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Updated: Apr 30, 2026
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Evaluating Tests of Cognition using a Computerized Touch-Sensitive Tablet, Eye Tracking, and Functional Magnetic Resonance Imaging
Published on: January 30, 2026
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Optimisation and assessment of three modern touch screen tablet computers for clinical vision testing
Humza J Tahir1, Ian J Murray2, Neil R A Parry3
1Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom.
Plos One
|April 25, 2014
Summary
Tablet screen quality is crucial for accurate vision testing. This study calibrated three devices, finding typical performance but variations in uniformity and reflectance, suggesting calibration optimizes clinical use.
Area of Science:
- Ophthalmology
- Medical Technology
- Display Technology
Background:
- Portable tablet computers offer high-resolution displays suitable for vision testing.
- Clinical validation requires understanding tablet screen limitations (resolution, brightness, contrast, viewing angle).
- Previous work assessed the iPad 3; this study expands to two additional devices.
Purpose of the Study:
- To evaluate screen characteristics of portable tablets for clinical vision testing.
- To develop and apply a standardized protocol for tablet screen calibration.
- To identify practical methods for optimizing display quality for vision assessments.
Main Methods:
- Standardized methods were used to measure gamma function, warm-up time, screen uniformity, viewing angle effects, and reflectance.
- Three different tablet devices were investigated.
- A calibration protocol was outlined and applied.
Main Results:
- All three tested devices exhibited typical gamma functions for voltage and luminance.
- Average warm-up time for the screens was approximately 15 minutes.
- Significant differences were observed in display homogeneity and reflectance across the devices.
Conclusions:
- Tablet screens show consistent gamma functions and warm-up times but variable uniformity and reflectance.
- Screen calibration is essential for reliable vision testing using tablet devices.
- Practical optimization strategies can enhance display quality for clinical applications.
