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Scientific correspondence
Comparison of localised nerve fibre layer defects in normal tension glaucoma and primary open angle glaucoma
  1. S J Woo1,
  2. K H Park1,2,
  3. D M Kim1,2
  1. 1Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea
  2. 2Seoul Artificial Eye Center, Seoul National University Hospital Clinical Research Institute
  1. Correspondence to: Ki Ho Park, MD, Department of Ophthalmology, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea; kihopark{at}snu.ac.kr

Abstract

Aim: To compare the pattern of localised nerve fibre layer (NFL) defects in normal tension glaucoma (NTG) and primary open angle glaucoma (POAG).

Methods: 50 NTG eyes and 36 POAG eyes, all with localised NFL defects, were enrolled. On retinal NFL photography, the proximity of the defect to the centre of the fovea (angle α) and the sum of the angular width of the defects (angle β) were determined. Angle α was the angle made by a line from the centre of the fovea to the disc centre and a line from the disc centre to the disc margin, where the nearest border of the defect met. The patterns of localised NFL defects in NTG and POAG were compared with angles α and β. Independent t test was used for statistical analysis.

Results: Angle α in NTG (35.1 (SD 20.0)°) was significantly smaller than that of POAG (45.9 (21.9)°) (p=0.02), while angle β in NTG (49.0 (31.9)°) was significantly larger than that of POAG (33.1 (23.9)°) (p=0.01).

Conclusions: The pattern of NFL defects in NTG was different from that in POAG. Localised NFL defects in NTG were closer to the fovea and wider in width than those in POAG.

  • nerve fibre layer defects
  • normal tension glaucoma
  • primary open angle glaucoma

https://doi.org/10.1136/bjo.87.6.695

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    Footnotes

    • No financial support or interest was received in the preparation of this manuscript.