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Biomechanical properties in healthy subjects with and without refractive errors. A comparative study
Author(s) -
DEL BUEY MA,
CRISTOBAL BESCOS JA,
LAVILLA L,
ASCASO FJ,
MATEO OROBIA A,
JIMENEZ B,
RUIZ DE GOPEGUI E,
PALOMINO C
Publication year - 2010
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2010.3322.x
Subject(s) - ophthalmology , medicine , intraocular pressure , refractive error , astigmatism , cornea , corneal topography , optometry , eye disease , optics , physics
Purpose To determine in vivo corneal biomechanical properties in patients without refractive errors and patients with moderate‐high myopic and hyperopic spherical refractive errors. Methods A comparative study was carried out to measure Corneal Hysteresis (CH, mmHg) and Corneal Resistance Factor (CRF, mmHg) of 384 eyes of 201 patients classified in four groups. Moderate myopia (< 6 D, n=203), high myopia (> 6 D, n=43), moderate‐high hyperopia (> 2 D, n=62), and emetropic group (n=76). Corneal compensated intraocular pressure (IOPcc),and Goldman correlated intraocular pressure (IOPg) were also studied. Central corneal thickness (CCT, microns) was measured by ultrasonic pachymetry. Patients with ocular pathology or astigmatism greater than the spherical refractive error were not considered. A multiple‐comparison analysis was made to establish differences among the groups. Results Mean values were: CH= 10.59±1.52, CRF= 10.52±1.69 and CCT= 556.3 for the moderate myopia group, CH=10.04 ±1.55, CRF=10.23 ±1.82 and CCT=543.75 for the high myopia group, CH=11.16 ±1.88, CRF=10.69 ±2.07 and CCT=555.43 for the hyperopia group, CH=10.66 ±1.30 , CRF=10.48±1.14 and CCT=558.10 for the control group. Although these results of the biomechanical parameters showed higher values corresponding to the hyperopia group and lower to the myopia group, these differences were not statistically significant. Conclusion CH and CRF are greater in hyperopic patients in comparison with myopic and emetropic eyes. We do not find statistical significant differences between moderate myopia and high myopia. There are significant differences in CH between the high myopia and the hyperopia groups.