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Visual field defects in normal-tension and high-tension glaucoma
M Araie1, J Yamagami, Y Suziki
1Department of Ophthalmology, University of Tokyo School of Medicine, Japan.
Ophthalmology
|December 1, 1993
Summary
Visual field defects in normal-tension glaucoma (NTG) and high-tension glaucoma (HTG) differ. NTG shows greater depression above the horizontal meridian, while HTG exhibits more diffuse visual field damage.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Visual Field Analysis
Background:
- Established differences in visual field characteristics between normal-tension glaucoma (NTG) and high-tension glaucoma (HTG) remain unclear.
- This study aimed to re-evaluate these differences using detailed pointwise analysis.
Purpose of the Study:
- To compare visual field characteristics between NTG and HTG patients.
- To identify specific patterns of visual field defects unique to each glaucoma type.
Main Methods:
- Included 68 NTG cases (max IOP ≤ 21 mmHg) and 62 HTG cases (max IOP ≥ 25 mmHg).
- Utilized Humphrey 30-2 program data for pointwise comparison of total deviation.
- Employed logistic discriminant analysis to differentiate disease type from disease stage.
Main Results:
- NTG demonstrated significantly more localized visual field depression above the horizontal meridian compared to HTG.
- HTG exhibited more diffuse visual field damage for a comparable level of overall visual field loss.
- Results were consistent across total deviation and normalized total deviation analyses.
Conclusions:
- Visual field defects in NTG and HTG are distinct.
- These differences suggest varying susceptibility of optic disc regions to damage in NTG versus HTG.