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Abstract

PURPOSE: To evaluate the agreement between optic nerve head structural parameters obtained using swept-source optical coherence tomography and the Laguna ONhE software.
METHODS: This retrospective cross-sectional study included 353 eyes from healthy individuals, glaucoma suspects, ocular hypertensive patients, and patients with glaucoma. Optic nerve head parameters — including disc area, vertical and area cup-to-disc ratios, and rim volume — were measured using swept-source optical coherence tomography and Laguna ONhE. Agreement between methods was assessed using Bland–Altman analysis. A regression-based calibration model was developed for disc area measurements.
RESULTS: Laguna ONhE systematically underestimated disc area (p < 0.001) and cup-to-disc ratios (p<0.001) and overestimated rim volume (p=0.0002) compared with swept-source optical coherence tomography. After applying the calibration equation for disc area, agreement improved substantially, with no statistically significant bias (p=0.3).
CONCLUSION: Laguna ONhE provides structural estimates comparable with those obtained with swept-source optical coherence tomography after calibration, suggesting it may serve as a practical and cost-effective alternative for glaucoma evaluation.

Keywords: Glaucoma; Optic nerve head; Laguna ONhE; Optical coherence tomography; Agreement

Abstract

Myopia is a significant risk factor for glaucoma and a growing public health problem worldwide. Detecting glaucomatous changes in highly myopic eyes is diagnostically challenging due to the abnormal appearance of the optic nerve head. These patients also have a greater biomechanical susceptibility to pressure-induced glaucomatous damage. Refractive surgery has become increasingly popular, and many candidates for refractive surgery are myopic. Therefore, we sought to review the aspects of patient evaluation in those who have undergone refractive surgery for myopia concerned with the detection and monitoring of glaucoma development. We identified several important elements of patient evaluation for glaucoma after refractive surgery. These included the need for both structural and functional assessments before and after surgery, and the importance of monitoring for postoperative biomechanical changes in the cornea and their impact on intraocular pressure. We conclude that, in patients who undergo refractive surgery for myopia, it is essential to assess for the presence of glaucoma, to identify staging, and to plan for long-term control of the disease, regardless of IOP.

Keywords: Glaucoma; Intraocular pressure; Myopia; Refractive surgery