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
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.
Keywords: Intraocular lens, Cataract, Phacoemulsification, Spherical aberration, Higher-order aberration