scholarly journals A new trifocal corneal inlay for presbyopia

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Walter D. Furlan ◽  
Diego Montagud-Martínez ◽  
Vicente Ferrando ◽  
Salvador García-Delpech ◽  
Juan A. Monsoriu
Keyword(s):  
Adaptive Optics ◽  
Refractive Surgery ◽  
Contact Lenses ◽  
Optical Design ◽  
Small Aperture ◽  
Complete Independence ◽  
Corneal Inlay ◽  
Design Software ◽  
Opening Up ◽  
Good Vision

AbstractCorneal inlays (CIs) are the most recent surgical procedure for the treatment of presbyopia in patients who want complete independence from the use of glasses or contact lenses. Although refractive surgery in presbyopic patients is mostly performed in combination with cataract surgery, when the implantation of an intraocular lens is not necessary, the option of CIs has the advantage of being minimally invasive. Current designs of CIs are, either: small aperture devices, or refractive devices, however, both methods do not have good performance simultaneously at intermediate and near distances in eyes that are unable to accommodate. In the present study, we propose the first design of a trifocal CI, allowing good vision, at the same time, at far, intermediate and near vision in presbyopic eyes. We first demonstrate the good performance of the new inlay in comparison with a commercially available CI by using optical design software. We next confirm experimentally the image forming capabilities of our proposal employing an adaptive optics based optical simulator. This new design also has a number of parameters that can be varied to make personalized trifocal CI, opening up a new avenue for the treatment of presbyopia.

Experiment Layout of Space Laser Communication System Based on Adaptive Optical System

2011 ◽  
Vol 287-290 ◽  
pp. 3020-3023
Author(s):  
Shu Fan Wang ◽  
Xiao Tian Wang ◽  
Xiang Yang Zou ◽  
Yong Wen
Keyword(s):  
Adaptive Optics ◽  
Optical System ◽  
Communication System ◽  
Optical Design ◽  
Low Earth Orbit ◽  
Laser Communication ◽  
Adaptive Optical System ◽  
Ground Station ◽  
Design Software ◽  
Beam Transmission

Sixty-one unit adaptive optical system was used to analyze the influence of atmospheric turbulence on laser beam transmission in space laser communication system. From low earth orbit planet to ground station Laser communication system was estimated by means of optical design software. In addition, the compensation results, experimental phenomena and data based on adaptive optics were also analyzed in the paper.

scholarly journals Manufacture of Contact Lens of Nanoparticle-Doped Polymer Complemented with ZEMAX

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2028
Author(s):  
Lina M. Shaker ◽  
Ahmed A. Al-Amiery ◽  
Abdul Amir H. Kadhum ◽  
Mohd S. Takriff
Keyword(s):  
Contact Lenses ◽  
Titanium Dioxide Nanoparticles ◽  
Optical Design ◽  
Sol Gel ◽  
High Refractive Index ◽  
Light Transmittance ◽  
Great Promise ◽  
Modulation Transfer ◽  
Tio2 Nps ◽  
Molding Method

Many people suffer from myopia or hyperopia due to the refractive errors of the cornea all over the world. The use of high refractive index (RI), Abbe number (νd), and visible light transmittance (T%) polymeric contact lenses (CLs) holds great promise in vision error treatment as an alternative solution to the irreversible laser-assisted in situ keratomileusis (LASIK) surgery. Titanium dioxide nanoparticles (TiO2 NPs) have been suggested as a good candidate to rise the RI and maintain high transparency of a poly(methyl methacrylate) (PMMA)-TiO2 nanocomposite. This work includes a preparation of TiO2 NPs using the sol gel method as well as a synthesis of pure PMMA by free radical polarization and PMMA-TiO2 CLs using a cast molding method of 0.005 and 0.01 w/v concentrations and a study of their effect on the aberrated human eye. ZEMAX optical design software was used for eye modeling based on the Liou and Brennan eye model and then the pure and doped CLs were applied. Ocular performance was evaluated by modulation transfer function (MTF), spot diagram, and image simulation. The used criteria show that the best vision correction was obtained by the CL of higher doping content (p < 0.0001) and that the generated spherical and chromatic aberrations in the eye had been reduced.

Microbiological Examination of Bandage Soft Contact Lenses Used in Laser Refractive Surgery

1998 ◽  
Vol 14 (6) ◽  
pp. 631-635
Author(s):  
Efstathios T Detorakis ◽  
Dimitrios S Siganos ◽  
Vasilios M Houlakis ◽  
Vasilios P Kozobolis ◽  
Ioannis G Pallikaris
Keyword(s):  
Refractive Surgery ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Microbiological Examination ◽  
Laser Refractive Surgery

Persistent corneal fibrosis after explantation of a small-aperture corneal inlay

2019 ◽  
Vol 45 (3) ◽  
pp. 367-371 ◽  
Author(s):  
Norman Romito ◽  
Elena Basli ◽  
Isabelle Goemaere ◽  
Vincent Borderie ◽  
Laurent Laroche ◽  
...  
Keyword(s):  
Small Aperture ◽  
Corneal Inlay

scholarly journals Research on Laser Dazzle Simulation Using ZEMAX Software and MATLAB

2020 ◽  
Vol 327 ◽  
pp. 02001
Author(s):  
Niu jin ◽  
Xu xiping ◽  
An zhiyong
Keyword(s):  
Ray Tracing ◽  
Programming Language ◽  
Optical Design ◽  
Optical Element ◽  
Analysis Model ◽  
Software Simulation ◽  
Scope Of Application ◽  
Disability Glare ◽  
Design Software ◽  
Calibration And Verification

The dazzling process of the laser has been digitally simulated. First, the optical design software (ZEMAX) is combined with the scientific programming language (MATLAB), then the ray tracing is used to build the scattering model of each optical element, and finally compared with a simpler model based on CIE disability glare data to achieve the calibration and verification of the software simulation effect. The results show that this advanced optical eye simulation technology can be used to study the laser glare efficiency, and it is possible to expand the scope of application of the analysis model.

Overview of pharmacological treatments for presbyopia

2021 ◽  
Vol 1 (2) ◽  
pp. 67-77
Author(s):  
Betina Orman ◽  
Giovanna Benozzi
Keyword(s):  
Pharmacological Treatment ◽  
Contact Lenses ◽  
English Literature ◽  
Crystalline Lens ◽  
Surgical Strategies ◽  
Non Invasive ◽  
Near Visual Acuity ◽  
Over 40 Years ◽  
Good Vision

Background: Presbyopia is the normal progressive waning of accommodation with loss of the visual ability to focus on objects residing at different distances. Presbyopia exacts a cost in quality of life and professional efficiency of many people over 40 years of age. Presbyopia is likely to be 1 of the main pressing visual concerns of the 21st century, given that life expectancy is increasing, resulting in an aging population. This review aimed to address the 3 strategies of the pharmacological treatment for presbyopia. Methods: A review on PubMed/MEDLINE, Google Scholar, and Clinicaltrials.gov was performed to investigate the English literature on pharmacological treatment for presbyopia from beginning-of-year 2012 to September 30, 2020. Results: In addition to the treatment of presbyopia with glasses or contact lenses, new surgical strategies have been developed, some of which have been successful. However, during the last decade, a new, promising, non-invasive option for treating presbyopia has emerged: the pharmacological approach. Many researchers have developed 3 different lines of investigation from different assumptions, on a pharmacological basis. The first consisted of producing miosis, to take advantage of a pharmacologically induced pinhole effect, increasing depth-of-focus, and thus improving uncorrected near visual acuity. The second aimed to rehabilitate accommodation binocularly to enable good vision at all distances. Finally, the third approach attempted to rehabilitate lost elasticity in the human crystalline lens. Conclusions: None of the 3 discussed pharmacological strategies for treating presbyopia, prescribed globally, but patients of restoring accommodation strategy can adhere locally, where they are sold so far as master prescriptions.

Central and Peripheral Corneal Iron Deposits After Implantation of a Small-aperture Corneal Inlay for Correction of Presbyopia

2011 ◽  
Vol 27 (12) ◽  
pp. 876-880 ◽  
Author(s):  
Alois K. Dexl ◽  
Josef Ruckhofer ◽  
Wolfgang Riha ◽  
Melchior Hohensinn ◽  
Theresa Rueckl ◽  
...  
Keyword(s):  
Small Aperture ◽  
Corneal Inlay ◽  
Iron Deposits
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