Comparison Of Visual Quality Between Eyes Implanted With Monofocal And Bifocal Intraocular Lenses With Prior Myopic Lasik/Prk

To compare vision and visual quality of eyes implanted with monofocal or bifocal intraocular lens (IOL) with prior myopic LASIK/PRK.

Qingdao Eye Hospital of Shandong First Medical University, Refractive Cataract Department, Qingdao, China

In this prospective study, the Barrett true-K embedded in biometers and American Society of Cataract and Refractive Surgery average formulas were used to calculate IOL power for patients with prior myopic LASIK/PRK. Thirty eyes of sixty patients were implanted with monofocal or bifocal IOLs, respectively. Visual acuity, refraction, corneal and ocular aberrations, ocular scatter index (OSI), and quality of vision questionnaire (QoV) were evaluated three months postoperatively.

The mean monocular UDVA, UNVA, refractive prediction error (RPE) and OSI in monofocal and bifocal IOL groups was 0.097±0.072 logMAR, 0.58±0.124 logMAR, -0.42±0.41D, and 2.293±0.913, respectively, whereas 0.087±0.078 logMAR, 0.307±0.117 logMAR (P<0.001), -0.39±0.45D, and 2.447±0.802, respectively. Percentage of eyes achieved RPE within ±0.50D in monofocal and bifocal IOL groups was 67% and 73%, respectively. There's no statistical significance in corneal and ocular aberration comparison between groups (all P>0.05). The median QoV scores for frequency, severity and bothersome subscales in monofocal and bifocal IOL groups were 39.67, 32.05, and 30.59, respectively, whereas 43.76 (P=0.025), 32.05 (P=0.141), and 41.62 (P=0.517), respectively.

Bifocal IOL is a safe option to get good visual outcomes for selected patients with prior myopic LASIK/PRK. However, patients complained about dysphotopsia (especially haloes) more often than patients with monofocal IOLs.