Official ESCRS | European Society of Cataract & Refractive Surgeons

Visual acuity and ray tracing of near vision in patients withpPresbyopia with an intracornel micro lens

Session Details

Session Title: Refractive
Session Date/Time: Sunday 22/02/2015 | 08:30-11:00
Paper Time: 09:09
Venue: Sadirvan A
First Author: : V.Feingold USA
Co Author(s): :    I. Pallikaris   W. Brown   P. Stodulka        

Abstract Details


To report 3 and 6 months postoperative ray tracing analysis and manifest refraction outcomes after monocular presbia microlens, microlens (Presbia Cooperatief U.A., Amsterdam, Netherlands) implantation for the improvement in near vision in patients with presbyopia.


Gemini Eye Clinics, Czech Republic, University of Crete, Greece, Optilase, Dublin, Ireland and IDE in USA.


Patients between 40 and 65 years of age were evaluated for tolerance to monovision, and if accepting of monovision, scheduled for corneal microlens implantation in the non-dominant eye. 116 patients were emmetropic presbyopes; 21 patients underwent concurrent LASIK and corneal microlens implantation. In all cases, the microlens was implanted in a pocket created by a femtosecond laser at a depth of 300 ┬Ám. Pre and post-operative examinations of visual acuity for near and distance, and manifest refraction were assessed. In addition ray tracing before and after implantation were done using Itrace aberrometer in some patients.


Mean preoperative UCVA-near for patients was LogMAR 0.7, while at 3 months postoperatively, the mean was LogMAR 0.15. Ray tracing demonstrated that proper alignment with the lens position will result in good correlation with post op MRSE. There were no reports of central visual field defect.1.3% of patients underwent inlay explantation mainly due to neuroadaptation. When the ray tracing is misaligned with the implant the outcomes will generate erroneous values of cylinder and coma. The major changes to achieve better visual acuity after implantation were due to defocusing and increase in high order negative spherical aberrations.


The Presbia Microlens in this this study provided presbyopic patients with an improved near vision. Ray tracing demonstrated the principle mechanism of action and the optical characteristics of the microlens in the cornea.

Financial Disclosure:

One or more of the authors gains financially from product or procedure presented, One or more of the authors is employed by a for-profit company with an interest in the subject of the presentation

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