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Differences in neuroretinal rim area between low tension glaucoma and primary open angle glaucoma Junkichi Yamagami 1,2 , Shiroaki Shirato 2 , Makoto Araie 2 , Tetsuya Yamamoto 3 1Dept of Ophthalmol Tokyo Metropolitan Geriatric Hosp 2Dept of Ophthalmol, Tokyo Univ 3Dept of Ophthalmol, Yamanashi Med Coll pp.1391-1394
Published Date 1989/9/15
DOI https://doi.org/10.11477/mf.1410210948

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  • Abstract
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We quantitated the neuroretinal rim area of the optic disc in 15 eyes with low-tension glaucoma (LTG) and 13 eyes with primary open angle glau-coma (POAG). All the eyes manifested visual field defects localized in the superior or inferior hemi-sphere only when measured by automated per-imetry using central 30-2 program by Humphrey. The peak value of intraocular pressure during the follow-up period averaged 18.9±1.7 mmHg for the LTG group and 29.3±5.5 mmHg for the POAG group. There were no significant differences between the two groups concerning age, state of refraction or severity of visual field defect.

we used magnified prints of the fundus photo-graph in color to estimate the optic disc and the neuroretinal rim. We determined the ratio of the rim area to the disc area (rim-disc ratio) for the whole disc, the superior and inferior half of the disc. We observed that the rim-disc ratio corresponding to the still intact hemisphere to be significantly greater in POAG than LTG (p<0.05). This finding seemed to suggest that the rim area of the optic disc is narrower in LTG than POAG before the visual field defects become manifest. The finding also seemed to imply that different mechanism may be involved in pathogenesis of optic nerve damage between LTG and POAG.


Copyright © 1989, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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