This prospective study evaluated visual acuity and contrast sensitivity at different distances and under different lighting conditions in 20 patients who had the new AcrySof ReSTOR SN6AD1 implanted bilaterally.
Researchers compared six-month outcomes with the +3.00 D aspheric IOL to those obtained with the spherical and +4.0 D add aspheric lenses of the same model. At six months, the +3.00 D provided similar functional vision at far and near distances compared with the previous +4.0 D IOL, but it provided improved intermediate vision.
The mean binocular logMAR values were 0.126 at 50.0 cm, 0.036 at 60.0 cm, and 0.147 at 70.0 cm, with 100%, 75%, and 25% of patients, respectively, achieving 20/25 or better. In the authors' previous study of the +4.0 D spherical IOL, the respective mean values were 0.273, 0.356, and 0.401 and the respective percentages, 11%, 1%, and 0%. With the +4.0 D aspheric model, the authors' previous study found a mean value of 0.201 logMAR and 60.0 cm and 0.222 logMAR at 80.0 cm.
"It seems that the aspheric profile and lower add value of the aspheric IOL played an important role in the improvement in intermediate visual acuity," the authors write.
The +3.00 D aspheric IOL also provided good contrast sensitivity under photopic conditions, with worse performance under mesopic conditions. Incidence of visual disturbances was low, and the perceived visual phenomena reported with this IOL were similar to those reported with the spherical model.