Base-in prisms produce what impact on near tasks?

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Multiple Choice

Base-in prisms produce what impact on near tasks?

Explanation:
Base-in prisms shift the image toward the nose for each eye. To keep both eyes fused on a near target, the visual system must compensate by diverging the eyes more than usual, increasing negative fusional vergence. So, the presence of base-in prisms raises the divergence demand at near tasks. Accommodation isn’t directly changed by prisms, so they don’t decrease or increase accommodation themselves; they mainly alter vergence requirements.

Base-in prisms shift the image toward the nose for each eye. To keep both eyes fused on a near target, the visual system must compensate by diverging the eyes more than usual, increasing negative fusional vergence. So, the presence of base-in prisms raises the divergence demand at near tasks. Accommodation isn’t directly changed by prisms, so they don’t decrease or increase accommodation themselves; they mainly alter vergence requirements.

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