Evaluation of the Reading Performance of Extended-Depth of Focus IOL With Salzburg Reading Desk
Purpose
Clinical evaluation of a new extendend-depth of focus (EDOF) intraocular lens in terms of the visual performance at various distances, the reading performance on the Salzburg Reading Desk (SRD) as well as the depth of focus from the defocus curve.
Methods
In this ongoing prospective study 24 eyes of 12 patients have so far received the Tecnis Symfony, Abbott Medical Optics Inc.. 6 months postoperatively the following examinations were performed: Uncorrected and corrected distance visual acuity (UDVA, CDVA), uncorrected and distance corrected intermediate visual acuity (UIVA, DCIVA) and uncorrected and distance corrected near visual acuity (UNVA, DCNVA). The defocus curve was performed with the best distance correction. Furthermore the reading acuity at the preferred near and intermediate distances was calculated by the SRD with considerstion of the reading distance, speed and the print size. A subjective questionnaire was also performed.
Results
Results showed a median UDVA of 0.06 (0.44 to -0.14), a median CDVA of -0.06 logMAR (range: 0.02 to -0.16) and a median UNVA of 0.20 logMAR (range: 0.46 to 0.00) whereas median UIVA was 0.24 logMAR (range: 0.48 to 0.12). The improved performance at intermediate distance was confirmed by the SRD, which yielded an uncorrected reading acuity of 0.08 logMAR (range: 0.09 to -0.02) at a preferred intermediate distance of 65.50 cm (range: 62.7 to 67.0). The defocus curve showed an extended range of visual acuity 0.10 logMAR or better between 1.0 D and -1.5 D.
Conclusion
The new design of the extended-depth of focus IOL provides good postoperative functional results at far and intermediate distances as well as an improvement of the near visual acuity. Therefore patients reported a high rate of satisfaction and spectacle independence at the various distances.