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R.C. Becker, E. Kirchner-Pauli, W. Schmidt; Implantation of Multifocal Intraocular Lenses with Asymmetrical Light Distribution . Invest. Ophthalmol. Vis. Sci. 2003;44(13):258.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: The Twin-Set Acrisil®737D / 733D (Acri.Tec, Germany) represents multifocal, diffractive, foldable intraocular silicone lenses with asymmetrical light distribution for bilateral implantation. The concept of asymmetrical light distribution (737D: 70% for far-focus and 30% for near-focus for implantation in the first eye; 733D: 30% for far-focus and 70% for near-focus for implantation in the second eye) wants to achieve simultaneous distance and near vision with improved contrast sensitivity and binocular vision compared to symmetric multifocal intraocular lenses. Methods: 16 patients (age 72.8 ± 5.6 years) underwent bilateral implantation (clear-corneal phacoemulsification) of the Twin-Set Acrisil®737D / 733D within 6 weeks. Before cataract surgery, on the first day, second and sixth week of follow -up, distance- and near -visual acuity assessment and testing of random dot stereopsis with the Lang stereotest were performed. Reexaminations including contrast sensitivity assessment (Pelly-Robson-charts) were performed 6 and 12 months after cataract surgery. Patients were questioned for postoperative spectacle usage. Results: Distance visual acuity (737D/733D, mean): no correction 0.62/0.58, with correction 0.91/0.86 (preoperatively 0.52/0.48); Near visual acuity: no correction 0.63/0.67, with correction 0.63/0.80 (preoperatively 0.61/0.54), with distance correction 0.65/0.66. The mean spherical equivalent (737D/733D) after 12 months was -0.10±0.85/ 0.56±0.42. Contrast sensitivity (737D/733D, logarithm of the reciprocal of contrast threshold): distance: bright 1.60/1.65, half-light 1.52/1.56; near: bright 1.51/1.55, half-light 1.48/1.51. All patients showed normal binocular vision. Glare/ colour perception was reported in 3/ 2 cases. Only 1 patient reported the use of spectacles postoperatively. There were no complications during or after surgery. In 2 cases Nd:YAG laser posterior capsulotomy was performed. Conclusion: The asymmetrical diffractive Twin-Set Acrisil®737D / 733D is an effective alternative to provide good simultaneous distance and near vision with good contrast sensitivity and intact binocular vision after bilateral cataract surgery.
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