Terms Of Optical Quality Research Articles

Comparison of visual results and optical quality of two presbyopia-correcting intraocular lenses: TECNIS symfony versus TECNIS synergy.

This study compared the extended depth of focus (EDOF) intraocular lens (IOL) (ZXR00; Tecnis® Symfony®, Johnson & Johnson Vision, Santa Ana, CA, USA) and a new presbyopia-correcting IOL that combines EDOF and multifocal profiles (ZFR00; Tecnis® Synergy®, Johnson & Johnson Vision, Santa Ana, CA, USA) with the same material. The medical records of patients undergoing cataract surgery with ZXR00 or ZFR00 implantation between March 2021 and July 2021 and with the data available for the 3-month visit were reviewed. The uncorrected near, intermediate, and distance visual acuity (VA), corrected distance VA, defocus curves, refractive errors (RE), optical quality parameters, and patient-reported visual performance parameters were the main outcome measures. Among the twenty-three enrolled patients, twelve patients (21 eyes) received ZXR00 and nine patients (17 eyes) received ZFR00. The mean age of the patients was 59.6 ± 10.6 (range: 49 to 70) and 65.2 ± 8.2 (range: 45 to 82) years in ZXR00 and ZFR00 groups, respectively, without significant difference. There was not a significant difference between the two groups in terms of baseline parameters and postoperative RE. The ZFR00 group showed markedly superior intermediate and near VA (p < 0.001 for all) at 3 months postoperatively. In terms of optical quality, ZXR00 was significantly better than ZFR00 (p < 0.001). Both IOLs had comparable distance VA. ZFR00 IOL was superior for intermediate and near visual acuity, but ZXR00 IOL was better for optical quality. Research with more participants is needed to support this finding.

Comparison Between an Intraocular Lens With Extended Depth of Focus (Tecnis Symfony ZXR00) and a New Monofocal Intraocular Lens With Enhanced Intermediate Vision (Tecnis Eyhance ICB00).

Purpose:This study compared the extended depth of focus (EDOF) intraocular lens (IOL) (ZXR00; Tecnis Symfony, Johnson & Johnson Vision, Santa Ana, CA, US) to a novel, higher-order aspheric monofocal IOL (ICB00; Tecnis Eyhance, Johnson & Johnson Vision, Santa Ana, CA, US) which uses the same platform and material.Methods:Medical records of patients undergoing cataract surgery with ZXR00 or ICB00 implantation between March 2020 and January 2021 and with the data available for the 3-month visit were reviewed. The uncorrected near, intermediate, and distance visual acuity (VA); corrected distance VA; and optical quality parameters were the main outcome measures.Results:Among the 174 enrolled patients, 72 and 102 received the ZXR00 and ICB00, respectively. The average patient ages were 59.6 ± 10.6 (range: 49 to 70) and 65.2 ± 8.2 (range: 45 to 82) years in the ZXR00 and ICB00 groups, respectively, with significantly older patients in the ICB00 group. The other baseline parameters were not different for the 2 groups. Compared to the ICB00 group, the ZXR00 group showed markedly superior near VA (P < 0.05) at 3 months postoperatively. In terms of optical quality, ICB00 was, statistically, significantly superior to ZXR00.Conclusions:The ZXR00 showed remarkable near vision and defocus curve smoothness, while the ICB00 achieved better optical quality. The 2 IOLs had comparable distance and intermediate vision.

Quality control of tempered glass panels with photoelasticity

The quality of prestressed glass components can be evaluated in terms of technical quality – which means sufficient compliance with the product standards – as well as in terms of optical quality – which means a minimum of optical distortions or thermal anisotropies. Both requirements – technical quality and optical quality – become more and more important for both current and future glass applications. Structural applications, such as glass beams or columns, can only be realised with high-quality glass that completely fulfils the product standards. Challenging architectural solutions demand a minimum of anisotropic effects. Until now the prestressing has been evaluated by destructive breakage tests, which give only random information about the glass quality. In recent years, however, a very simple non-destructive method has been developed using polarising filters. Appropriate evaluation criteria have been defined so that a screening almost over the entire surface (related to the area of a glass panel and the number of glass panels produced) gives full information about the homogeneity of the prestressing. This method has the further advantage that all possible glass geometries (for instance glass products such as curved glass panels) can easily be checked in a non-destructive way.

Tellurium‐Based Far‐Infrared Transmitting Glasses

Spectroscopic investigations of molecules having their main infrared (IR) signatures at longer wavelengths require optical elements transmitting lights as far as possible in the IR region toward 20 μm and beyond. In this paper, several far‐IR transmitting glass systems including Ge–In–Te, Ge–As–Te, as well as some compositions containing gallium, CsI, KI, or iodine are reported. Their glass‐forming ability, thermal stability, and IR transmitting property are investigated. The gallium‐containing glasses show intrinsic absorptions in the 15–20 μm region. These absorptions disappear if gallium is replaced by indium, a heavier element, but these glasses display mediocre glass forming ability. Among the systems, Ge–As–Te glasses show superior glass‐forming ability and wide IR transparency. The ΔT of glasses in this system can be as great as 145°C and most of the studied glasses exhibit excellent transparency in the 3–20 μm spectral window. These glass properties compares favorably to the state‐of‐the‐art Ge–Te–I glasses both in terms of optical quality and thermodynamic stability.

Advances in microincision cataract surgery intraocular lenses

This paper reviews the recent developments in microincision cataract surgery intraocular lenses. Seven intraocular lenses are currently available for implantation through sub-2.0-mm incision. From the intraocular lenses available, two microincision cataract surgery intraocular lenses were included in clinical studies and their results were reviewed. The available lenses were implanted through a clear corneal incision of 1.5-1.9 mm and showed excellent biocompatibility. The behavior of the microincision cataract surgery in vivo is similar to the conventional lenses in terms of optical quality and retinal image quality. The clinical results of microincision cataract surgery intraocular lenses such as Acri. Smart 48S showed that a certain degree of pseudoaccommodation could be achieved with this lens. Cataract removal through sub-2.0 mm incision is possible with implantation of microincision cataract surgery intraocular lenses through the same undilated incision. The current technique allows cataract removal through 1.7 mm and the available microincision cataract surgery intraocular lenses showed optical quality and biocompatibility similar to conventional intraocular lenses.

Light composite mirrors for RICH detectors: production, characterisation and stability tests

The production of lightweight composite mirror prototypes suitable for application in Ring Imaging Cherenkov (RICH) detectors is described. The goal is the use of such mirrors whenever material budget is a concern. The manufacturing technique is described in detail, together with the achieved results in terms of optical quality. Several ageing tests have been performed on some of the prototypes. The results of these tests are reported.

650-nm AlGaInP multiple-quantum-well lasers grown by metalorganic chemical vapor deposition using tertiarybutylphosphine

Using tertiarybutylphosphine (TBP) as phosphorus precursor, high-quality AlGaInP epilayers and AlGaInP/GaInP multiple-quantum-well (MQW) structures have been grown by metalorganic chemical vapor deposition. The photoluminescence results indicate that the AlGaInP materials are as good as those grown using PH3 in terms of optical quality. Finally, AlGaInP MQW red laser structures have been grown, and the electrically pumped AlGaInP red lasers grown by TBP have been demonstrated with the emission wavelength of 647 nm, indicating that TBP can be used to grow high-quality AlGaInP epilayers and AlGaInP-based red lasers, which presently is dominated by the highly toxic gas source PH3.

A novel crosslinker for UV copolymerization of N ‐vinyl pyrrolidone and methacrylates to give hydrogels

Methacryloxyethyl vinyl carbonate, a novel crosslinker containing a vinyl carbonate and a methacrylate group which is capable of copolymerizing N-vinyl pyrrolidone and methacrylates, was prepared. With this crosslinker, N-vinyl pyrrolidone (NVP) and methacrylates can copolymerize efficiently under strictly UV conditions. It was found that this crosslinker was able to give hydrogels with higher water content, higher tear strength, and lower modulus, compared to a traditional dimethacrylate crosslinker. In addition, hydrogel lenses fabricated by UV curing of formulations using this crosslinker were found to be superior to those fabricated with established process in terms of optical quality. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 1039–1046, 1997

A study of neodymium-chelate-doped optical polymer waveguides

The problem of doping optical quality polymers with chelated Nd3+ has been studied. A number of material systems were evaluated. The best results in terms of optical quality at a high Nd3+ concentration were achieved by doping a fluorinated polyimide with fluorinated neodymium chelate. Slab and channel waveguides were fabricated in this material system. Optical absorption and luminescence studies were carried out.