Glaucoma surgery and induced astigmatism: a systematic review.

Eye Vis (Lond) · 2017 · PMC5691392 · PMID 29177182

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may not be significantno p-value reported

Additionally, after this waiting period, the amount of residual astigmatism may not be significant enough to affect visual acuity.

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an overall trendno p-value reported

Although they confirmed an overall trend towards vertical steepening and WTR astigmatism, they identified 3 subgroups characterised by 1) superior corneal steepening, 2) superior corneal flattening, and 3) irregular changes.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.