RT Journal Article
T1 Correlation Between Anterior Corneal Elevation Differences in Main Meridians and Corneal Astigmatism
A1 Batres Valderas, Laura
A1 Piñero, David Pablo
A1 Carracedo Rodríguez, Juan Gonzalo
AB Purpose: To assess the correlation between anterior corneal elevation (ACE) and anterior corneal astigmatism (ACA) obtained with two different topographers in healthy subjects at different corneal diameters. Methods: A retrospective, comparative, and observational study was conducted. Topography data from 305 patients obtained with the Oculus Pentacam (Oculus, Wetzlar, Germany) and Sirius (CSO, Florence, Italy) systems were collected. Subjects were divided into four groups depending on the magnitude of ACA. The ACE was evaluated in the principal meridians at 2, 3, and 4 mm from the corneal apex. The difference in ACE between meridians (ACE-M) and in superior-inferior and nasal-temporal semimeridians (ACE-SM) was calculated. Results: A strong positive correlation between ACE-M and ACA with both topographers was found for all corneal diameters (P<0.001). A linear equation to calculate the ACE-M differences as a function of the astigmatism at 8 mm of diameter was obtained: y=23.417x+1.40, where y is ACE-M in microns and x is ACA in diopters. Significant differences in ACE along SM were found for all groups studied according to the magnitude of ACA for the horizontal SM (P>0.001). The temporal meridian was more elevated at 4- and 6-mm diameters, and the nasal semimeridian was the most elevated for 8 mm. Conclusion: Anterior corneal astigmatism and elevation differences are strongly correlated, providing more corneal topography knowledge that could be applied in the contact lens fitting. A toric orthokeratology lens may be indicated in ACA greater than 0.75 D.
PB Contact Lens Association of Ophthalmologists, Inc.
SN 1542-2321
YR 2020
FD 2020-03
LK https://hdl.handle.net/20.500.14352/6127
UL https://hdl.handle.net/20.500.14352/6127
LA eng
NO Accepted March 11, 2019
DS Docta Complutense
RD 6 oct 2024