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Interocular differences in optic disc topographic parameters in normal subjects.

D Gherghel1, S Orgül, C Prünte

  • 1University Eye Clinic Basel, Basel, Switzerland.

Current Eye Research
|May 12, 2000
PubMed
Summary
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This study found significant differences in optic disc topography between the right and left eyes in healthy individuals, particularly in retinal nerve fiber layer thickness. These interocular variations in optic disc measurements warrant consideration in clinical research.

Area of Science:

  • Ophthalmology
  • Optometry
  • Medical Imaging

Background:

  • Optic disc topography is crucial for diagnosing and monitoring various ocular conditions.
  • Understanding interocular symmetry or asymmetry in optic disc parameters is essential for accurate clinical assessments.

Purpose of the Study:

  • To investigate and quantify interocular differences in optic disc topography using confocal scanning laser ophthalmoscopy.
  • To determine if systematic variations exist between the right and left eyes in healthy subjects.

Main Methods:

  • Confocal scanning laser ophthalmoscopy (Heidelberg Retina Tomograph) was used to evaluate optic disc topography in 314 eyes of 157 healthy volunteers.
  • Measurements included disc area, cup area, cup volume, retinal nerve fiber layer thickness, and more, comparing right and left eyes.

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  • Statistical analysis, including Student t-test and Holm's correction, was applied to assess significance.

    • Main Results:

    • Significant interocular differences were observed in average retinal nerve fiber layer thickness and cross-section area, with the right eye generally showing lower values.
    • The left eye exhibited greater retinal nerve fiber layer thickness in 59.87% of subjects and larger cross-section area in 64.33%.
    • Significant differences were noted in the nasal optic disc area but not in the temporal area.

    Conclusions:

    • The study reveals systematic interocular differences in optic disc topometric data in healthy individuals.
    • These findings highlight potential methodological or biological factors influencing optic disc measurements.
    • Awareness of these interocular variations is important for interpreting results in clinical trials and practice.