Corneal Topographic Astigmatism Based on Total Corneal Power Data (CorT Total): A Benchmark for Total Corneal Astigmatism. Issue 4 (April 2020)
- Record Type:
- Journal Article
- Title:
- Corneal Topographic Astigmatism Based on Total Corneal Power Data (CorT Total): A Benchmark for Total Corneal Astigmatism. Issue 4 (April 2020)
- Main Title:
- Corneal Topographic Astigmatism Based on Total Corneal Power Data (CorT Total)
- Authors:
- Alpins, Noel
Ong, James K. Y.
Randleman, J. Bradley
Nevyas-Wallace, Anita
Stamatelatos, George - Abstract:
- Abstract : Purpose: To evaluate how closely manufacturer-provided measures of total corneal astigmatism correspond with the manifest refractive cylinder, as compared to a benchmark of corneal topographic astigmatism calculated on the basis of measured total corneal power (TCP) data (CorT Total). Methods: The SD of the ocular residual astigmatism magnitude (ORAsd) was evaluated for normal virgin eyes based on an optimized benchmark CorT Total and the various measures of total corneal astigmatism provided by 3 different Scheimpflug tomographers. Results: The CorT Total corresponded with the manifest refractive cylinder at least as well as all the measures of total corneal astigmatism provided by the tomographers [Sirius CorT Total ORAsd: 0.320D (standard error [SE] 0.017D), Sirius TCP 4 mm ORAsd: 0.324D (SE 0.017D); Pentacam CorT Total ORAsd: 0.338D (SE 0.027D), Pentacam total corneal refractive power apex zone 4 mm ORAsd: 0.337D (SE 0.029D); Galilei CorT Total ORAsd: 0.472D (SE 0.068D), and Galilei TCP2 ORAsd: 0.536D (SE 0.124D)]. The difference between CorT Total and best measure on each tomographer was not statistically significant (Sirius TCP 4 mm: P = 0.24, Pentacam total corneal refractive power apex zone 4 mm: P = 0.64, Galilei TCP2: P = 0.24). Most of the manufacturer-provided measures did not correspond closely with the manifest refractive cylinder. When there were multiple measures of total corneal astigmatism, those derived from a zone with a diameter of 4.0 mmAbstract : Purpose: To evaluate how closely manufacturer-provided measures of total corneal astigmatism correspond with the manifest refractive cylinder, as compared to a benchmark of corneal topographic astigmatism calculated on the basis of measured total corneal power (TCP) data (CorT Total). Methods: The SD of the ocular residual astigmatism magnitude (ORAsd) was evaluated for normal virgin eyes based on an optimized benchmark CorT Total and the various measures of total corneal astigmatism provided by 3 different Scheimpflug tomographers. Results: The CorT Total corresponded with the manifest refractive cylinder at least as well as all the measures of total corneal astigmatism provided by the tomographers [Sirius CorT Total ORAsd: 0.320D (standard error [SE] 0.017D), Sirius TCP 4 mm ORAsd: 0.324D (SE 0.017D); Pentacam CorT Total ORAsd: 0.338D (SE 0.027D), Pentacam total corneal refractive power apex zone 4 mm ORAsd: 0.337D (SE 0.029D); Galilei CorT Total ORAsd: 0.472D (SE 0.068D), and Galilei TCP2 ORAsd: 0.536D (SE 0.124D)]. The difference between CorT Total and best measure on each tomographer was not statistically significant (Sirius TCP 4 mm: P = 0.24, Pentacam total corneal refractive power apex zone 4 mm: P = 0.64, Galilei TCP2: P = 0.24). Most of the manufacturer-provided measures did not correspond closely with the manifest refractive cylinder. When there were multiple measures of total corneal astigmatism, those derived from a zone with a diameter of 4.0 mm corresponded best with the manifest refractive cylinder. Conclusions: The CorT Total is a reliable benchmark measure that can be used to assess how well other measures of total corneal astigmatism correspond with the manifest refractive cylinder. … (more)
- Is Part Of:
- Cornea. Volume 39:Issue 4(2020)
- Journal:
- Cornea
- Issue:
- Volume 39:Issue 4(2020)
- Issue Display:
- Volume 39, Issue 4 (2020)
- Year:
- 2020
- Volume:
- 39
- Issue:
- 4
- Issue Sort Value:
- 2020-0039-0004-0000
- Page Start:
- Page End:
- Publication Date:
- 2020-04
- Subjects:
- corneal topographic astigmatism (CorT) -- corneal tomography -- total corneal power
Cornea -- Periodicals
Cornea -- Periodicals
Cornée -- Périodiques
617.719 - Journal URLs:
- http://journals.lww.com/corneajrnl/pages/default.aspx ↗
http://journals.lww.com ↗ - DOI:
- 10.1097/ICO.0000000000002162 ↗
- Languages:
- English
- ISSNs:
- 0277-3740
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 3470.927500
British Library DSC - BLDSS-3PM
British Library STI - ELD Digital store - Ingest File:
- 18734.xml