convergence issues doesn’t indicate vergence weakness; exophoria at distance with normal NPC doesn’t show near convergence failure; and normal convergence with no symptoms shows no vergence problem.

Convergence weakness shows up when the eyes can’t effectively converge for near tasks, so near alignment drifts outward, the fusional convergence reserve is reduced, and the near point of convergence is farther. The most diagnostic pattern is near exophoria paired with a reduced positive fusional vergence (PFV), a receded (decreased) near point of convergence (NPC), and symptoms like eyestrain or headaches during near work. This combination directly reflects the vergence system’s insufficient ability to converge to a near target, even as distance function can be normal. The other findings don’t line up with this pattern: hyperopia without convergence issues doesn’t indicate vergence weakness; exophoria at distance with normal NPC doesn’t show near convergence failure; and normal convergence with no symptoms shows no vergence problem.