Correlation Between Anterior Corneal Elevation Differences in Main Meridians and Corneal Astigmatism. Issue 2 (March 2020)
- Record Type:
- Journal Article
- Title:
- Correlation Between Anterior Corneal Elevation Differences in Main Meridians and Corneal Astigmatism. Issue 2 (March 2020)
- Main Title:
- Correlation Between Anterior Corneal Elevation Differences in Main Meridians and Corneal Astigmatism
- Authors:
- Batres, Laura
Piñero, David
Carracedo, Gonzalo - Abstract:
- Abstract : 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 inAbstract : 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. … (more)
- Is Part Of:
- Eye & contact lens. Volume 46:Issue 2(2020)
- Journal:
- Eye & contact lens
- Issue:
- Volume 46:Issue 2(2020)
- Issue Display:
- Volume 46, Issue 2 (2020)
- Year:
- 2020
- Volume:
- 46
- Issue:
- 2
- Issue Sort Value:
- 2020-0046-0002-0000
- Page Start:
- Page End:
- Publication Date:
- 2020-03
- Subjects:
- Corneal astigmatism -- Corneal elevation -- Orthokeratology
Contact lenses -- Periodicals
Intraocular lenses -- Periodicals
Orthokeratology -- Periodicals
Anterior segment (Eye) -- Diseases -- Periodicals
617.7523 - Journal URLs:
- http://journals.lww.com/claojournal/pages/default.aspx ↗
http://journals.lww.com ↗ - DOI:
- 10.1097/ICL.0000000000000613 ↗
- Languages:
- English
- ISSNs:
- 1542-2321
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 3854.587000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 22288.xml