Vertical prismatic imbalance calculation requires information from how many eyes?

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Multiple Choice

Vertical prismatic imbalance calculation requires information from how many eyes?

Explanation:
Vertical prismatic imbalance is the difference in vertical prism power between the two eyes. To determine how unbalanced they are, you must know the vertical prism for both eyes, because the imbalance is defined by comparing the two values. If you only have data from one eye, you can’t assess the relative vertical prism between eyes, since the other eye could contribute any amount. So, information from both eyes is required.

Vertical prismatic imbalance is the difference in vertical prism power between the two eyes. To determine how unbalanced they are, you must know the vertical prism for both eyes, because the imbalance is defined by comparing the two values. If you only have data from one eye, you can’t assess the relative vertical prism between eyes, since the other eye could contribute any amount. So, information from both eyes is required.

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