Angle Anatomy and Glaucoma in Patients With Boston Keratoprosthesis
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Date
2020
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Abstract
Purpose: To quantitatively analyze the angle anatomy in eyes with a Boston type 1 keratoprosthesis (KPro) using anterior segment optical coherence tomography (AS-OCT) and to assess the diagnostic ability of AS-OCT in KPro-associated glaucoma. Methods: AS-OCT (RTVue) images from KPro eyes with and without glaucoma were reviewed. The angle opening distance at 500 mu m from the scleral spur (AOD500), trabecular-iris angle at 500 mu m from the scleral spur (TIA500), and trabecular-iris surface area at 500 mu m from the scleral spur (TISA500) were measured by 2 observers masked to the diagnosis. The measurements for each visible quadrant were compared between KPro eyes with and without glaucoma. Results: Twenty-two eyes with glaucoma and 17 eyes without glaucoma from 39 patients with KPro were included. Of the 4 quadrants imaged, the temporal angle was the most visible (79.5%) and angle measurements of the temporal quadrant were the only ones that differentiated the 2 groups: the mean AOD500, TIA500, and TISA500 were significantly lower in KPro eyes with glaucoma than without glaucoma (388.2 +/- 234.4 mu m vs. 624.5 +/- 310.5 mu m,P= 0.02; 26.1 +/- 14.0 degrees vs. 39.1 +/- 17.1 degrees,P= 0.03; and 0.15 +/- 0.09 mm(2)vs. 0.23 +/- 0.12 mm(2),P= 0.03; respectively). The highest area under the receiver operating characteristic curve for detecting glaucoma was 0.75 for temporal TIA500 (95% confidence interval 0.57-0.94,P= 0.02) with 50% specificity at 80% of sensitivity and a cutoff value of 37 degrees. Conclusions: The temporal angle was the most visible on AS-OCT in eyes with a KPro. Significant narrowing of the temporal angle detected on AS-OCT was associated with glaucoma in these eyes.
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Keywords
Boston type I keratoprosthesis, Anterior segment optical coherence tomography, Anterior chamber angle anatomy, Glaucoma