A Comparison of Reading Performance in Patients Implanted with the Tecnis ZMA00 and AT LISA 802 Multifocal Intraocular Lenses

• Autores: Werner W. Hütz, Jürgen Kerbs, Peter C. Hoffmann, Ina Conrad-Hengerer, Fritz Hengerer
• Localización: Journal of Emmetropia: Journal of Cataract, Refractive and Corneal Surgery, ISSN-e 2171-4703, Vol. 2, Nº. 2, 2011, págs. 65-71
• Idioma: inglés
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• Resumen

  • PURPOSE: To evaluate and compare reading performance under bright and low-light conditions following the implantation of two different multifocal intraocular lenses (IOLs).

    METHODS: Randomized, prospective study. Thirty cataract patients (60 eyes) were randomly assigned for implantation with either the Tecnis ZMA00 (AMO) (Group 1, 15 patients) or the AT LISA 802 (Zeiss) (Group 2, 15 patients) IOL. Patients’ reading ability (visual acuity, reading speed) was assessed 12 weeks postoperatively under low-light (6 cd/m2) and bright-light conditions (100 cd/m2). Contrast sensitivity (CS) and refractive results were also analyzed.

    RESULTS: Twelve weeks postoperatively, under low-light conditions, patients in Group 1 had a mean binocular reading speed of 135.9±29.8 words per minute (wpm) while Group 2 had 106.1±29.8 wpm (p=0.007). Under bright-light conditions, reading speeds were 165.9±25.8 and 148.4±31.8 wpm in Groups 1 and 2 respectively. CS results revealed comparable contrast levels in both groups under bright-light conditions, but superior levels in Group 1 under low-light conditions, with a statistically significant difference at the highest spatial frequency (18 cpd, p=0.046). Visual acuity results revealed no statistically significant differences between the two groups, but significantly better spherical correction was achieved in Group 1 (p=0.004).

    CONCLUSION: While outcomes in visual acuity and reading performance in bright-light conditions were comparable in the two groups, in low-light conditions patients in Group 1 achieved significantly superior reading speeds and better CS at the highest spatial frequency.

    This suggests that overall reading performance was significantly better with the Tecnis ZMA00 than with the AT LISA 802.