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An established patient returns every 6 months or so complaining of decreased vision. Refractometry has shown gradual increase of astigmatism. The most helpful test to determine the cause of this would be a(n):

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An established patient returns every 6 months or so complaining of decreased vision. Refractometry has shown gradual increase of astigmatism. The most helpful test to determine the cause of this would be a(n):






 
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