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Posterior chamber IOL implantation may induce with-the-rule astigmatic shift

Br J Ophthalmol. 2009;93:1648-1651.

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A posterior chamber phakic IOL may induce surgically related astigmatism and a shift to with-the-rule astigmatism, according to a study.

According to a study of 73 eyes of 47 patients undergoing implantation with the Visian implantable Collamer lens (STAAR Surgical) posterior chamber phakic IOL, corneal astigmatism increased from 1.10 D at an axis of 89.9° at baseline to 1.44 D at an axis of 90.6° 3 months after surgery as measured by the ARK-700A (Nidek) automated keratometer.

Using ATRAS995 (Carl Zeiss Meditec) corneal topography, corneal astigmatism increased from 1.16 D at an axis of 90.5° to 1.45 D at an axis of 90.2°. However, manifest astigmatism was reduced from 0.93 D at an axis of 93.2° to 0.72 D at an axis of 87.4°.

Surgically induced astigmatism was 0.45 D at an axis of 93.3° using the keratometer and 0.49 D at an axis of 98.0° using corneal topography.