Vladimirov D. The influence of optical aberration on visual acuity

In this study, we follow the high order optical aberrations and their influence on visual acuity. To rich the goal, there was observed 248 patients. They were divided on 3 groups. 1st - persons with non impaired vision - healthy volunteers 98 persons (196 eyes). 2nd group (120 eyes) consisted from two subgroups. 2a subgroup (65 eyes) - patients after cataract surgery with spherical IOL implanted; 2b subgroup (55 eyes) - patients after cataract surgery with aspherical IOL implanted. 3rd group (30 eyes) - patients after cataract surgery with multifocal IOL implanted. We found correlation dependence of visual acuity values from WF RMS. The correlation coefficient is 0.4. Value of the WF RMS in eyes after implantation spherical IOL was 0,215µm (the width of the pupil was 3mm); after implantation of aspherical IOL 0,2µm (the width of the pupil was 3mm). Decrease the values of WF RMS after implantation aspherical IOL connected with the decrease of the contribution of the spherical aberration of the 4th order in the overall contribution of the influence of the investigated aberrations on visual acuity. The values of WF RMS of HO aberrations in eyes with multifocal IOL implanted was 0,2µm for far distance; 0,21µm for near distance; 0,2µm for intermediate distance (the width of the pupil was 3mm). There were established that "failure" effect - poor vision on intermediate distance - was caused by an increase of the LO aberrations, with almost the same values of the HO aberrations. In the experimental part of the study, we measured optical aberration of new accommodating IOL with changeable refractive surface. Obtained data were compared with data obtained from group 3. Using eye model we measured and compared aberrations, which was generated by spherical and aspherical IOL.