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Session Title: Imaging II
Session Date/Time: Monday 07/10/2013 | 16:30-18:00
Paper Time: 17:20
Venue: Main Lecture Hall (Ground Floor)
First Author: : N.Reus THE NETHERLANDS
Co Author(s): : R. van der Heijde V. Sicam
To evaluate the relationships between objective refractive cylinder and anterior as well as total corneal cylinder measured with a Scheimpflug, a LED topography and a Purkinje analyzer
The Rotterdam Eye Hospital, Rotterdam, the Netherlands
40 pseudophakic eyes, with spherical monofocal intraocular lenses (IOLs), of 35 patients were measured with Pentacam, Cassini, Lenstar LS 900 and Topcon automated refractor (AR). Radial curvature values of anterior (Pentacam, Cassini, Lenstar) and Posterior (Pentacam) corneal surfaces were derived. Ray-tracing was used to determine the astigmatic aberrations Zernike Z(2,-2) and Z(2,2) within a 3-mm zone diameter in order to calculate total corneal cylinder with anterior and posterior surfaces data by Pentacam and anterior keratometry values by both Cassini and Lenstar and posterior surface data by Pentacam. The relationship between corneal refractive cylinder was determined with linear regression analysis.
Average spherical equivalent refractive error (SD, range) was -0.51 (1.15, -4.63 - +0.75). Average (SD) median objective refractive cylinder was -0.92 diopters (D) (0.68) @ 101.20 (47.3). Average median anterior cylinder was -0.81(0.53) @ 107.2 (59.1) for Pentacam, -1.00 (0.61) @ 103.6 (45.9) for Cassini and -0.97 (0.83) @ 108.7 (55.0) for Lenstar. Average (SD) median total cylinder was -0.90 (0.55) @ 107.0 (48.2) for Pentacam, -1.32 (0.77) @ 105.5 (49.7) for Cassini/Pentacam and -1.07 (0.87) @ 106.2 (46.6) for Lenstar/Pentacam. The R2 (slope) values of linear regression analysis between magnitude of corneal and refractive cylinder were 0.16 (0.32) for Pentacam anterior corneal cylinder, 0.20 (0.36) for Pentacam total corneal cylinder, 0.61 (0.70) for Cassini cylinder, 0.57 (0.87) for Cassini/Pentacam total corneal cylinder, 0.62 (0.96) for Lenstar cylinder, and 0.65 (1.04) for Lenstar/Pentacam total corneal cylinder. For the relationship between axis of corneal and refractive cylinder, R2 (slope) was 0.61 (0.97) for Pentacam anterior surface, 0.47 (0.70) for Pentacam total corneal power, 0.78 (0.89) for Cassini anterior cylinder, 0.66 (0.89) for total corneal cylinder with Cassini/Pentacam, 0.77 (1.02) for Lenstar anterior cylinder, and 0.87 (0.92) for total corneal cylinder with Lenstar/Pentacam.
The relationship between corneal cylinder and objective refractive cylinder strengthens for magnitude as well as for axis when both anterior and posterior corneal surface measurements are taken into account. In cataract surgery, posterior corneal astigmatism may thus be important to consider, especially when using toric IOLs.
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