Astigmatism induced by intraocular lens tilt evaluated via ray tracing
In: Journal of Cataract and Refractive Surgery, Jg. 44 (2018-06-01), S. 745-749
Online
unknown
Zugriff:
Purpose To evaluate astigmatism induced by aspheric and toric intraocular lens (IOL) tilt using a ray-tracing model. Setting Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA. Design Experimental study. Methods Ray-tracing eye models with aspheric IOLs (16.0 diopters [D], 22.0 D, and 28.0 D) and toric IOLs (16.0 D, 22.0 D, and 28.0 D each with toricities of 1.50 D, 3.75 D, and 6.00 D) were used. The IOLs were tilted from 1 to 10 degrees horizontally around a 90-degree vertical meridian. Toric IOLs were aligned at 90 degrees and 180 degrees to correct with-the-rule (WTR) and against-the-rule (ATR) corneal astigmatism, respectively. Astigmatism at the corneal plane induced by IOL tilt was calculated. Results Induced astigmatism increased with increasing IOL tilt and power. Horizontal tilt around a vertical meridian induced ATR astigmatism. For 5 degrees of tilt, induced astigmatism was 0.08 D, 0.11 D, and 0.14 D for 16.0 D, 22.0 D, and 28.0 D aspheric IOLs, respectively. Ten degrees of IOL tilt produced 0.33 D, 0.44 D, and 0.56 D of induced astigmatism for 16.0 D, 22.0 D, and 28.0 D aspheric IOLs, respectively. Tilting toric IOLs aligned at 90 degrees around a vertical meridian increased the magnitude of induced ATR astigmatism. Tilting toric IOLs aligned at 180 degrees decreased the magnitude of induced WTR astigmatism. Conclusions Tilting aspheric IOLs horizontally around a vertical meridian induced ATR astigmatism. Tilting toric IOLs aligned at 90 degrees increased ATR astigmatism, resulting in overcorrection. Tilting toric IOLs aligned at 180 degrees decreased WTR astigmatism, producing undercorrection.
Titel: |
Astigmatism induced by intraocular lens tilt evaluated via ray tracing
|
---|---|
Autor/in / Beteiligte Person: | Golla, Abhinav ; Wang, Li ; Weikert, Mitchell P. |
Link: | |
Zeitschrift: | Journal of Cataract and Refractive Surgery, Jg. 44 (2018-06-01), S. 745-749 |
Veröffentlichung: | Ovid Technologies (Wolters Kluwer Health), 2018 |
Medientyp: | unknown |
ISSN: | 0886-3350 (print) |
DOI: | 10.1016/j.jcrs.2018.04.035 |
Schlagwort: |
|
Sonstiges: |
|