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Spontaneous eyeblink activity under different conditions of gaze (eye position) and visual glare

  • Neurophthalmology
  • Published:
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Abstract

Purpose

To further evaluate the spontaneous eyeblink rate (SEBR) of healthy adult human subjects according to direction of gaze, especially in the presence of bright light reflective glare.

Methods

On 32 subjects aged between 18 and 24 years, separate video recordings of 5 min duration were made with different conditions of gaze (horizontal, slightly upwards or slightly downwards) under normal lighting or a distant lighting glare source.

Results

The SEBR in primary eye gaze under normal lighting was 11.7 +/− 0.9 eyeblinks/min with a coefficient of variation (COV) of 20.5 %. A non-significant decrease in SEBR was noted with downward gaze, but a slight significant increase with upward gaze in both SEBR (to 13.0 +/− 1.1 eyeblinks/min) and COV (average 26.1 %). In the presence of glare, SEBR in primary eye gaze increased significantly (p < 0.001) to 14.4 +/− 1.3 eyeblinks/min, with an obvious time-related progressive increase (p < 0.001). On upward gaze in the presence of a glare stimulus, SEBR progressively increased even further (average 15.0 +/− 2.4 eyeblinks/min; p < 0.001), as did the COV (to 29.2 %).

Conclusions

The results indicate that spontaneous eyeblink activity in silence can be affected by the presence of a glare light source, especially if the subjects are looking slightly upwards. This scenario should be avoided, if at all possible, in assessments of spontaneous eyeblink activity.

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Acknowledgments

The author would like to thank Drs. Taher Naase, Emil Oblak, and Mohamed Laquizzaman for assistance with some of the initial recordings for this study. The author has no proprietary interests in any of the protocols or instrumentation used in the present study.

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Authors and Affiliations

  1. Department of Vision Sciences, Glasgow Caledonian University, Cowcaddens Road, Glasgow, G4 OBA, UK

    Michael J. Doughty

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  1. Michael J. Doughty
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Correspondence to Michael J. Doughty.

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Doughty, M.J. Spontaneous eyeblink activity under different conditions of gaze (eye position) and visual glare. Graefes Arch Clin Exp Ophthalmol 252, 1147–1153 (2014). https://doi.org/10.1007/s00417-014-2673-8

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  • DOI: https://doi.org/10.1007/s00417-014-2673-8

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