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. 2014 Jun 5;13:69. doi: 10.1186/1475-925X-13-69

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Copyright © 2014 Nowak et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution 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. 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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Photograph of the system. The measuring unit of the system is installed at the base of an ophthalmological slit lamp. In this figure, the selected system elements and forehead height control system and joystick are indicated by arrows.