| Autor: |
Sepehr Feizi, Siamak Delfazayebaher, Vahid Ownagh, Fatemeh Sadeghpour |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Journal of Optometry, Vol 11, Iss 2, Pp 113-120 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
1888-4296 |
| DOI: |
10.1016/j.optom.2017.05.003 |
| Popis: |
Purpose: To evaluate the agreement between total corneal astigmatism calculated by vector summation of anterior and posterior corneal astigmatism (TCAVec) and total corneal astigmatism measured by ray tracing (TCARay). Methods: This study enrolled a total of 204 right eyes of 204 normal subjects. The eyes were measured using a Galilei double Scheimpflug analyzer. The measured parameters included simulated keratometric astigmatism using the keratometric index, anterior corneal astigmatism using the corneal refractive index, posterior corneal astigmatism, and TCARay. TCAVec was derived by vector summation of the astigmatism on the anterior and posterior corneal surfaces. The magnitudes and axes of TCAVec and TCARay were compared. The Pearson correlation coefficient and Bland–Altman plots were used to assess the relationship and agreement between TCAVec and TCARay, respectively. Results: The mean TCAVec and TCARay magnitudes were 0.76 ± 0.57 D and 1.00 ± 0.78 D, respectively (P |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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