How does convergence insufficiency present and which tests are most diagnostic?

How does convergence insufficiency present and which tests are most diagnostic?

• A. Near exophoria with reduced PFV; symptoms include eyestrain and headaches; NPC reduced; positive fusional vergence insufficient.
• B. Far exophoria with normal PFV
• C. Paradoxical esotropia at near
• D. Color vision deficiency

Answer: (A)

Convergence insufficiency shows a weakness in bringing the eyes together for near tasks. The hallmark is exophoria at near, meaning the eyes tend to drift outward more when looking at something up close, because the vergence system cannot generate enough convergence. This is accompanied by reduced positive fusional vergence at near, so the amount of convergent vergence the eyes can sustain to neutralize the near exophoria is limited. The near point of convergence is also receded, indicating a slower or more distal ability to fuse images at close range. Patients often report asthenopic symptoms like eyestrain and headaches with near work. This combination—near exophoria with reduced PFV at near, and a receded NPC (along with relevant symptoms)—is the most diagnostic pattern for convergence insufficiency. The other options describe patterns that don’t match CI (for example, far exophoria with normal PFV, or an esotropic near deviation, or unrelated color vision issues), so they don’t fit the typical presentation.

Convergence insufficiency shows a weakness in bringing the eyes together for near tasks. The hallmark is exophoria at near, meaning the eyes tend to drift outward more when looking at something up close, because the vergence system cannot generate enough convergence. This is accompanied by reduced positive fusional vergence at near, so the amount of convergent vergence the eyes can sustain to neutralize the near exophoria is limited. The near point of convergence is also receded, indicating a slower or more distal ability to fuse images at close range. Patients often report asthenopic symptoms like eyestrain and headaches with near work.

This combination—near exophoria with reduced PFV at near, and a receded NPC (along with relevant symptoms)—is the most diagnostic pattern for convergence insufficiency. The other options describe patterns that don’t match CI (for example, far exophoria with normal PFV, or an esotropic near deviation, or unrelated color vision issues), so they don’t fit the typical presentation.