Factors influencing the experience of oscillopsia in infantile nystagmus syndrome

Investigative Ophthalmology & Visual Science
Kwang M ChamLarry A Abel

Abstract

Perceptual instability in infantile nystagmus syndrome (INS) has been reported occasionally. This study was conducted to examine the factors that influence perceptual stability in 18 individuals with INS. The subjects were instructed to look continuously at a fixation LED centered in an image (38 degrees x 32 degrees ) at two luminance levels (3.25 and 0.46 cd/m(2), with 21% and 96% contrast, respectively) throughout all trials. A trial consisted of the fixation LED on, followed by a peripheral LED on, and then both LEDs off. Subjects then reported what they perceived. Five trials were conducted per contrast image. Eye movements were recorded with a limbal tracker. After testing, each subject completed a questionnaire to determine whether they ever had or were presently experiencing oscillopsia. Sixteen of 18 subjects reported experiencing oscillopsia on the questionnaire. In the laboratory, the percentages of trials with perceptions of motion of the LED and background were as follows: neither, 45% to 60%; background only, 15% to 30%; both, approximately 15%; and LED only, approximately 10%. Over all trials, 14/18 and 13/17 subjects experienced oscillopsia for the low- and high-contrast images, respectively (i.e., four subjects...Continue Reading

Citations

Jul 18, 2009·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Zhong I Wang, Louis F Dell'Osso
Mar 31, 2012·European Journal of Paediatric Neurology : EJPN : Official Journal of the European Paediatric Neurology Society·Oliver Ehrt
Oct 23, 2014·The British Journal of Ophthalmology·Richard W HertleMichael Reed

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