Quality of vision with the Acri.Twin asymmetric diffractive bifocal intraocular lens system

Abstract

Asymmetric bilateral implantation of the Acri. Twin IOL gave good simultaneous distance and near vision with improved contrast sensitivity under photopic and mesopic conditions. Differences between monocular and binocular visual acuity and contrast sensitivity were obtained because of the distance-/near-weighted light distribution of Acri. Twin IOLs.

Visual Performance after AcrySof ReSTOR Aspheric Intraocular Lens Implantation

“…Two separate focal points along the optical axis are generated to provide good unaided distance and near vision as well as functional intermediate vision. Current designs of pseudoaccommodative IOLs use diffractive optics [1][2][3][4][5] , zones of differing refractive power [6][7][8][9] or both principles (hybrid IOLs) [10][11][12][13] . Recent studies performed on hybrid AcrySof ReSTOR IOL pointed out satisfactory visual results.…”

Refractive lens exchange with distance-dominant diffractive bifocal intraocular lens implantation

“…Jacobi et al [5] developed this new concept, asymmetrical bilateral multifocal IOL implantation to enhance visual performance of the multifocal IOL after binocular implantation. Alfonso et al [7] assessed the quality of vision in 343 patients who had implantation of asymmetric Acri.Twin bifocal diffractive IOLs, and reported that BCVA and BCNVA were 0.031±0.059 and 0.005±0.024 respectively. Similarly, Schmidinger et al…”

“…Safety and efficacy indexes obtained in the present study were slightly better than obtained after RLE and AcrySof ReSTOR implantation. And also, although this is not a comparative study of symmetric and asymmetric implantation, through symmetric implantation we can avoid the problems associated with the choice of the dominant eye [34,35] and this may solve binocular vision intolerance reported by some patients to different light distribution between eyes [7], which achieved equally good visual outcomes.…”

“…These diffractive IOLs allow the creation of the two foci, and can be made totally independent of pupil. However, some patients implanted with these IOLs may experience the perception of halos and glare at night [6,7,16].…”

“…The overlap of the in-focus and out-of-focus image can produce a decrease in contrast sensitivity and photic phenomena such as glare and halo, especially at night [3,4]. To reduce these effects, different light distribution between foci has been proposed [4][5][6][7]. The 447D IOL provides 70% of the available light energy for distance vision in the dominant eye, leaving 30% of the available energy for near focus.…”