الفهرس 
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Abstract
Purpose: The aim is to evaluate the changes in anterior segment parameters following laser peripheral iridotomy by using Sheimpflug imaging system. Design: Cross-sectional, prospective interventional study. Participants: A total of 31 eyes with of 28 patients diagnosed to have primary narrow angle or angle closure glaucoma. Methods: All participants had LASER peripheral iridotomy to control IOP. Anterior chambers of the treated eyes were then evaluated using Scheimpflug images measuring different parameters of anterior chamber and angles. Main Outcome Measures: Evaluation of anterior chamber depth at different points (centeral & peripheral at 4 mm & 8 mm from center) and anterior chamber angle at 4 quadrants. Results: Mean Angular width had an average in degrees as following; superior mean angular width at 0º (22.99º), at 90º (23.01º), at 180º (23.94º), and at 270º was 23.12º before LPI. After LPI they increased to 25.8º, 25.9º, 26.24º, and 25.9º respectively. Mean pre LPI IOP was 19.48 (±4.42 mmHg) with 9 out of 31 eyes on topical medication whereas following LPI, mean IOP was 16.31 (±2.97 mmHg). LPI significantly increased PACD immediately and on intervals post iridotomy results stabilized but there was no influence on central ACD (p=>0.05). Significant PACD deepening and widening of ACA were observed with negligible change in CACD. Conclusions: PACS patients had more significant change in PACD at both 4 mm and 8 mm circles and ACA at all quadrants in comparison to both PAC and ACG patients. The Scheimpflug imaging system can evaluate PACD and ACA non invasively and easily and all parameters of the anterior ocular segment automatically, and has high reliability.