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. 2019 Dec 16;6:40. doi: 10.1186/s40662-019-0165-y

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Higher order corneal morphological aberrations (HOCMAs) calculation. HOCMAs – Morphological substrate for the anterior corneal surface optical aberrations above the second order, calculated with respect to the best fit toric surface within a predefined diameter. The HOCMAs of the anterior corneal surface are calculated as the difference between the positive index of irregularity of the anterior corneal surface (Ia+) and the negative index of irregularity of the anterior corneal surface (Ia-), which are respectively the maximum and the minimum difference between the anterior corneal surface and the best fit toric surface calculated within the predefined domain (D)