Corneal topography and angle parameters after laser iridotomy combined with iridoplasty assessed by dual Scheimpflug analyzer
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To investigate the changes in corneal topography including parameters such as corneal curvature and corneal aberrations, along with anterior chamber angle (ACA) after laser iridotomy (LI) combined with peripheral iridoplasty (PI) using dual Scheimpflug analyzer.
In this prospective observational study, dual Scheimpflug analyzer images were acquired before and 1 week after LI plus PI. Corneal curvature of both axial and instantaneous maps from anterior and posterior surface, respectively, and total corneal power (TCP) were acquired. These corneal parameters from three zones (central, middle, and peripheral) and total corneal wavefront aberration, trefoil, and coma were obtained. The ACA from four quadrants, anterior chamber depth (ACD), anterior chamber volume (ACV), and intraocular pressure (IOP) were also inspected.
ACD increased significantly from 2.15 ± 0.25 to 2.18 ± 0.24 mm (P = 0.002). ACV and ACA from all four quadrants increased significantly after the laser treatment (all P < 0.05). IOP decreased significantly from 16.9 ± 3.1 to 14.7 ± 2.9 mmHg following LI plus PI (P = 0.000). No significant changes were detected in corneal axial and instantaneous curvature from three zones on the anterior and posterior corneal surface after LI plus PI (all P > 0.05). The TCP, total corneal wavefront aberration, trefoil, and coma also revealed no significant changes after the laser procedure (all P > 0.05).
Treatment with LI combined with PI did not affect the corneal topographic parameters from both anterior and posterior surfaces. However, LI plus PI improved ACA parameters significantly and effectively.
KeywordsAnterior chamber angle Laser iridoplasty Laser iridotomy Primary angle closure Dual Scheimpflug analyzer
We wish to express our gratitude to Hyunhee Lee, physician assistant, for assisting with data organization even though she may not qualify as an author.
Participation in study design (H.C., Y.P, J.P.); conduct of the study (H.C., S.K.); data collection, management, analysis, and interpretation of data (H.C., S.K., Y.P., J.P.); and preparation, review, and approval of the manuscript (H.C., S.K., Y.P., Y.H., J.P.).
There is no funding to report for this work.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interests.
The Ethics Committee of Gyeongsang National University Changwon Hospital approved the study protocol. The present study was approved by the University Hospital’s Institutional Review Board.
Written informed consent was obtained from all participants.
Consent for publication
- 7.Ritch R, Lowe RF (1996) Angle-closure glaucoma: mechanisms and epidemiology. In: Ritch R, Shields MB, Krupin T (eds) The glaucomas, 2nd edn. Mosby, St. Louis, pp 801–819Google Scholar
- 21.Ramakrishnan R, Mitra A, Abdul Kader M, Das S (2016) To study the efficacy of laser peripheral iridoplasty in the treatment of eyes with primary angle closure and plateau iris syndrome, unresponsive to laser peripheral iridotomy, using anterior-segment OCT as a tool. J Glaucoma 25:440–446CrossRefGoogle Scholar