Your patient had 20/20 vision OD 9 months ago. Today it is 20/60, without pinhole improvement. In the absence of obvious pathology, the eye care provider may want which of the following tests to help diagnose the problem?

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Your patient had 20/20 vision OD 9 months ago. Today it is 20/60, without pinhole improvement. In the absence of obvious pathology, the eye care provider may want which of the following tests to help diagnose the problem?