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. 2021 Jun 21;11:12971. doi: 10.1038/s41598-021-92396-5

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. 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. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Contrast Sensitivity in different frequencies for keratoconus group, keratoconus subjects with visual acuity of 0.00 LogMar and for control group. Blue bars represent contrast sensitivity for keratoconus subjects, orange bars represent contrast sensitivity for keratoconus subjects with visual acuity of 0.00 LogMar and gray bars represent contrast sensitivity for Control subjects. *Significant level of < 0.005. The figure was generated using Microsoft 365 Excel Version 2103 and the resolution adjusted using Microsoft 365 PowerPoint Version 2103.