Noncorneal astigmatism related to poly(methyl methacrylate) and plate-haptic silicone intraocular lenses.
OBJECTIVE
To evaluate noncorneal astigmatism after implantation of a one-piece, plate-haptic silicone or one-piece poly(methyl methacrylate) PMMA intraocular lens (IOL).


METHODS
Klinik und Poliklinik für Augenheilkunde der Universität Regensburg, Germany.


METHODS
After a follow-up of at least 3 months, the degree of postoperative noncorneal astigmatism was calculated using the data from an auto refractometer. Sixty patients were evaluated: 30 with silicone IOLs (Group A) and 30 with PMMA lenses (Group B).


RESULTS
Mean noncorneal astigmatism in Group A was 0.78 diopter (D) +/- 0.51 (SD), which was statistically significantly higher than that in Group B (0.51 +/- 0.27 D) (P = .013). The highest noncorneal astigmatism, 2.32 D, occurred in Group A.


CONCLUSIONS
Based on these findings, we recommend noncorneal astigmatism be considered in eyes with a one-piece, plate-haptic silicone IOL and postoperative astigmatism. A prospective study with a standardized capsulorhexis size is needed to ascertain whether this IOL-related noncorneal astigmatism is caused by capsular shrinkage, which may then be treatable with a laser capsulotomy of the anterior capsule.
Spiegel
D
D
Widmann
A
A
Köll
R
R
D000368:Aged; D001251:Astigmatism / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007910:Lenses, Intraocular / Q000009:adverse effects*; D008297:Male; D019904:Polymethyl Methacrylate / Q000009:adverse effects*; D011183:Postoperative Complications / Q000209:etiology* / Q000503:physiopathology; D012029:Refraction, Ocular; D012189:Retrospective Studies; D012826:Silicone Elastomers / Q000009:adverse effects*
D012826:Silicone Elastomers; D019904:Polymethyl Methacrylate