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  • Title: Quantitative assessment of changes in trabeculectomy blebs after laser suture lysis using anterior segment coherence tomography.
    Author: Sng CC, Singh M, Chew PT, Ngo CS, Zheng C, Tun TA, See JL, Ang M, Loon SC, Aung T.
    Journal: J Glaucoma; 2012; 21(5):313-7. PubMed ID: 21562432.
    Abstract:
    PURPOSE: To quantify changes in bleb morphology after laser suture lysis (LSL) using anterior segment optical coherence tomography (AS-OCT). PATIENTS AND METHODS: This was a prospective observational case series of patients who underwent trabeculectomy surgery with mitomycin-C and required subsequent LSL. Subjects were assessed before and immediately after LSL, and at 3 months after LSL. At each visit, a standardized cross-sectional AS-OCT image of the bleb was obtained, from which a masked observer measured bleb height (hB), cavity height (hC), wall cross sectional area (AW), cavity cross sectional area (AC), and bleb cross sectional area (AB) using custom software. RESULTS: Twenty-five subjects (25 eyes) were examined. LSL was performed at a mean of 21.5±16.3 days after trabeculectomy. Immediately after LSL, there was a significant increase in mean hB (P=0.026) and mean hC (P=0.45) from pre-LSL. At 3 months after LSL, there was a significant increase in mean hB (P=0.003), mean AC (P=0.047), and mean AB (P=0.006) as compared with before LSL. Increase in hB and hC immediately after LSL was predictive of outcome at month 3. CONCLUSIONS: AS-OCT was able to quantify changes in bleb morphology after LSL, some of which were predictive of eventual outcome.
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