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. 2015 Apr 1;18(2):145–152. doi: 10.1089/rej.2014.1613

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© The Author(s) 2015; Published by Mary Ann Liebert, Inc.

This Open Access article is distributed under the terms of the Creative Commons License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

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FIG. 2. — Changes in sub-scale scores on the Pittsburgh Sleep Quality Index (PSQI) after cataract surgery. Significantly greater improvements were seen for the sub-scale scores for sleep latency (p<0.001 at 7 months, unpaired t-test) and sleep disturbance (p<0.05 and p<0.01 at 2 and 7 months, respectively) in patients receiving a clear (C) intra-ocular lens (IOL) than those receiving a yellow (Y) IOL. Data show mean differences in different sub-scale scores, calculated by subtracting pre-operative values from post-operative values, in patients implanted with a yellow IOL (n=135) or a clear IOL (n=71).