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. 2021 Feb 16;9(4):e489–e551. doi: 10.1016/S2214-109X(20)30488-5

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© 2021 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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An adaptation of the WHO universal health care “cube” which illustrates the three dimensions of UHC: population coverage, service coverage, and affordability. An inner cube illustrates the additional dimension of quality. — Considerations for universal eye health coverage

Adapted from WHO 2015,¹⁸⁵ to contextualise to eye health services and include the quality component. The inner cube has a colour gradation representing a range in the quality of delivered services; green represents effective quality services and blue represents ineffective services.