Comparing Binocular Defocus Curves With Monofocal, Monofocal With Mini-Monovision Versus Enhanced Monofocal Lenses.

To compare the binocular defocus curves following monofocal, monofocal lens with mini-monovision (difference of -0.75D) versus enhanced monofocal intraocular lenses (IOL).

Sussex Eye Hospital, University Hospitals Sussex NHS Foundation Trust, Brighton, United Kingdom.

A comparative observational study of three groups of patients aimed for mini-monovision with standard monofocal, monofocal IOL with mini-monovision versus enhanced monofocal IOL. All patients underwent immediate sequential bilateral cataract surgery. In the mini-monovision group, the dominant eye was aimed for distance emmetropia, and the other eye for -0.75D. Patients were followed up 3 months. The primary outcome was comparison of binocular defocus curves (between -2.5Dsph and 1.0Dsph adds) . Secondary outcomes included binocular uncorrected (UDVA), best corrected distance visual acuity (BCDVA) at 4 meters. 

Twenty-one patients were included in each group. There was no significant difference between the defocus curves between monofocal mini-monovision versus enhanced monofocal group between -1Dsph add to +0.5Dsph add (p>0.05). However, the defocus curve had broad landing zone with enchanced monofocal IOL. But there was a statistically significant difference between binocular defocus curves with monofocal lens Vs. mini-monovision (p<0.05) and enhanced monofocal (p<0.05) between -1Dsph add to +1.0Dsph add. There was no significant difference in binocular UDVA and BCDVA at 4 meters between all three groups (p>0.05).

Enhanced monofocals and mini-monovision with monofocal IOLs (-0,75D difference between eyes) gives similar binocular intermediate vision and this is significantly better compared to binocular monofocal IOL with distance corrections only.