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Eyelid pressure can alter corneal topography

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When the eyes look down or move laterally, eyelid pressure can alter corneal topography, a study shows.

Michael J. Collins, PhD, and colleagues studied the effects of eyelid pressure on corneal topography for different angles of gaze and eye movement conditions among 10 young people with healthy eyes. They measured the corneal topography of the right eye with a videokeratoscope before and after 15-minute visual tasks of downward gaze at 25° and 45°, both performed with either no eye movements or eye movements of 1 Hz. They conducted the four tasks on four separate mornings, according to the study.

Researchers found that the people studied showed significant regions of topographic change after the four tasks. “In general, eye movements were found to cause greater topographic changes than tasks without eye movements, and the larger angle of downward gaze led to greater changes in topography,” they said. “The topographic changes were located close to the lid margin position during each task.”

The study is published in the July issue of Eye & Contact Lens.