Your patient sees 20/20 without correction in the right eye. You have performed refractometry and have improved this to 20/40. Which of the following tests could help you know whether or not this is the best acuity possible?

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1. Your patient sees 20/20 without correction in the right eye. You have performed refractometry and have improved this to 20/40. Which of the following tests could help you know whether or not this is the best acuity possible?