Does NRA indirectly test PFV or NFV?

Get ready for the NBEO Binocular Vision Test. Study with comprehensive materials and multiple-choice questions. Enhance your exam readiness with detailed explanations and practice questions to improve understanding and performance.

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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