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this study found that providing free glasses to children with vision problems led to increased academic performance. Providing free glasses was superior to providing vouchers which was superior to doing nothing (the control group). The effect was small but appeared to be more important than parental education or wealth. BMJ. 2014; 349: g5740.    (retrieved Nov, 2014). There are currently 1090 pearls in the database. While every attempt has been made to ensure accuracy, mistakes can and do occur. Use databank at your own risk. All pearls © 2024 by the Internet Medical Association. Click Here to view more medical pearls.