Corneal power measurement with Fourier-domain optical coherence tomography
Maolong Tang, Alex Chen, Yan Li, David Huang
Purpose: To study the accuracy and repeatability of anterior, posterior, and net corneal power measured by Fourier-domain optical coherence tomography (OCT). Setting: Doheny Eye Institute, Los Angeles, California, USA. Design: Cross-sectional study. Methods: A Fourier-domain OCT system (RTVue) was used to scan normal eyes, eyes after myopic laser in situ keratomileusis (LASIK), and keratoconic eyes. After the corneal surfaces were delineated, the system calculated anterior and posterior corneal powers by curve fitting over the central 3.0 mm diameter area. Net corneal power was calculated using a thick-lens formula. The repeatability of the calculations was evaluated by the pooled standard deviation of 3 measurements from the same visit. The net corneal power values were compared with standard automated keratometry measurements (IOLMaster). Results: The repeatability of Fourier-domain OCT net corneal power was 0.19 diopters (D), 0.26 D, and 0.30 D in the normal, post-LASIK, and keratoconus groups, respectively. The Fourier-domain OCT net corneal power was significantly lower than keratometry by a mean of -1.21 D, -2.89 D, and -3.07 D, respectively (P<.001). The anterior-posterior curvature ratio was lower in post-LASIK and keratoconic eyes than in normal eyes (P<.001). Conclusions: Corneal power measured by Fourier-domain OCT achieved good repeatability in all 3 groups. The repeatability was better than slower time-domain OCT systems. Because Fourier-domain OCT directly measures both anterior and posterior corneal surfaces, it may produce more consistent results than standard keratometry in post-LASIK and keratoconic eyes in which the anterior-posterior corneal curvature ratios are altered by surgery or disease. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned. Additional disclosures are found in the footnotes.
Journal of cataract and refractive surgery
https://doi.org/10.1016/j.jcrs.2010.07.018
10.1016/j.jcrs.2010.07.018
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Optical Coherence Tomography Medicine & Life Sciences 100%
Laser In Situ Keratomileusis Medicine & Life Sciences 72%
Psychological Power Medicine & Life Sciences 67%
Eye Medicine & Life Sciences 61%
Disclosure Medicine & Life Sciences 31%
Keratoconus Medicine & Life Sciences 18%
Los Angeles Medicine & Life Sciences 17%
Lenses Medicine & Life Sciences 13%
Tang, M., Chen, A., Li, Y., & Huang, D. (2010). Corneal power measurement with Fourier-domain optical coherence tomography. Journal of cataract and refractive surgery, 36(12), 2115-2122. https://doi.org/10.1016/j.jcrs.2010.07.018
Corneal power measurement with Fourier-domain optical coherence tomography. / Tang, Maolong; Chen, Alex; Li, Yan et al.
In: Journal of cataract and refractive surgery, Vol. 36, No. 12, 12.2010, p. 2115-2122.
Tang, M, Chen, A, Li, Y & Huang, D 2010, 'Corneal power measurement with Fourier-domain optical coherence tomography', Journal of cataract and refractive surgery, vol. 36, no. 12, pp. 2115-2122. https://doi.org/10.1016/j.jcrs.2010.07.018
Tang M, Chen A, Li Y, Huang D. Corneal power measurement with Fourier-domain optical coherence tomography. Journal of cataract and refractive surgery. 2010 Dec;36(12):2115-2122. doi: 10.1016/j.jcrs.2010.07.018
Tang, Maolong ; Chen, Alex ; Li, Yan et al. / Corneal power measurement with Fourier-domain optical coherence tomography. In: Journal of cataract and refractive surgery. 2010 ; Vol. 36, No. 12. pp. 2115-2122.
@article{54fcad803a8d436e801b4f649a2785a2,
title = "Corneal power measurement with Fourier-domain optical coherence tomography",
abstract = "Purpose: To study the accuracy and repeatability of anterior, posterior, and net corneal power measured by Fourier-domain optical coherence tomography (OCT). Setting: Doheny Eye Institute, Los Angeles, California, USA. Design: Cross-sectional study. Methods: A Fourier-domain OCT system (RTVue) was used to scan normal eyes, eyes after myopic laser in situ keratomileusis (LASIK), and keratoconic eyes. After the corneal surfaces were delineated, the system calculated anterior and posterior corneal powers by curve fitting over the central 3.0 mm diameter area. Net corneal power was calculated using a thick-lens formula. The repeatability of the calculations was evaluated by the pooled standard deviation of 3 measurements from the same visit. The net corneal power values were compared with standard automated keratometry measurements (IOLMaster). Results: The repeatability of Fourier-domain OCT net corneal power was 0.19 diopters (D), 0.26 D, and 0.30 D in the normal, post-LASIK, and keratoconus groups, respectively. The Fourier-domain OCT net corneal power was significantly lower than keratometry by a mean of -1.21 D, -2.89 D, and -3.07 D, respectively (P<.001). The anterior-posterior curvature ratio was lower in post-LASIK and keratoconic eyes than in normal eyes (P<.001). Conclusions: Corneal power measured by Fourier-domain OCT achieved good repeatability in all 3 groups. The repeatability was better than slower time-domain OCT systems. Because Fourier-domain OCT directly measures both anterior and posterior corneal surfaces, it may produce more consistent results than standard keratometry in post-LASIK and keratoconic eyes in which the anterior-posterior corneal curvature ratios are altered by surgery or disease. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned. Additional disclosures are found in the footnotes.",
author = "Maolong Tang and Alex Chen and Yan Li and David Huang",
doi = "10.1016/j.jcrs.2010.07.018",
journal = "Journal of Cataract and Refractive Surgery",
T1 - Corneal power measurement with Fourier-domain optical coherence tomography
AU - Tang, Maolong
AU - Chen, Alex
AU - Li, Yan
AU - Huang, David
N2 - Purpose: To study the accuracy and repeatability of anterior, posterior, and net corneal power measured by Fourier-domain optical coherence tomography (OCT). Setting: Doheny Eye Institute, Los Angeles, California, USA. Design: Cross-sectional study. Methods: A Fourier-domain OCT system (RTVue) was used to scan normal eyes, eyes after myopic laser in situ keratomileusis (LASIK), and keratoconic eyes. After the corneal surfaces were delineated, the system calculated anterior and posterior corneal powers by curve fitting over the central 3.0 mm diameter area. Net corneal power was calculated using a thick-lens formula. The repeatability of the calculations was evaluated by the pooled standard deviation of 3 measurements from the same visit. The net corneal power values were compared with standard automated keratometry measurements (IOLMaster). Results: The repeatability of Fourier-domain OCT net corneal power was 0.19 diopters (D), 0.26 D, and 0.30 D in the normal, post-LASIK, and keratoconus groups, respectively. The Fourier-domain OCT net corneal power was significantly lower than keratometry by a mean of -1.21 D, -2.89 D, and -3.07 D, respectively (P<.001). The anterior-posterior curvature ratio was lower in post-LASIK and keratoconic eyes than in normal eyes (P<.001). Conclusions: Corneal power measured by Fourier-domain OCT achieved good repeatability in all 3 groups. The repeatability was better than slower time-domain OCT systems. Because Fourier-domain OCT directly measures both anterior and posterior corneal surfaces, it may produce more consistent results than standard keratometry in post-LASIK and keratoconic eyes in which the anterior-posterior corneal curvature ratios are altered by surgery or disease. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned. Additional disclosures are found in the footnotes.
AB - Purpose: To study the accuracy and repeatability of anterior, posterior, and net corneal power measured by Fourier-domain optical coherence tomography (OCT). Setting: Doheny Eye Institute, Los Angeles, California, USA. Design: Cross-sectional study. Methods: A Fourier-domain OCT system (RTVue) was used to scan normal eyes, eyes after myopic laser in situ keratomileusis (LASIK), and keratoconic eyes. After the corneal surfaces were delineated, the system calculated anterior and posterior corneal powers by curve fitting over the central 3.0 mm diameter area. Net corneal power was calculated using a thick-lens formula. The repeatability of the calculations was evaluated by the pooled standard deviation of 3 measurements from the same visit. The net corneal power values were compared with standard automated keratometry measurements (IOLMaster). Results: The repeatability of Fourier-domain OCT net corneal power was 0.19 diopters (D), 0.26 D, and 0.30 D in the normal, post-LASIK, and keratoconus groups, respectively. The Fourier-domain OCT net corneal power was significantly lower than keratometry by a mean of -1.21 D, -2.89 D, and -3.07 D, respectively (P<.001). The anterior-posterior curvature ratio was lower in post-LASIK and keratoconic eyes than in normal eyes (P<.001). Conclusions: Corneal power measured by Fourier-domain OCT achieved good repeatability in all 3 groups. The repeatability was better than slower time-domain OCT systems. Because Fourier-domain OCT directly measures both anterior and posterior corneal surfaces, it may produce more consistent results than standard keratometry in post-LASIK and keratoconic eyes in which the anterior-posterior corneal curvature ratios are altered by surgery or disease. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned. Additional disclosures are found in the footnotes.
U2 - 10.1016/j.jcrs.2010.07.018
DO - 10.1016/j.jcrs.2010.07.018
JO - Journal of Cataract and Refractive Surgery
JF - Journal of Cataract and Refractive Surgery