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Related Experiment Videos

Wavefront analysis in eyes with accommodative spasm.

Sayuri Ninomiya1, Takashi Fujikado, Teruhito Kuroda

  • 1Visual Science, Osaka University Graduate School of Medicine, Osaka, Japan.

American Journal of Ophthalmology
|December 4, 2003
PubMed
Summary

Accommodative spasm in the eye causes negative spherical aberration. Treatment reverses this, shifting spherical aberration toward positive values, indicating a link between excessive accommodation and visual quality.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Visual Optics

Background:

  • Accommodative spasm is a condition where the eye's focusing muscle remains involuntarily contracted.
  • Spherical aberration is a type of optical aberration that affects image quality.

Observation:

  • This study examined four eyes from two patients diagnosed with accommodative spasm.
  • Ocular spherical aberration was measured using a Hartmann-Shack wavefront aberrometer in the central 4-mm zone.

Findings:

  • Eyes with accommodative spasm exhibited negative spherical aberration (mean -0.086 ± 0.026 µm).
  • Following treatment with cycloplegic agents or resolution of the spasm, spherical aberration values shifted towards positive (mean 0.025 ± 0.004 µm).

Implications:

Related Experiment Videos

  • Excessive accommodative tone is objectively measurable as negative spherical aberration.
  • Understanding these changes can aid in diagnosing and managing conditions related to accommodative dysfunction.
  • This research highlights the impact of accommodation on ocular aberrations and visual performance.