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Related Experiment Videos

Processes involved in oculomotor adaptation to eccentric reading.

Angélica Pérez Fornos¹, Jörg Sommerhalder, Benjamin Rappaz

¹Ophthalmology Clinic, Department of Clinical Neurosciences, Geneva University Hospitals, Geneva, Switzerland.

Investigative Ophthalmology & Visual Science

|March 28, 2006

Summary

Normal subjects adapt to reading with a visual field restriction by first reducing vertical eye movements and then restructuring horizontal saccades for efficient text scanning.

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Area of Science:

Oculomotor control
Visual adaptation
Reading behavior

Background:

Eccentric viewing adaptation in central scotoma is poorly understood.
Oculomotor control adaptation to reading with visual field loss requires investigation.

Purpose of the Study:

Analyze oculomotor control adaptation stages.
Investigate adaptation to forced eccentric reading in normal subjects.

Main Methods:

Three normal adults trained to read with a restricted 10x7 degree viewing window.
Window stabilized at 15 degrees eccentricity in the lower visual field.
Gaze position recorded during 1 hour/day training for ~6 weeks.

Main Results:

Initial sessions showed inappropriate reflexive vertical saccades.

Related Experiment Videos

Vertical saccade count and amplitude decreased rapidly; horizontal saccade amplitude increased.

Progressive horizontal saccades and line jumps increased, while regressions decreased with training.

Conclusions:

Two adaptation phases identified: faster vertical suppression of foveation and slower horizontal restructuring.
Vertical phase: rapid reduction in vertical saccades and progressive adjustment.
Horizontal phase: amplitude adjustment of horizontal saccades and reduced regressions.