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PubMed · 16054998

Selective laser trabeculoplasty.

Mark A Latina·John Mark S de Leon
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Abstract

Selective laser trabeculoplasty (SLT) has been shown to be safe, well tolerated, and effective in intraocular pressure (IOP) reduction as therapy in several forms of open-angle glaucoma. The preservation of trabecular meshwork (TM) architecture and the demonstrated efficacy in lowering IOP make SLT a reasonable and safe alternative to argon laser trabeculoplasty (ALT). SLT may also be effective for cases of failed ALT and is a procedure that may also be repeatable, unlike ALT. SLT is also a simple technique for an ophthalmologist to learn as the large spot size eliminates the need to locate a particular zone of treatment on the TM. SLT has been demonstrated to be effective as primary treatment for open angle glaucoma and can be an effective adjunct in the early treatment of glaucoma. Furthermore, SLT can be considered as a primary treatment option in patients who cannot tolerate or who are noncompliant with their glaucoma medications, without interfering with the success of future surgery.

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GlaucomaHumansLaser TherapyTrabecular MeshworkTrabeculectomyJournal ArticleReview

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Mark A Latina, John Mark S de Leon. 2005. Selective laser trabeculoplasty.. https://doi.org/10.1016/j.ohc.2005.05.005

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PubMed2006

Do scleral flap dimensions influence reliability of intraocular pressure control in experimental trabeculectomy?

AIM: To compare the effect on intraocular pressure (IOP) of large vs small scleral flap size during trabeculectomy using adjustable sutures. METHODS: Trabeculectomy operations were performed on nine donor human eyes connected to a constant flow infusion with real-time IOP monitoring. Large scleral flaps (4 x 4 mm, 16 mm(2), n=12) or small scleral flaps (3 x 2 mm, 6 mm(2), n=9) were constructed over 0.76 mm(2) sclerostomies. For each procedure, equilibrium IOP was measured following tight closure with two four-throw adjustable 10-0 nylon sutures. RESULTS: Five scleral flaps were thin or poorly constructed; four of these were in the initial seven procedures, implying learning effect. These had a mean absolute IOP of 7.6 mmHg (range 2.7-12.4 mmHg) and mean relative IOP of 28.3% of baseline (range 10-45.8%) after closure. In the remaining 16 good quality procedures, mean IOP was 1.3 mmHg (range 0-3.4 mmHg) after sclerostomy, confirming minimal outflow resistance before closure. Following flap closure mean IOP was 20 mmHg (SD 4.4, range 15.5-29.3 mmHg) for large (n=8), and 18.7 mmHg (SD 3.6, 15.9-25.8 mmHg) for small (n=8) flaps (unpaired t-test, P=0.26). Mean IOP (% baseline) was 71.6% (SD 8.4, range 60.6-86.6%) and 66% (SD=12.7, 46.8-86.6%) for large and small flap groups, respectively (unpaired t-test, P=0.2). CONCLUSIONS: Well-constructed scleral flaps of both sizes were able to support an average IOP at least two-thirds of baseline, and both had similar absolute IOP levels. Errors in flap construction resulted in loss of IOP control. Smaller flap size does not appear to compromise control of early postoperative IOP using adjustable sutures.

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