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Corneal biomechanical metrics by Scheimpflug camera in healthy eyes with refraction of -9.00 to +10.75 D in Brazilian patients

Poster Details

First Author: B.Valbon BRAZIL

Co Author(s):    R. Ambrósio Jr.   M. Alves           

Abstract Details



Purpose:

To determine the normal values from parameters derived by Corvis ST in healthy eyes from Brazilian patients. To correlate the corneal response to the NCT UHS Scheimpflug camera (Corvis ST) with CCT. To compare all parameters derived from Corvis ST between male and female.

Setting:

Grupo de Estudos de Tomografia e Biomecânica da Córnea do Rio de Janeiro_Brazil

Methods:

This observational and cross-sectional study comprised 119 eyes of 119 healthy Brazilian patients (67 females; 52 males and fifty-nine right and sixty left eyes). Each clinical examination consisted of best spectacle-corrected visual acuity, slit-lamp microscopy of the anterior and posterior segment, and Goldmann applanation tonometry (Haag-Streit, Koeniz, Switzerland), Pentacam tomographic evaluation (CCT) and Corvis ST measurements. The parameters from Corvis ST (Table 1) studied were : intraocular pressure (IOP), deformation amplitude (DA), 1st A Time, Highest Concavity Time (HC-time), 2nd A Time, 1st A Length (max), 2nd A Length(Max), Wing-Dist, Curvature Radius Highest Curvature (CRHC), Curvature Radius Normal (CRN), Maximum Velocity _Vin and Maximum Velocity _ Vout. Spherical equivalent refraction was obtained by dynamic refraction during clinical examination. Central corneal thickness (CCT) was assessed by the Pentacam. Statistical analysis was performed by using Bioestat version 5.0 software (Belém, PA, Brazil). Variables normally distributed of all data samples was con?rmed by the Kolmogorov-Smirnov test. Pearson correlation coefficient was utilized. Differences between data (male x female) were evaluated using the Student two-sample t test. A P value < .05 was considered statistically signi?cant.

Results:

Mean spherical equivalent refraction (SER) was -3.25 ± 3.39 D (range: -9.50 to +10.37 D). Mean CCT was 551.50 ±33.37 ṁm (range: 490 to 647 ṁm).Corvis ST and CCT were statistically significant (10 of 12), except HC-time and Curvature radius normal.Differences of parameters derived from Corvis ST between male and female were evaluated using the Student two-sample t test and were not statistically significant.

Conclusions:

Corneal biomechanical metrics by Corvis ST of healthy eyes were associated with CCT. There was no differences between male and female with this parameters in studied population. These measurements could be considered important parameters that would improve diagnosis and prognosis of corneal diseases and improve safety and efficacy of corneal surgery and glaucoma (IOP).

Financial Disclosure:

... research is funded, fully or partially, by a competing company

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