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Relationship between the biomechanical properties of the cornea and anterior segment measurements
Souza, Murilo Barreto; de Medeiros, Fabricio Witzel; Villela, Flavio Fernandes; Alves, Milton Ruiz.
  • Souza, Murilo Barreto; Universidade de Sao Paulo. Hospital das Clinicas. Faculdade de Medicina. Sao Paulo. BR
  • de Medeiros, Fabricio Witzel; Universidade de Sao Paulo. Hospital das Clinicas. Faculdade de Medicina. Sao Paulo. BR
  • Villela, Flavio Fernandes; Universidade de Sao Paulo. Hospital das Clinicas. Faculdade de Medicina. Sao Paulo. BR
  • Alves, Milton Ruiz; Universidade de Sao Paulo. Hospital das Clinicas. Faculdade de Medicina. Sao Paulo. BR
Clinics ; 73: e491, 2018. tab, graf
Article in English | LILACS | ID: biblio-952791
ABSTRACT

OBJECTIVE:

To evaluate the relationship of biomechanical properties, corneal hysteresis and corneal resistance factor with age, sex and various corneal parameters measured with a Pentacam in normal subjects.

METHODS:

A total of 226 eyes from 113 patients were enrolled in this study. The subjects underwent Ocular Response Analyzer and Pentacam evaluations. A varying-intercept multilevel regression was implemented using Bayesian inference. The predictor variables were age, sex, central corneal thickness, corneal volume at a 7-mm diameter, anterior chamber angle and volume, anterior chamber depth, mean radius of the corneal curvature and corneal astigmatism.

RESULTS:

Corneal hysteresis ranged from 5.5 to 14.8 mmHg (mean 10.42±1.74 mmHg), and the corneal resistance factor ranged from 5.7 to 15.5 mmHg (mean 10.23±1.88 mmHg). No predictor variable other than gender and central corneal thickness had a significant correlation with either corneal hysteresis or corneal resistance factor. Corneal hysteresis was positively associated with female sex and with central corneal thickness, and corneal resistance factor was positively associated with central corneal thickness.

CONCLUSION:

Despite the associations found, only a small fraction of the variance in biomechanical measurements could be explained by the descriptors that were evaluated, indicating the influence of other corneal aspects on the biomechanical characteristics.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Cornea / Anterior Eye Segment Type of study: Prognostic study Limits: Female / Humans / Male Language: English Journal: Clinics Journal subject: Medicine Year: 2018 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade de Sao Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Cornea / Anterior Eye Segment Type of study: Prognostic study Limits: Female / Humans / Male Language: English Journal: Clinics Journal subject: Medicine Year: 2018 Type: Article Affiliation country: Brazil Institution/Affiliation country: Universidade de Sao Paulo/BR