Association between corneal biomechanical properties and optic nerve head morphology in newly diagnosed glaucoma patients

Association between corneal biomechanical properties and optic nerve head morphology in newly diagnosed glaucoma patients

Author Prata, Tiago S. Autor UNIFESP Google Scholar
Lima, Veronica C. Google Scholar
Guedes, Lia M. Google Scholar
Biteli, Luis G. Google Scholar
Teixeira, Sergio H. Google Scholar
Moraes, Carlos G. de Google Scholar
Ritch, Robert Google Scholar
Paranhos, Augusto Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Hosp Med Olhos
New York Eye & Ear Infirm
New York Med Coll
Abstract Background: To investigate the association between corneal biomechanics and optic nerve head morphology in newly diagnosed primary open-angle glaucoma patients. Design: Hospital based prospective study. Participants: Forty-two untreated newly diagnosed primary open-angle glaucoma patients. Methods: Patients underwent corneal hysteresis measurement using the Ocular Response Analyzer and confocal scanning laser ophthalmoscopy for optic nerve head topography evaluation. One eye was selected randomly for analysis. Data collected included age, race, gender, intraocular pressure and central corneal thickness. Main Outcome Measures: Multiple regression analysis (controlling for baseline intraocular pressure and disc area) was used to investigate factors associated with the following optic nerve head topographic parameters: linear cup-to-disc ratio and mean cup depth. Results: Mean age of participants was 66.7 +/- 11.8 years. Corneal hysteresis was the only factor significantly associated with both mean cup depth (correlation coefficient [r] = -0.34, P = 0.03) and cup-to-disc ratio (r = -0.41, P = 0.01). Central corneal thickness was significantly associated with mean cup depth (r = -0.35, P = 0.02), but not with cup-to-disc ratio (r = -0.25, P = 0.13). Although a trend towards a positive association between age and cup-to-disc ratio was identified (r = 0.26, P = 0.08), age was not significantly associated with mean cup depth (r = 0.06, P = 0.72). When comparing fellow eyes of patients with bilateral glaucoma, the eye with higher corneal hysteresis had smaller cup-to-disc ratio in 75% of the cases. Conclusions: in untreated newly diagnosed primary open-angle glaucoma patients, those with thinner corneas and mainly lower corneal hysteresis values had a larger cup-to-disc ratio and deeper cup, independently of intraocular pressure values and disc size.
Keywords corneal biomechanics
glaucoma
intraocular pressure
optic nerve head
Language English
Sponsor New York Glaucoma Research Institute, New York, NY
Date 2012-09-01
Published in Clinical and Experimental Ophthalmology. Hoboken: Wiley-Blackwell, v. 40, n. 7, p. 682-688, 2012.
ISSN 1442-6404 (Sherpa/Romeo, impact factor)
Publisher Wiley-Blackwell
Extent 682-688
Origin http://dx.doi.org/10.1111/j.1442-9071.2012.02790.x
Access rights Closed access
Type Article
Web of Science ID WOS:000309606000007
URI http://repositorio.unifesp.br/handle/11600/35255

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