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Morphology of the optic disc in the Tajimi Study population

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

Abstract

Purpose

To assess optic disc morphology and disc-fovea distance (DF)/mean disc diameter (DD) ratio and related factors in Japanese subjects in a population-based setting.

Methods

Digital fundus photographs obtained from 2634 subjects, comprising 87% of 3021 participants aged 40 years or older in the Tajimi Study, a population-based glaucoma survey, were analyzed planimetrically.

Results

The disc size averaged 2.28 mm2, the ovality (maximal/minimal disc diameter ratio) 1.12 and the DF/DD ratio 2.94. After adjusting for other systemic and ocular factors, the disc size was correlated with the spherical equivalent refraction (SE), the ovality and DF/DD ratio correlated negatively with the SE and disc size (P < 0.0001). These parameters did not differ significantly between 2095 ophthalmologically normal eyes and 58 eyes with open angle glaucoma (OAG). The angle of the long axis of the discs with ovality of >1.10 was between 91° and 120° in 53% of the subject eyes.

Conclusions

The reference data of disc morphology and DF/DD ratio in a Japanese population were obtained. SE showed significantly negative correlation with disc size, and disc size and SE showed significant negative correlation with ovality and DF/DD ratio. There was no significant difference between normal and OAG eyes evaluated by disc morphology and DF/DD ratio.

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Authors and Affiliations

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Correspondence to Naomi Mataki.

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Conflicts of interest

N. Mataki, None; A. Tomidokoro, Lecture fees (Alcon, Pfizer, Santen, Topcon), P (The license for image analyzing software was acquired by Topcon from the author); M. Araie, Consultant fees (Aerie, Alcon, Allergan, B&M, Heidelberg Engineering, Kowa, Pfizer, Santen, Senju, Topcon), Honoraria (Carl Zeiss Meditec, Nitten, Otsuka, Senju, Topcon), P (The license for image analyzing software was acquired by Topcon from the author); A. Iwase, Lecture fees (Alcon, Carl Zeiss Meditec, Kowa, Otsuka, Pfizer, Santen, Senju, Topcon), P (The license for image analyzing software was acquired by Topcon from the author).

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Mataki, N., Tomidokoro, A., Araie, M. et al. Morphology of the optic disc in the Tajimi Study population. Jpn J Ophthalmol 61, 441–447 (2017). https://doi.org/10.1007/s10384-017-0526-9

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  • DOI: https://doi.org/10.1007/s10384-017-0526-9

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