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[Anterior ocular segment study with the Scheimpflug rotational camera in refractive surgery candidates]
Celina Murata1, Felipe Mallmann, Ester Yamazaki
1Setor de Cirurgia Refrativa, Departamento de Oftalmologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil. celmurata@yahoo.com.br
Purpose:
To analyze the anterior segment of refractive surgery candidates and establish the variability pattern in this population regarding corneal volume, anterior chamber volume and depth and corneal thickness, using the noncontact three dimensional analyzer Pentacam.
Methods:
A retrospective study of 297 eyes of 149 patients was conducted using Pentacam. According to the spherical equivalent value two groups were created, myopia (n=242 eyes) and hyperopia (n=55 eyes), to analyze the variables of corneal volume, anterior chamber volume and depth and corneal thickness.
Results:
The mean values of the myopia group were: corneal total volume 59.37 +/- 3.51 mm(3), corneal volume at 3 mm 3.87 +/- 0.23 mm(3), at 5 mm 11.31 +/- 0.67 mm(3), and at 7 mm 24.30 +/- 1.43 mm(3), anterior chamber volume 198.74 +/- 32.40 mm(3), anterior chamber depth 3.19 +/- 0.28 mm and corneal thickness 533.33 +/- 33.47 mm. In the hyperopia group, the mean total corneal volume was 60.77 +/- 3.31 mm(3), corneal volume at 3 mm from the apex was 4.01 +/- 0.20 mm(3), at 5 mm was 11.73 +/- 0.58 mm(3), and at 7 mm was 25.09 +/- 1.21 mm(3), the anterior chamber volume was 146.61 +/- 32.86 mm(3), the anterior chamber depth was 2.76 +/- 0.38 mm and the corneal thickness was 550.52 +/- 29.49 mm. The difference between the groups was significant for all variables (p<0.05).
Conclusion:
We observed in this study that patients with myopia had lesser mean corneal volume and pachymetry, and greater anterior chamber depth and volume compared with hyperopic patients.