Irlen lenses do not improve accommodative accuracy at near.
The purpose of the experiment was to determine the influence of Irlen lenses on steady-state accommodation in successful users, as there is speculation that near accommodative dysfunction may be a factor in these patients. Monocular steady-state accommodation in six successful Irlen patients was assessed for near blur stimuli (2, 3, and 4 D) either with nonfiltered spectacle refractive correction or their spectrally broad-band filtered spectacle refractive correction. Accommodation was measured subjectively using a Hartinger coincidence optometer. There was no significant difference in mean level of accommodation between the two conditions. Additionally, there was a small but significant increase in accommodative variability with the filtered prescription. The use of Irlen correction did not have any positive effect on monocular steady-state accommodation at near.
Ciuffreda
K J
KJ
SUNY State College of Optometry, Department of Vision Sciences, New York, USA.
Scheiman
M
M
Ong
E
E
Rosenfield
M
M
Solan
H A
HA
D000065:Accommodation, Ocular / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D003116:Color; D005139:Eyeglasses; D005260:Female; D005374:Filtration; D006801:Humans; D008297:Male; D009907:Optometry / Q000379:methods; D011897:Random Allocation; D014786:Vision Disorders / Q000503:physiopathology / Q000628:therapy*; D014792:Visual Acuity