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Blinking and tear break-up during four visual tasks.

Nikole L Himebaugh1, Carolyn G Begley, Arthur Bradley

  • 1Indiana University School of Optometry, Bloomington, Indiana 47405, USA. nhimebau@indiana.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|January 22, 2009
PubMed
Summary

Dry eye patients experience more discomfort due to reduced blinking and increased tear film break-up during visual tasks. This study links blinking patterns and tear film stability to ocular symptoms in both normal and dry eye subjects.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Human Physiology

Background:

  • Dry eye disease is a prevalent condition characterized by ocular discomfort.
  • Understanding the relationship between visual tasks, blinking behavior, and tear film integrity is crucial for managing dry eye symptoms.

Purpose of the Study:

  • To investigate the interplay between blinking patterns, tear film break-up, and ocular symptoms.
  • To compare these factors in individuals with and without dry eye during various visual tasks.

Main Methods:

  • Sixteen dry eye and sixteen control subjects performed four distinct visual tasks.
  • Blink patterns and tear film dynamics were recorded using video imaging.
  • Ocular irritation symptoms were assessed via questionnaires before and after tasks.

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Main Results:

  • Dry eye subjects exhibited a higher blink rate and increased tear film break-up, particularly centrally and superiorly.
  • Both groups reduced blinking during demanding visual tasks like gaming or letter identification.
  • Dry eye subjects reported more intense ocular symptoms and showed increased corneal staining post-task.

Conclusions:

  • Reduced and incomplete blinking, coupled with compromised tear film stability, contributes to ocular discomfort.
  • These findings highlight the impact of visual tasks on tear film health and symptom severity, especially in dry eye patients.