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An assessment of a modern touch-screen tablet computer with reference to core physical characteristics necessary for clinical vision testing
Authors:Tariq M Aslam  Ian J Murray  Michael Y T Lai  Emma Linton  Humza J Tahir  Neil R A Parry
Affiliation:1.Faculty of Medical and Human Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK;2.Manchester Royal Eye Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester M13 9WL, UK;3.Health Science Research Centre and Vision Science Centre, University of Manchester, Manchester M13 9NT, UK;4.Birmingham and Midland Eye Centre, Dudley Road, Birmingham B18 7QH, UK
Abstract:There are a multitude of applications using modern tablet computers for vision testing that are accessible to ophthalmology patients. While these may be of potential future benefit, they are often unsupported by scientific assessment. This report investigates the pertinent physical characteristics behind one of the most common highest specification tablet computers with regard to its capacity for vision testing. We demonstrate through plotting of a gamma curve that it is feasible to produce a precise programmable range of central luminance levels on the device, even with varying background luminance levels. It may not be possible to display very low levels of contrast, but carefully using the gamma curve information allows a reasonable range of contrast sensitivity to be tested. When the screen is first powered on, it may require up to 15 min for the luminance values to stabilize. Finally, luminance of objects varies towards the edge of the screen and when viewed at an angle. However, the resulting effective contrast of objects is less variable. Details of our assessments are important to developers, users and prescribers of tablet clinical vision tests. Without awareness of such findings, these tests may never reach satisfactory levels of clinical validity and reliability.
Keywords:visual function  iPad  tablet computer  vision testing
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