Philippine Journal of Ophthalmology (Jun 2008)

Comparison in the quality of vision and spherical aberration between spherical and aspheric intraocular lenses

  • Robert T. Ang, MD,
  • Gladness A. Martinez, MD,
  • Jesse B. Caguioa, OD,
  • Karen B. Reyes, MD

Journal volume & issue
Vol. 33, no. 1
pp. 9 – 12

Abstract

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Objective: This study compared the quality of vision and spherical aberration (SA) in eyes implanted with spherical and aspherical intraocular lenses (IOL). Methods: Twenty-two patients (44 eyes) with bilateral cataracts were included in a prospective, comparative, randomized clinical study to receive either Alcon IQ aspheric or Natural IOL in either eye. Three-month postoperative evaluation included uncorected (UCVA) and best-corrected visual acuity (BCVA), and contrast sensitivity under photopic and mesopic conditions. Results: In the IQ group, UCVA was at least 20/20 in 45% and 20/40 in 85% of the eyes. High-contrast BCVA was at least 20/16 in 36%, 20/20 in 95%, and 20/40 in 100% of eyes. In the Natural group, UCVA was at least 20/20 in 35% and 20/40 in 95% of eyes. High-contrast BCVA was 20/16 in 40%, at least 20/20 in 95% and 20/25 in 100% of eyes. Mean spherical equivalent was –0.15 ± 0.6D in the IQ and –0.25 ± 0.6D in the Natural. The mean SA in the IQ was significantly lower than in the Natural (0.15 µm vs. 0.49 µm; p < 0.001). Mean total higher-order aberration was significantly lower in the IQ vs. the Natural (0.58 µm vs. 0.75 µm; p = 0.03). Contrast sensitivity under photopic and mesopic conditions did not show a significant difference between the groups. Conclusion: UCVA, high-contrast BCVA, and contrast sensitivity at 3 months were comparable between eyes implanted with IQ and Natural IOL. Mean spherical and total higher-order aberrations were significantly lower in the IQ group.

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