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Related Experiment Videos

Irlen lenses do not improve accommodative accuracy at near

K J Ciuffreda1, M Scheiman, E Ong

  • 1SUNY State College of Optometry, Department of Vision Sciences, New York, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 1, 1997
PubMed
Summary

Irlen lenses did not improve steady-state accommodation in successful users. This study found no significant difference in accommodation levels with or without filtered lenses, suggesting Irlen correction offers no near visual benefit.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Visual Science

Background:

  • Near accommodative dysfunction is a potential factor in patients using Irlen lenses.
  • Irlen lenses are spectrally broad-band filtered lenses.
  • Successful Irlen users were studied to assess visual function.

Purpose of the Study:

  • To determine the influence of Irlen lenses on steady-state accommodation.
  • To investigate if Irlen lenses impact near accommodative function in successful users.
  • To assess accommodative response with and without filtered lenses.

Main Methods:

  • Monocular steady-state accommodation was measured in six successful Irlen patients.
  • Accommodation was assessed using near blur stimuli (2, 3, and 4 D).

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  • Measurements were taken with nonfiltered and filtered spectacle corrections using a Hartinger coincidence optometer.

    • Main Results:

    • No significant difference in the mean level of accommodation was found between filtered and nonfiltered conditions.
    • A small but significant increase in accommodative variability was observed with filtered Irlen lenses.
    • Irlen correction did not positively affect monocular steady-state accommodation at near.

    Conclusions:

    • Irlen lenses do not enhance or improve near steady-state accommodation in successful users.
    • The study suggests that Irlen lenses do not alleviate potential near accommodative dysfunction.
    • Further research may be needed to explore other visual aspects potentially influenced by Irlen lenses.