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Myopic Shift during Hyperbaric Oxygenation Attributed to Lens Index Changes.

Knut Evanger1, Barbara K Pierscionek, Guro Vaagbø

  • 1*MSc †PhD ‡MD §MD, PhD Institute of Clinical Medicine, University of Bergen, Bergen, Norway (KE, OHH); Faculty of Science Engineering and Computing, Kingston University, Kingston-upon-Thames, United Kingdom (BKP); Hyperbaric Medicine Unit, Department of Occupational Medicine, Haukeland University Hospital, Bergen, Norway (GV, ET); Department of Clinical Science, University of Bergen, Bergen, Norway (ET); and Department of Ophthalmology, Haukeland University Hospital, Bergen, Norway (OHH).

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|September 29, 2015
PubMed
Summary

Hyperbaric oxygen therapy can cause a temporary myopic shift due to changes in the eye's lens refractive index. This study found no structural changes in the lens after treatment.

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Area of Science:

  • Ophthalmology
  • Hyperbaric Medicine
  • Optics

Background:

  • Hyperbaric oxygen (HBO) therapy is used for various medical conditions.
  • Some patients undergoing HBO therapy experience transient myopic shifts and potential cataract-related changes.

Purpose of the Study:

  • To investigate ocular lens changes during HBO therapy.
  • To understand the mechanisms behind myopic shifts and cataract development in patients receiving HBO.

Main Methods:

  • Scheimpflug imaging of the crystalline lens.
  • Measurements of scattered light, objective refraction, and axial length.
  • Data collected before and after 19 days of HBO therapy.

Main Results:

  • A significant decrease in lens nucleus optical density and backward scattered light was observed.
  • A mean myopic shift of -0.58 diopters occurred.
  • No significant changes were found in cortical optical density, forward scattered light, or other measured lenticular and ocular parameters.

Conclusions:

  • The transient myopic shift during HBO therapy is likely due to alterations in the lens's refractive index.
  • No significant changes in lens curvature or thickness were detected post-treatment.