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RAFAEL FREIRE Kobayashi, Maria Flavia Ribeiro, Flavio E Hirai, Eliane Nakano, Claudia Francesconi, Mauro Campos; Corneal Thickness in Individuals with Myopia. Invest. Ophthalmol. Vis. Sci. 2014;55(13):1538.
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To evaluate corneal thickness across corneal meridians in individuals with myopia
One hundred and fifteen individuals had both eyes evaluated. Examinations included refraction and corneal thickness measured by Pentacam and Oculyzer. Myopes were categorized as low (spherical equivalent between zero and -3.00); moderate (-3.00 to -6.00); and severe (higher than -6.00). Corneal thickness were evaluated 2, 4 and 6mm from the central corneal thickness in the axis of 0,45,90,135,180, 225, 270 and 315 degrees. (Figure 1) Corneal thickness were compared across groups and corneal meridians with repeated measures ANOVA to adjust for the correlation between eyes. All p-values < 0.05 were considered statistically significant.
There is no statistically significant difference in corneal thickness between low, moderate and severe myopes in each axis. Corneal thickness on the inferior meridians (225, 270 and 315 degrees) are thinner compared to the superior meridians (45, 90 and 135 degrees) for low and moderate myopes (p<0,05).
Corneal thickness did not differ between different levels of myopia. However, the pachymetric map showed thinner corneas in the inferior meridians when compared to pachimetry in the upper half of the cornea.
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