Behaviour of the phakic iris-claw intraocular lens (Artisan /Verisyse) during accommodation: an optical coherence biometry study.

PURPOSE To evaluate variations in the position of the phakic iris claw lens (Artisan, Verisyse) and the natural crystalline lens during the accommodation process. METHODS We measured changes in position of the iris claw lens and the crystalline lens during the accommodation using optical coherence biometry (AC Master/Carl Zeiss Meditec, Germany) in 17 patients (28 eyes) with a phakic iris claw lens implanted for high myopia and/or myopic astigmatism. Accommodative effort was obtained using an internal optical target within the measuring device. RESULTS There was a forward shift of the phakic iris claw lens with a mean of 70 microm (8-178 microm) of the optical path length (OPL). At the same time the anterior pole of the natural lens showed a forward mean movement of 85 microm (4- 260 microm). CONCLUSIONS An anterior displacement of the iris-claw phakic lens was shown in a series of eyes during the accommodation process. As this displacement goes along with the forward displacement of the anterior pole of the crystalline lens, the preoperative measurement of the latter might provide some additional information about the position of the iris claw lens in the accommodative state after implantation.