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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Pinhole can reduce refractive error up to -
assistant
The correct answer is  Pin-hole test: It helps in confirming whether the optical correction in the trial frame is correct or not.
An improvement in visual acuity while looking through a pinhole indicates that optical correction in the trial frame is incorrect.
PPinholecan reduce refractive error upto 3 D.