| Comparison between Optic Disc Torsion of Fellow Eyes in Unilateral Normal-tension Glaucoma and Normal Eyes. |
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Jin Ho Joo, Jeong Han Choi, Tae Gi Kim, Jaheon Kang |
1Department of Ophthalmology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea. Kjh0614@khu.ac.kr
2Division of Ophthalmology, Department of Medicine, Kyung Hee University Graduate School, Seoul, Korea. |
| 편측 정상안압녹내장의 반대편 눈과 정상인의 눈과의 시신경 유두 기울기와 비틀림 비교 |
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주진호1⋅최정한2⋅김태기1⋅강자헌1 |
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경희대학교 의학전문대학원 강동경희대학교병원 안과학교실1, 경희대학교 대학원 의학과 안과학교실2 |
Correspondence:
Jaheon Kang,
Email: Kjh0614@khu.ac.kr
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Received: 26 May 2017 • Revised: 27 June 2017 • Accepted: 2 August 2017 |
| Abstract |
PURPOSE
To determine the association between optic disc tilt and torsion of glaucomatous and fellow eyes of unilateral normal-tension glaucoma (NTG) patients and normal. METHODS: We measured optic disc tilt and torsion of 23 unilateral NTG patients and 23 normal controls by analyzing fundus photography and compared 3 groups. We also measured retinal nerve fiber layer (RNFL) thickness through optical coherence tomography in 23 unilateral NTG patients and compared the findings with those of normal eyes. RESULTS: The mean values of optic disc tilt ratio and torsion degree in glaucomatous eyes were 1.17 ± 0.19° and 15.57 ± 8.16°, respectively, while those in fellow eyes were 1.10 ± 0.10° and 8.26 ± 5.20°. There was no significant difference in tilt ratio (p = 0.109), but there was a significant difference in torsion degree (p = 0.001). The mean values of optic disc tilt ratio and optic disc torsion in the controls were 1.11 ± 0.07° and 3.25 ± 2.69°, respectively. Also, there was no significant difference in optic disc tilt ratio (p = 0.601), but a significant difference in optic disc torsion between fellow eyes and controls (p < 0.001). The RNFL thickness of the same torsion direction in unilateral NTG eyes was measured to be 49.35 ± 17.18 µm smaller than the normal value (mean RNFL thickness: 71.91 ± 16.92 µm). Reduced RNFL thickness of the same torsion direction between glaucomatous eyes and fellow eyes was significantly different (p < 0.001). In addition, it was confirmed that RNFL thickness was significantly decreased according to the degree of disc torsion (p = 0.024). CONCLUSIONS: The optic disc torsion showed a significant difference between glaucomatous and fellow eyes in unilateral NTG patients and normal controls. Also, the RNFL thickness significantly decreased according to the degree of the optic disc torsion. Therefore, fellow eyes of unilateral NTG patients need to be carefully monitored for the progression of glaucoma. |
| Key Words:
Optic disc torsion;Retinal nerve fiber layer;Unilateral normal tension glaucoma |
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