Optical and Visual Quality of Phakic IOL at Different Sizes of Incision Surgery Using Adaptive Optics Visual Simulator
Purpose
To evaluate visual and optical quality of the Implantable Collamer Lenses (ICLs) for different powers and sizes of incision surgery.
Methods
The NIMO instrument was used to measure in vitro the wavefront aberrations of three ICL powers (-3, -6 and -15 diopters (D)). Afterwards, the adaptive optics visual simulator was used to simulate the ICL wavefront aberration’s pattern for small- and large-incision surgery in 11 observers at 3- and 5-mm pupil. Visual acuity (VA) and contrast sensitivity (CS) were measured and Modulation Transfer Function (MTF) and Point Spread Function (PSF) were calculated.
Results
At 3-mm pupil, no statistically significant differences were found between both incision sizes for any ICL power, except for -15D ICL at 25cpd (p<0.05). At 5-mm pupil statistically significant differences in VA and CS were found between both incision sizes for all ICL powers (p<0.05). Regarding to ICL power, at 3-mm pupil, no statistically significant differences were found in VA and CS, except between -3 and -15D at low-contrast VA and at 20 and 25cpd (p<0.05). At 5-mm pupil, no statistically significant differences were found in VA and CS between -3 and -6D ICL, but they did become apparent for -15D ICL for both incision sizes, all contrasts and spatial frequencies (p<0.05).
Conclusion
The ICLs provide good optical and visual quality results, better if implanted in small-incision surgical procedures, since the larger the incision size, the higher the HOAs that are induced. Optical and visual quality also decreases when ICL power increases, but these losses are offset by the effect of spectacle magnification.