Orbscan topography in primary open-angle glaucoma.
OBJECTIVE
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 †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
E
Arranz-Marquez
Gema
G
Bolivar
David P
DP
Piñero
Anastasios G P
AG
Konstas
Dimitrios G
DG
Mikropoulos
Miguel A
MA
Teus
D000328:Adult; D000368:Aged; D000959:Antihypertensive Agents / Q000627:therapeutic use; D003315:Cornea / Q000473:pathology*; D063171:Corneal Pachymetry; D019781:Corneal Topography; D003430:Cross-Sectional Studies; D004311:Double-Blind Method; D005260:Female; D005902:Glaucoma, Open-Angle / Q000188:drug therapy / Q000473:pathology*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014065:Tonometry, Ocular
D000959:Antihypertensive Agents