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Pseudoaccommodation after an Implantation of a Conventional Posterior Chamber Intraocular Lense

1Gora F., 2Herrman W., 2Gabler B., 2Winkler von Mohrenfels C., 2Lohmann C.,
1Klinikum der Universität Regensburg, Augenklinik (Regensburg)
2Universität Regensburg, Klinik und Poliklinik für Augenheilkunde (Regensburg)

Purpose: The loss of accommodation ability in the elderly produces big interest to restore it while performing a cataractoperation. Lately, potentially accommodative lenses were developed, which lead to relative myopia by shifitng the lense forward due to contraction of the cillary muscle. Thus sharp pictures in the near can be projected on the retina. However there was no differentiation between a genuine accommodation and a pseudoaccommodation (spherical aberration or cillary muscle shifting), which we do observe with the usual non-accommodative intraocular lenses. In this study pseudoaccommodation is to be examined and quantified.
Method: 20 patients were included into the study, who underwent a planned cataract operation with an implantation of a conventional posterior chamber intraocular lense. Pre- and postoperative objective and best subjective refraction were measured. Visual acuity was determined by means of EDTRS boards at distances of 6, 4, 2 and 1 meter. Near visual acuity at 50 cm and 35 cm with distance correction and the accommodation width were obtained.
Results: The postoperative visual acuity between 0,6 and 1,25 could be achieved. The visual acuity at 35cm with best correction ranged from 0.2 to 0,8. The postoperative accommodation width amounted to 2.0 dpt on the average (1,0 -4.0 dpt).
Conclusions: In this study it could be shown that already by means of a non accommodative intraocular lense an accommodation up to 4 dpt (2.0 dpt on the average) can be achieved. In clinical studies with potentially accommodative intraocular lenses however the pseudoaccommodation must be subtracted from achieved total accommodation, in order to evaluate the success of such a lens.