Yazar "Helvacioglu F." seçeneğine göre listele

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    Multifocal progressive refractive diffractive lens: Optic design and clinical results [Multifokal progressif refraktif difraktif lens: Optik tasari{dotless}m ve klinik sonuçlari{dotless}]
    (2012) Tunç Z.; Helvacioglu F.; Şencan S.; Şimşek S.
    Purpose: To evaluate the visual functions of patients who had implantation of new-concept intraocular lens (IOL) OptiVis™, which has aspheric bifocal diffractive and progressive refractive design. Ma te ri al and Met hod: In this prospective study, 52 eyes of 27 patients had a new multifocal IOL OptiVis™ implantation through 2.5 mm incision after cataract surgery with phacoemulsification. 25 of the patients had simultaneous bilateral phacoemulsification with OptiVis™ IOL implantation. Two patients with different multifocal IOL previously implanted underwent monocular OptiVis™ implantation. Monocular distance, near and intermediate visual acuities and contrast sensitivity of the patients were recorded. Presence of glares and halo, frequency of spectacle use and patients' satisfaction were questioned. Re sults: The mean age of the patients was 71.10±10.60 years and the me an follow-up time was 20.35±13.99 months. The mean monocular uncorrected visual acuities of the patients were 0.96±0.11 (Snellen card in decimals) for distance, J1.07±0.26 (Jaeger card) for near (33 cm) and J2.25±0.55 for intermediate (60 cm) at 6 months after the operations. The mean best-corrected monocular visual acuities were 0.97±0.08, J1.05±0.23 and J2.23±0.54, respectively. The mean monocular contrast sensitivity of the patients under photic conditions were 47 in 1.5 cycles per degree (cpd), 73 in 3 cpd, 61 in 6 cpd, 17 in 12 cpd and 2 in 18 cpd. The halo and glare problems which were moderate at the first postoperative month, were mild or none in 20 patients (74.07%) and moderate in 7 patients (25.92%) at 3 months after the surgery. Only one patient (3.70%) sometimes needed glasses for far vision. Posterior capsule opacification was seen in 3 eyes (5.76%). Dis cus si on: OptiVis™, with its diffractive bifocal design, provided very good distance and near vision without any contrast loss. Additionally, this IOL provided considerably good intermediate vision with its progressive refractive design, thus resulted in high patient satisfaction.
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    Supraciliary contraction segments: A new method for the treatment of presbyopia
    (2014) Tunc Z.; Helvacioglu F.; Ercalik Y.; Baikoff G.; Sencan S.
    Background and Objective: To evaluate the safety and effectiveness of supraciliary contraction segment implants (SCSIs) for the treatment of presbyopia. Materials and Methods: This prospective, non-comparative study comprised 10 eyes from five phakic and emmetropic 50-year-old subjects. Preoperative and postoperative near and distance visual acuity, topography, axial length, pachymetry, and intraocular pressure were analyzed. A 5.32-mm long and 0.85-mm thick piece of polymethyl methacrylat (PMMA) and a 5.32-mm long or 0.55-mm thick dried hydrophilic SCSI were placed within the scleral tunnels that were created 2 mm away from the limbus. The 500-550 m deep tunnels were parallel to the limbus and four segments were implanted per eye. The SCSIs were entirely placed at a depth of approximately 85% in the sclera. Results: The uncorrected distance visual acuity was similar before and after the surgery (0.00 logMAR). The monocular mean uncorrected near visual acuity (UNVA) was 0.5 ± 0.0 before surgery, 0.12 ± 0.10 logMAR at 1 month after surgery, 0.16 ± 0.18 logMAR at 3 months after surgery, and 0.29 ± 0.16 logMAR at the 18-month follow-up. Conclusion: Despite obtaining satisfactory results at 6 months after the surgery, a follow-up of the SCSI intervention at 18 months revealed a regression of the early post-op UNVA improvement caused by a progressive outward movement of SCSIs.