Currently, no commercial perimeter device is available for infants (age, 0–12 months) to quantify the Visual Field Extent (VFE). Infants and children with neurological impairments are known to have visual field defects. It has been reported that in otherwise healthy individuals, visual field defects arising during infancy gets detected only in adulthood.
In clinical practice, visual fields of infants are typically assessed by bringing bright toys from the periphery and seeing if it attracts the infant's visual attention. Visual attention is determined by the clinician observing for meaningful eye and or head movements of the infant in the direction of the target. While this confrontational perimetry procedure is quick and easy, there exists no accurate objective quantification of this measurement (VFE).
We developed a device, Pediatric Perimeter, that quantifies visual field extent (VFE) for infants. Pediatric Perimeter is a hemispherical dome with light emitting diodes (LEDs). The LEDs are controlled using a computer program to measure Reaction Time (RT) to Gross Visual Fields (GVF) and the VFE. Infants lie down in the dome positioned in a dark room. Eye or head movement towards the stimuli is monitored with an infrared (IR) camera.