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Examination of Low-Luminance Myopia with a Laser Optometer

  • E. Ingelstam
  • K. Janson
  • D. Epstein
  • B. Tengroth
Conference paper
  • 204 Downloads
Part of the Springer Series in Optical Sciences book series (SSOS, volume 31)

Abstract

With a simple version of a laser optometer, Fig. 1, which enables testing of accommodation at photopic, mesopic and scotopic luminance levels (120 cd m−2, 0.5 cd m−2 and 0.001 cd m−2, respectively), low-luminance myopia studies were performed on about 400 eyes. This method has numerous advantages over previously used techniques. The most important are these: since the speckles produced by constructive and destructive interference of reflected laser light, the sharpness of its retinal image is independent of the focus of the eye; the pattern per se does not serve as an accommodative stimulus [1, 2, 3]; and the subject, being asked to evaluate the direction of the movement of the speckles, cannot relate this movement to the direction or amplitude of accommodation and is thus unable to influence the result. Also, the superimposing of the speckle pattern onto the subject’s visual field causes only minimal interference with the ongoing task.

Keywords

Speckle Pattern Refractive State Ongoing Task Optical Correction Myopia Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Ingelstam E and Ragnarsson S I 1972. Vision Res. 12, 411–420CrossRefGoogle Scholar
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    Charman W N and Chapman D 1980. The Ophthalmic Optician 20, 41–51Google Scholar
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    Epstein D, Ingelstam E, Jansson K and Tengroth B. Acta Ophthalmologica, (in print)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1982

Authors and Affiliations

  • E. Ingelstam
    • 1
  • K. Janson
    • 1
  • D. Epstein
    • 2
  • B. Tengroth
    • 2
  1. 1.Institute of Optical ResearchThe Royal Institute of TechnologyStockholmSweden
  2. 2.Department of OphthalmologyKarolinska HospitalStockholmSweden

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