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Relationship between optic disc ovality and horizontal disc tilt in normal young subjects

  • Clinical Investigation
  • Published:
Japanese Journal of Ophthalmology Aims and scope Submit manuscript

Abstract

Purpose

To investigate the relationship between optic disc ovality and horizontal disc tilt.

Methods

The ovality index (the ratio of minimum to maximum disc diameter), horizontal and vertical optic disc tilt, and optic disc torsion were measured on the Heidelberg Retina Tomograph 3 printout in 381 right eyes of 381 normal young subjects. Stereophotographically obvious horizontal tilt and the relationship between the ovality index and horizontal tilt were determined in non-torted discs with an absolute value of disc torsion ≤15°.

Results

The median values of the ovality index, horizontal and vertical tilt, and disc torsion in all subjects were 0.92, 9.0°, 0.0°, and 0.0°, respectively. In the non-torted discs (205 eyes, 53.8 %), a horizontal tilt of ≥20° was stereoscopically obvious. The ovality index was significantly correlated with horizontal tilt (r = −0.276, P < 0.001). The area under the receiver operation curve for the ovality index to discriminate a disc with a horizontal tilt of ≥20° was 0.861. The horizontal disc tilt was significantly correlated with spherical equivalent (r = −0.369, P < 0.001) and axial length (r = 0.277, P < 0.001), but the ovality index was not.

Conclusions

Although the ovality index may be an indicator of stereoscopically obvious horizontal disc tilt, horizontal tilt is more closely related with myopia.

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Acknowledgments

The authors thank Goji Tomita, MD. PhD., for permission to use the software for measuring PPA parameters on the HRT images.

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Authors and Affiliations

  1. Department of Ophthalmology and Visual Science, Kanazawa University Graduate School of Medical Science, 13-1 Takara-machi, Kanazawa, 920-8641, Japan

    Hiroko Takasaki, Tomomi Higashide, Hisashi Takeda, Shinji Ohkubo & Kazuhisa Sugiyama

  2. Department of Sensory Science, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Kurashiki, Japan

    Hiroko Takasaki

Authors
  1. Hiroko Takasaki
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  2. Tomomi Higashide
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  3. Hisashi Takeda
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  4. Shinji Ohkubo
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  5. Kazuhisa Sugiyama
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Corresponding author

Correspondence to Tomomi Higashide.

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Takasaki, H., Higashide, T., Takeda, H. et al. Relationship between optic disc ovality and horizontal disc tilt in normal young subjects. Jpn J Ophthalmol 57, 34–40 (2013). https://doi.org/10.1007/s10384-012-0193-9

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  • DOI: https://doi.org/10.1007/s10384-012-0193-9

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