The effects of different displays on the isolated-check VEP and pattern VEP

Abstract

Objective To compare the effects of liquid crystal display (LCD) and organic light emitting diode (OLED) on the pattern visual evoked potential (PVEP) and the isolated-check visual evoked potential (icVEP). Methods In this self control study, 8 healthy male volunteers (16 eyes), aged 22.1±3.0 years, were recruited to measure PVEPs and icVEPs using the Neucodia Visual Electrophysiological Diagnostic Systems with either the LCD or the OLED. The test sequences of different displays and test items were random. All measurements were performed by the same examiner. Paired t-tests were used to compare the results of the two systems. Results Compared with LCD, the OLED-measured P100 amplitudes of the PVEPs, including 4.8 cpd, 3.2 cpd, 2.4 cpd, and 1.2 cpd, improved significantly (OD: t=2.554, 2.785, 2.508, 2.982; OS: t=3.496, 3.148, 3.954, 2.786; all P 0.05). The signal-to-noise ratios of the icVEPs measured by OLED were significantly better than for LCD (OD: t=3.879; OS: t=2.981; both P<0.05). Conclusion Different displays have distinct effects on PVEP and icVEP. Strong visual electrophysiological signals were easier to evoke by OLED. It is necessary to set up a corresponding reference value for each display and to record the distinctions between them when analyzing the results of visual electrophysiological examinations. Key words: Visual evoked potential; Liquid crystal display; Organic light emitting diode