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Orbscan Topography in Primary Open-Angle Glaucoma

Arranz-Marquez, Esther*; Bolivar, Gema*; Piñero, David P.; Konstas, Anastasios G.P.*; Mikropoulos, Dimitrios G.*; Teus, Miguel A.*

doi: 10.1097/OPX.0000000000000019
Original Articles

Purpose To compare anterior and posterior corneal curvatures between eyes with primary open-angle glaucoma (POAG) and healthy eyes.

Methods This is a prospective, cross-sectional, observer-masked study. A total of 138 white subjects (one eye per patient) were consecutively recruited; 69 eyes had POAG (study group), and the other 69 comprised a group of healthy control eyes matched for age and central corneal pachymetry with the study ones. Exclusion criteria included any corneal or ocular inflammatory disease, previous ocular surgery, or treatment with carbonic anhydrase inhibitors. The same masked observer performed Goldmann applanation tonometry, ultrasound pachymetry, and Orbscan II topography in all cases. Central corneal thickness, intraocular pressure, and anterior and posterior topographic elevation maps were analyzed and compared between both groups.

Results Patients with POAG had greater forward shifting of the posterior corneal surface than that in healthy control eyes (p < 0.01). Significant differences in anterior corneal elevation between controls and POAG eyes were also found (p < 0.01).

Conclusions Primary open-angle glaucoma eyes have a higher elevation of the posterior corneal surface than that in central corneal thickness–matched nonglaucomatous eyes.

*MD, PhD


Rey Juan Carlos Hospital, Móstoles, Madrid, Spain (EA-M); Novovision, Madrid, Spain (EA-M, MAT); “Príncipe de Asturias” Universitary Hospital, Madrid, Spain (GB, MAT); Department of Optics, Pharmacology and Anatomy, University of Alicante, Alicante, Spain (DPP); Foundation for the Visual Quality (FUNCAVIS), Alicante, Spain (DPP); 1st University, Department of Ophthalmology, AHEPA Hospital, Thessaloniki, Greece (AGPK, DGM); and University of Alcalá, Madrid, Spain (MAT).

Esther Arranz-Marquez Novovision Clínica Oftalmológica Paseo de la Castellana, 54 28046 Madrid Spain e-mail:

© 2013 American Academy of Optometry