The small, poorly dilated pupil is one of the most common difficulties faced by cataract surgeons. In 2015, cataract was identified as the leading cause of moderate or severe vision impairment globally. The Creative Commons Public Domain Dedication waiver ( ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
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