![]() For some measures, true theoretical values exist. In 10 different tasks, we evaluated eye-tracking related measures such as: the decay of accuracy, fixation durations, pupil dilation, smooth pursuit movement, microsaccade classification, blink classification, or the influence of head motion. ![]() To obtain a more comprehensive description of properties, we developed an extensive eye-tracking test battery. Additionally, different experimental paradigms require the analysis of different types of eye movements for instance, smooth pursuit movements, blinks or microsaccades, which themselves cannot readily be evaluated by using spatial accuracy or precision alone. These two values alone are not sufficient to serve as a benchmark for an eye-tracker: Eye-tracking quality deteriorates during an experimental session due to head movements, changing illumination or calibration decay. Unfortunately, it is often the case that only the spatial accuracy and precision values are available from the manufacturers. PeerJ 7: e7086 Įye-tracking experiments rely heavily on good data quality of eye-trackers. A new comprehensive eye-tracking test battery concurrently evaluating the Pupil Labs glasses and the EyeLink 1000. ![]() ![]() Cite this article Ehinger BV, Groß K, Ibs I, König P. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. Licence This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. A problem with any of the three layers may cause dry eye.3 Department of Neurophysiology and Pathophysiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany DOI 10.7717/peerj.7086 Published Accepted Received Academic Editor Mario Negrello Subject Areas Neuroscience, Psychiatry and Psychology Keywords Pupil dilation, Smooth pursuit, Microsaccades, Blinks, Eye-tracker benchmark, Accuracy and precision, Head movements, EyeLink 1000, Pupil Labs glasses, Calibration decay Copyright © 2019 Ehinger et al. These create a film which covers the white of the eye and the cornea. Tears have three main components a watery component, an oily component and mucus. Vitreous humour – a clear gel that fills the inside of the eye and helps it to retain its shape. Sclera – also known as the white of your eye, this is the outer layer of the human eye. Retina – the light-sensitive tissue lining at the back of your eye that converts light into electrical impulses that are sent along the optical nerve to the brain. Pupil – this is the opening in the centre of the iris that lets in light. ![]() Optic nerve – a bundle of more than one million nerve fibres that carries visual messages from the retina to the brain. Macula – the sensitive area in the centre of the retina responsible for what you see ahead of you (central vision). Lens – the clear part of the eye behind the iris that helps to focus light, or an image, onto the retina. Iris – the coloured part of your eye that regulates the amount of light entering. Light rays pass through the pupil in the cornea.Īqueous humour – maintains the pressure in your eye and nourishes the cornea and the lens by supplying amino acids and glucose, as well as vitamin C.Ĭhoroid – a thin layer of blood vessels that nourish the retina and absorb scattered light.Ĭiliary muscles – a circular muscle that relaxes or tightens to enable the lens to change shape for focusing.Ĭornea – a clear covering on the front of your eye that focuses light entering the eye.įovea – a tiny pit in the macula that provides the sharp central vision that you need for activities, such as reading and driving. Find out about different parts of the eye.īasically, the role of the eye is to convert light into electrical signals called nerve impulses that the brain converts into images of our surroundings. ![]()
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