Visagraph

Visagraph

 [ve´zah-graf]
trademark for a device that records and measures eye movements while the patient is reading.

Visagraph

[ve′zah-graf]
a trademark for a device that records and measures eye movements while the patient is reading.
References in periodicals archive ?
Chapters cover the significance of eye movements during silent reading, how to use the Visagraph (R) Eye Movement Recording System to gather data on individual eye movements, use of the Visagraph in schools or clinics, uses of eye movement recording and reading appraisals, and more.
He outlines the skills of the fundamental reading process; the history of eye-movement recording; the use of the Visagraph Eye-Movement Recording system, including selecting the reading test level, interpreting the reports, reading simulations, and graphs; the use of eye movements for reading appraisal; field use of the Visagraph system in schools, clinics, and optometry settings; comparisons to the EyeLink system in terms of data; and the 2010 Visagraph Norm Study Report, which analyzed how today's eye movement norms compare to a 1960s study.
The Visagraph goggles employ two infrared sensors for each eye that respond to changes in reflected light from the darker and lighter portions of the eye as ocular rotations are executed.