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Interocular retinal nerve fiber layer thickness difference in normal adults.

Seung Woo Hong1, Seung Bum Lee2, Dong-hyun Jee2

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Comparing retinal nerve fiber layer (RNFL) thickness between eyes is crucial for diagnosing glaucoma. Fractional interocular RNFL thickness difference offers a more reliable diagnostic approach due to reduced influence from peak thickness locations.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Medical Imaging

Background:

  • Glaucoma diagnosis relies on detecting progressive retinal nerve fiber layer (RNFL) thinning.
  • Quantifying interocular RNFL thickness differences is essential for early glaucoma detection.

Purpose of the Study:

  • To determine the interocular retinal nerve fiber layer (RNFL) thickness difference in normal subjects.
  • To evaluate the utility of fractional versus absolute interocular RNFL thickness differences for diagnostic purposes.

Main Methods:

  • Peripapillary RNFL thickness was measured in 230 normal adults using Optical Coherence Tomography (OCT).
  • Mathematical correction for ocular cyclotorsion was applied to RNFL thickness profiles.
  • Fractional and absolute interocular RNFL thickness differences were calculated and analyzed across different subgroups.

Main Results:

  • Fractional interocular RNFL thickness differences showed less regional variability compared to absolute differences.
  • Mean fractional differences were 0.100 ± 0.077 (temporal) and 0.146 ± 0.105 (nasal).
  • Fractional differences identified smaller areas of variation across subgroups compared to absolute differences.

Conclusions:

  • Interocular fractional RNFL thickness differences exceeding 25% (5 points) or 35% (3 points) in the temporal area may indicate glaucoma.
  • Fractional interocular RNFL thickness comparison is a superior diagnostic method due to its lower sensitivity to peak thickness location variations.