Abstract
Purpose
Corneal biomechanics, reflecting structural vulnerabilities of the eyeball, may participate in the pathogenesis of unilateral normal-tension glaucoma. This study investigated the pathophysiology of unilateral normal-tension glaucoma using Corvis ST (OCULUS Optikgeräte GmbH) and other ocular characteristics.
Methods
Eighty-three patients with normal-tension glaucoma with unilateral visual field loss and structurally unaffected fellow eyes and 111 healthy controls were included in this prospective study. Dynamic corneal response parameters, intraocular pressure measured by rebound tonometry, central corneal thickness, and axial length were assessed on the same day. Measurements were compared between affected eyes, unaffected fellow eyes, and control eyes. Risk factors for normal-tension glaucoma and unilateral involvement were the main outcome measures.
Results
A shorter first applanation time (adjusted odds ratio, 0.061; 95% confidence interval, 0.018–0.215) and a larger peak distance (adjusted odds ratio, 4.935; 95% confidence interval, 1.547–15.739) were significant risk factors for normal-tension glaucoma and were associated with greater glaucoma severity (both P < 0.001). Axial length (adjusted odds ratio, 29.015; 95% confidence interval, 4.452–189.083) was the predominant risk factor for unilateral involvement in patients with normal-tension glaucoma.
Conclusion
The eyes with normal-tension glaucoma were more compliant than healthy eyes. Axial elongation-associated optic nerve strain may play an important role in unilateral normal-tension glaucoma with similar corneal and scleral biomechanics in both eyes.
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Acknowledgements
The authors acknowledge the statistical assistance provided by the Centre of Statistical Consultation and Research in the Department of Medical Research, National Taiwan University Hospital.
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All procedures used in this study were approved by the Ethics Review Board of the National Taiwan University Hospital, and adhered to the tenets of the Declaration of Helsinki.
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Chen, YY., Wang, TH., Huang, JY. et al. Relationship of axial length and corneal biomechanical properties with susceptibility to unilateral normal-tension glaucoma. Graefes Arch Clin Exp Ophthalmol 260, 255–264 (2022). https://doi.org/10.1007/s00417-021-05346-2
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DOI: https://doi.org/10.1007/s00417-021-05346-2