Multifocal IOL produces good vision at all distances for farsighted cataract patients, study says
August 3, 2009
Bilateral implantation of the Zeiss Acri.LISA 366D multifocal IOL (Carl Zeiss Meditec, Jena, Germany) produces a full range of vision and satisfactory visual acuity at all distances for cataract patients with pre-operative hyperopia, according to researchers at the University of Oviedo School of Medicine in Oviedo, Spain.
Acri-LISA bifocal IOL study: Design and methods
The researchers implanted the Zeiss Acri.LISA multifocal intraocular lens (IOL) in both eyes of 85 farsighted cataract patients.
The patients were divided into two groups, based on their amount of pre-operative hyperopia: a low-to-moderate hyperopia group and a high hyperopia group.
At six months after surgery, the following measurements were taken:
- Best spectacle-corrected distance visual acuity (BSCVA)
- Best distance-corrected near visual acuity (BCNVA)
- Best distance-corrected intermediate visual acuity (VA)
- Distance contrast sensitivity (CSF) under bright and medium-low light conditions
Acri-LISA bifocal IOL study: Results
Results of the study from data gathered six months after surgery included:
- Mean monocular BSCVA was between 20/20 and 20/25 in both the low-to-moderate hyperopia group and the high hyperopia group.
- Mean binocular BSCVA was 20/20 in both groups.
- Mean monocular BCNVA was 20/20 in both groups.
- Both groups had similar post-operative contrast sensitivity in both bright and medium-low light conditions.
Acri-LISA bifocal IOL study: Conclusions
The researchers concluded that bilateral implantation of the Zeiss Acri.LISA 366D multifocal IOL in patients with low, moderate and high hyperopia produces a full range of vision and satisfactory visual acuity at distant, intermediate and near reference points.
Further studies are needed to confirm these results and to determine the degree of spectacle independence achieved by people who receive bilateral implantation of this and other multifocal IOLs.