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Presbyopia

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https://www.readbyqxmd.com/read/29417087/fundamentals-of-presbyopia-visual-processing-and-binocularity-in-its-transformation
#1
Olga I Rozanova, Andrey G Shchuko, Tatyana S Mischenko
Background: The accommodation has considerable interactions with the pupil response, vergence response and binocularity. The transformation of visual reception processing and the changes of the binocular cooperation during the presbyopia development are still poorly studied. So, the regularities of visual system violation in the presbyopia formation need to be characterized. This study aims to reveal the transformation of visual reception processing and to determine the role of disturbances in binocular interactions in presbyopia formation...
2018: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29404678/-biomechanical-investigations-on-accommodation-of-the-eye
#2
REVIEW
H Martin, O Stachs, R Guthoff, N Grabow, A Jünemann
BACKGROUND: The biomechanics of accommodation are of particular interest in terms of the causes of presbyopia and the function of intraocular lenses. OBJECTIVE: The aim of the present article is to model the mechanism of accommodation in detail. MATERIALS AND METHODS: The state of the art of applying biomechanical models to accommodation is presented, which enables the accommodation process to be understood. RESULTS AND CONCLUSION: The established models, which are based on the Helmholtz theory, can explain the accommodation process in a plausible manner...
February 5, 2018: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/29382918/individual-neural-transfer-function-affects-the-prediction-of-subjective-depth-of-focus
#3
Alexander Leube, Tim Schilling, Arne Ohlendorf, David Kern, Alex G Ochakovski, M Dominik Fischer, Siegfried Wahl
Attempts to accurately predict the depth of focus (DoF) based on objective metrics have failed so far. We investigated the effect of the individual neural transfer function (iNTF) on the quality of the prediction of the subjective DoF from objective wavefront measures. Subjective DoF was assessed in 22 participants using subjective through focus curves of visual acuity (VA). Objective defocus curves were calculated for visual Strehl metrics of the optical (VSOTFa) and the modulation transfer function as well as the point spread function...
January 30, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29382905/biological-corneal-inlay-for-presbyopia-derived-from-small-incision-lenticule-extraction-smile
#4
Yu-Chi Liu, Ericia Pei Wen Teo, Heng Pei Ang, Xin Yi Seah, Nyein Chan Lwin, Gary Hin Fai Yam, Jodhbir S Mehta
Corneal inlays are a relatively new treatment option for presbyopia. Using biological inlays, derived from lenticules extracted from small incision lenticule extraction, may offer advantages over commercialized synthetic inlays in the aspect of biocompatibility. We conducted a non-human primate study to evaluate the safety, predictability, efficacy and tissue response after autogeneic, decellularized xenogeneic and xenogeneic lenticule implantation. The lenticule implantation effectively resulted in central corneal steepening (simulated keratometric values increased by 1...
January 30, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29376229/investigation-of-the-changes-in-refractive-surgery-trends-in-korea
#5
Jong Ho Ahn, Dong Hyun Kim, Kyung Hwan Shyn
PURPOSE: To evaluate changes in clinical practice in the field of refractive surgery in Korea over the past 10 years. METHODS: A survey consisting of 59 multiple-choice questions regarding the preferred types of refractive surgery, excimer laser machine, and presbyopia surgery was mailed to 742 members of the Korean Society of Cataract and Refractive Surgery in January 2016, and 50 members responded to the survey. These data were compared with the 2005 or 2007 survey results...
January 25, 2018: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/29367202/prevalence-and-incidence-of-presbyopia-in-urban-southern-china
#6
Xiaotong Han, Pei Ying Lee, Stuart Keel, Mingguang He
AIMS: To investigate the prevalence and incidence of presbyopia in an urban Chinese population. METHODS: 1817 subjects aged ≥35 years were identified by random cluster sampling in Yuexiu District, Guangzhou, China, at baseline in 2008, and all were invited for the follow-up examination in 2014. Distance and near visual acuity (VA) tests, as well as non-cycloplegic automated refraction were performed at each examination as per standardised protocol. Participants with presenting near VA ≤20/40 were further tested with add power at a standard distance of 40 cm to obtain their best-corrected near VA...
January 24, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29297211/pupil-size-stability-of-the-cubic-phase-mask-solution-for-presbyopia
#7
Citlalli Almaguer, Eva Acosta, Justo Arines
Presbyopia correction involves different types of studies such as lens design, clinical study, and the development of objective metrics, such as the visual Strehl ratio. Different contact lens designs have been proposed for presbyopia correction, but performance depends on pupil diameter. We will analyze the potential use of a nonsymmetrical element, a cubic phase mask (CPM) solution, to develop a contact or intraocular lens whose performance is nearly insensitive to changes in pupil diameter. We will show the through focus optical transfer function of the proposed element for different pupil diameters ranging from 3 to 7 mm...
January 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29217455/a-new-method-to-analyse-the-effect-of-multifocal-contact-lenses-on-visual-function
#8
I Sanchez, S Ortiz-Toquero, M Blanco, R Martin
PURPOSE: Presbyopic contact lens (CL) fittings produce simultaneous vision, providing different retinal images that reduce visual quality and wearers' satisfaction. The purpose of this study was to develop a new method to isolate the multifocality effect of different CL options to manage presbyopia, analysing the impact on binocular visual acuity (VA), stereopsis and contrast sensitivity (CS) and determining the effect of the use of a yellow filter (YF) on visual function. METHODS: A prospective and double-masked randomized pilot study involving 20 healthy volunteers was conducted...
December 4, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29207744/awareness-of-presbyopia-among-rural-female-population-in-north-karnataka
#9
Charushila V Gajapati, A V Pradeep, Anupama Kakhandaki, R K Praveenchandra, Sanjana Rao
Introduction: Presbyopia is an age related loss of lens accommodation resulting in inability to read and/write or to do near work. Though literacy level may be low in rural female population of South India, but household works like sewing, sorting grains and operating mobile phones must be difficult due to presbyopia. Aim: To determine the awareness of presbyopia in rural females; also, to determine the knowledge levels regarding presbyopia, spectacle coverage and reasons for not wearing spectacles...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29154795/vision-improvement-in-pilots-with-presbyopia-following-perceptual-learning
#10
Anna Sterkin, Yuval Levy, Russell Pokroy, Maria Lev, Liora Levian, Ravid Doron, Oren Yehezkel, Moshe Fried, Yael Frenkel-Nir, Barak Gordon, Uri Polat
Israeli Air Force (IAF) pilots continue flying combat missions after the symptoms of natural near-vision deterioration, termed presbyopia, begin to be noticeable. Because modern pilots rely on the displays of the aircraft control and performance instruments, near visual acuity (VA) is essential in the cockpit. We aimed to apply a method previously shown to improve visual performance of presbyopes, and test whether presbyopic IAF pilots can overcome the limitation imposed by presbyopia. Participants were selected by the IAF aeromedical unit as having at least initial presbyopia and trained using a structured personalized perceptual learning method (GlassesOff application), based on detecting briefly presented low-contrast Gabor stimuli, under the conditions of spatial and temporal constraints, from a distance of 40 cm...
November 14, 2017: Vision Research
https://www.readbyqxmd.com/read/29152742/presbyopia-monovision-correction-and-cortical-adaptation
#11
Andreia Martins Rosa
No abstract text is available yet for this article.
November 19, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29148031/small-incision-lenticule-extraction-smile-monovision-for-presbyopia-correction
#12
Nikolaus Luft, Jakob Siedlecki, Walter Sekundo, Christian Wertheimer, Thomas C Kreutzer, Wolfgang J Mayer, Siegfried G Priglinger, Martin Dirisamer
PURPOSE: To evaluate the outcomes of myopic small incision lenticule extraction (SMILE) monovision in presbyopic patients. METHODS: This study included 49 presbyopic patients older than 45 years seeking surgical correction of myopia or myopic astigmatism who underwent bilateral SMILE with planned monovision in the SMILE Eyes Clinic Linz, Austria. Target refraction was plano for dominant (distance) eyes and ranged between -1.25 and -0.50 D for nondominant (near) eyes...
November 4, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/29121878/comparison-of-femtosecond-laser-assisted-corneal-intrastromal-xenotransplantation-and-the-allotransplantation-in-rhesus-monkeys
#13
He Jin, Liangping Liu, Hui Ding, Miao He, Chi Zhang, Xingwu Zhong
BACKGROUND: In our previous study, we showed that both allogeneic and autogeneic small-incision femtosecond laser-assisted corneal intrastromal transplantation are safe and effective surgeries. However, the results of small-incision femtosecond laser-assisted intrastromal xenotransplantation have not yet been explored. Additionally, we suggest that glycerol-dehydrated corneal lamellae might provide a possible alternative for this xenogenic implantation approach. METHODS: Corneal inlay lamellae were produced from rabbits and humans using femtosecond laser-assisted surgeries and were dehydrated in glycerol for 1 week at 4 °C...
November 9, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/29117414/monovision-lasik-versus-presbyopia-correcting-iols-comparison-of-clinical-and-patient-reported-outcomes
#14
Steven C Schallhorn, David Teenan, Jan A Venter, Julie M Schallhorn, Keith A Hettinger, Stephen J Hannan, Martina Pelouskova
PURPOSE: To compare clinical and quality of life outcomes between patients who underwent monovision LASIK and refractive lens exchange. METHODS: The study comprised 590 patients with refractive lens exchange and 608 patients with monovision LASIK available for 3-month postoperative clinical visits. All patients with refractive lens exchange had a Tecnis Symfony lens (Johnson & Johnson Vision Care, Inc., Santa Ana, CA) in at least one eye. Patients were divided into four refractive categories: moderate to high myopia, low myopia, plano presbyopia, and hyperopia...
November 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29090052/review-of-static-approaches-to-surgical-correction-of-presbyopia
#15
REVIEW
Mohammad Ali Zare Mehrjerdi, Masomeh Mohebbi, Mehdi Zandian
Presbyopia is the primary cause of reduction in the quality of life of people in their 40s, due to dependence on spectacles. Therefore, presbyopia correction has become an evolving and rapidly progressive field in refractive surgery. There are two primary options for presbyopia correction: the dynamic approach uses the residual accommodative capacity of the eye, and the static approach attempts to enhance the depth of focus of the optical system. The dynamic approach attempts to reverse suspected pathophysiologic changes...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29071723/immediate-cortical-adaptation-in-visual-and-non-visual-areas-functions-induced-by-monovision
#16
Fabrizio Zeri, Marika Berchicci, Shehzad A Naroo, Sabrina Pitzalis, Francesco Di Russo
KEY POINTS: Monovision is an optical correction for presbyopes that consists of correcting one eye for far distance and the other for near distance, creating a superimposition of an in-focus with a blurred image. Brain adaptation to monovision was studied in unexperienced observers by measuring visual evoked potentials from 64-channels. The first clear effect of monovision on visual evoked potentials was the C1 amplitude reduction, indicating that the unilateral blurring induced by monovision reduces feed-forward activity in primary visual area...
October 25, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29044672/virtual-issue-editorial-presbyopia-grappling-with-an-age-old-problem
#17
EDITORIAL
W Neil Charman
No abstract text is available yet for this article.
November 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29033538/comparison-of-a-hydrogel-corneal-inlay-and-monovision-laser-in-situ-keratomileusis-in-presbyopic-patients-focus-on-visual-performance-and-optical-quality
#18
Cornelis Verdoorn
PURPOSE: To compare the visual performance and optical quality after Raindrop Near Vision Inlay implantation or monovision LASIK for the correction of presbyopia. MATERIALS AND METHODS: In this retrospective case-series study, patients previously treated in the nondominant eye with monovision LASIK were compared with patients previously implanted with Raindrop Near Vision Inlay. The study enrolled 16 inlay and 15 monovision LASIK patients. Uncorrected near visual acuity, uncorrected distance visual acuity, binocular stereopsis, patient satisfaction, and patient task performance were assessed...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28991622/presbyopia-correction-after-previous-refractive-laser-and-cataract-surgery-september-consultation-1
#19
Rudy M M A Nuijts, An-Katrien de Brauwer
No abstract text is available yet for this article.
September 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28976783/prevalence-of-refractive-error-presbyopia-and-unmet-need-of-spectacle-coverage-in-a-northern-district-of-bangladesh-rapid-assessment-of-refractive-error-study
#20
Mohammad Muhit, Hasan Minto, Afroza Parvin, Mohammad Z Jadoon, Johurul Islam, Sumrana Yasmin, Gulam Khandaker
PURPOSE: To determine the prevalence of refractive error (RE), presbyopia, spectacle coverage, and barriers to uptake optical services in Bangladesh. METHOD: Rapid assessment of refractive error (RARE) study following the RARE protocol was conducted in a northern district (i.e., Sirajganj) of Bangladesh (January 2010-December 2012). People aged 15-49 years were selected, and eligible participants had habitual distance and near visual acuity (VA) measured and ocular examinations were performed in those with VA<6/18...
October 4, 2017: Ophthalmic Epidemiology
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