Comparisons of Visual Acuity, Spherical Aberration and Contrast Sensitivity among Spheric, Aspheric ReSTOR(R), and Crystalens HD(R) Lenses

PURPOSE: To assess visual acuity, spherical aberration and contrast sensitivity in patients who were implanted with spheric, aspheric ReSTOR(R) or Crystalens HD(R) lenses. METHODS: The present study enrolled 16 patients (32 eyes) implanted with biliateral spheric ReSTOR(R) (four patients, spheric ReSTOR group), bilateral aspheric ReSTOR(R) (seven patients, aspheric ReSTOR group) or bilateral Crystalens HD(R) (five patients, Crystalens HD group) lenses. At three months postoperatively, visual acuity, spherical aberration, and contrast sensitivity were evaluated. RESULTS: Three months after surgery, there were no significant differences in uncorrected distant or intermediate visual acuity among the three groups. Uncorrected near visual acuity in the spheric and aspheric ReSTOR groups was superior to that in the Crystalens HD group, and the aspheric ReSTOR group had less spherical aberration. Mesopic contrast sensitivity in the Crystalens HD group was significantly higher at three cycles per degree compared to those in the spheric and aspheric ReSTOR groups. CONCLUSIONS: Uncorrected near visual acuity in the Crystalens HD group was inferior to those in the spheric and aspheric ReSTOR groups, but the mesopic contrast sensitivity of the Crystalens HD group at three cycles per degree was superior to those in the spheric and aspheric ReSTOR groups.

Combined Implantation of Monofocal and Multifocal Intraocular Lenses in Senile Cataract Surgery

PURPOSE: To assess binocular visual outcomes in patients who were implanted with a monofocal IOL (intraocular lens) in one eye and a multifocal IOL in the contralateral eye or with a bilateral multifocal IOL. METHODS: This study enrolled 15 patients (30 eyes) implanted with a monofocal IOL in one eye and a multifocal IOL in the contralateral eye (5 patients, group 1) or with a bilateral multifocal IOL (10 patients, group 2). Binocular visual acuity (uncorrected/best distance corrected near, intermediate, and distance vision), binocular uncorrected reading speed, and contrast sensitivity were assessed at 6 months following the last implantation. Patient's quality of life (overall satisfaction, halos and glare presence, and spectacle dependence) was also assessed using a questionnaire at 6 months postoperatively. RESULTS: There was significant difference in the uncorrected and corrected near visual acuity between the 2 groups in the mesopic condition. There was no significant difference in visual acuity, reading speed and contrast sensitivity in other conditions between the 2 groups. Spectacle dependence rate was 60% in group 1 and 20% in group 2. The glare symptom was present in 60% of patients in both groups and the halo symptom was present in 3 out of 10 patients in group 2. Overall satisfaction score was not significantly different between the groups. CONCLUSIONS: The combined implantation of a monofocal and a multifocal lens revealed similar visual outcomes compared to bilateral multifocal IOL implantation except for near vision. In addition, the results showed similar patient satisfaction in both groups.