Does NRA indirectly test PFV or NFV?

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Multiple Choice

Does NRA indirectly test PFV or NFV?

Explanation:
NRA centers on how the vergence system responds when you relax accommodation at near. When plus lenses are added, the eye’s need to accommodate decreases, which reduces accommodative convergence. To keep the near target fused, the eyes must still converge enough, and that convergence comes from positive fusional vergence. So performance on the NRA test reflects how well the PFV system can supply the needed convergence as accommodation is eased. NFV isn’t the primary driver here, since the task isn’t about diverging to maintain fusion. Therefore, NRA indirectly tests PFV.

NRA centers on how the vergence system responds when you relax accommodation at near. When plus lenses are added, the eye’s need to accommodate decreases, which reduces accommodative convergence. To keep the near target fused, the eyes must still converge enough, and that convergence comes from positive fusional vergence. So performance on the NRA test reflects how well the PFV system can supply the needed convergence as accommodation is eased. NFV isn’t the primary driver here, since the task isn’t about diverging to maintain fusion. Therefore, NRA indirectly tests PFV.

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