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https://www.readbyqxmd.com/read/29676324/commentary-presbyopia-correction-with-intraocular-lenses
#1
Kunwar Vikram Singh Dhaliwal
No abstract text is available yet for this article.
May 2018: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29657982/epithelial-ingrowth-following-laser-in-situ-keratomileusis-lasik-prevalence-risk-factors-management-and-visual-outcomes
#2
REVIEW
Darren Shu Jeng Ting, Sathish Srinivasan, Jean-Pierre Danjoux
The number of laser in situ keratomileusis (LASIK) procedures is continuing to rise. Since its first application for correcting simple refractive errors over 25 years ago, the role of LASIK has extended to treat other conditions, including postkeratoplasty astigmatism/ametropia, postcataract surgery refractive error and presbyopia, among others. The long-term effectiveness, predictability and safety have been well established by many large studies. However, due to the creation of a potential interface between the flap and the underlying stroma, interface complications such as infectious keratitis, diffuse lamellar keratitis and epithelial ingrowth may occur...
2018: BMJ open ophthalmology
https://www.readbyqxmd.com/read/29651343/through-focus-vision-performance-and-light-disturbances-of-3-new-intraocular-lenses-for-presbyopia-correction
#3
Santiago Escandón-García, Filomena J Ribeiro, Colm McAlinden, António Queirós, José M González-Méijome
Purpose: To compare the through-focus visual performance in a clinical population of pseudophakic patients implanted with two new trifocal intraocular lenses (IOLs) and one extended depth of focus IOL. Methods: Prospective, nonrandomized, examiner-masked case series. Twenty-three patients received the FineVision® and seven patients received the PanOptix™ trifocal IOLs. Fifteen patients received the Symfony extended depth of focus IOL. Mean age of patients was 63 ± 8 years...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29616886/effect-of-unifocal-versus-multifocal-lenses-on-cervical-spine-posture-in-patients-with-presbyopia
#4
Rami L Abbas, Mohamad T Houri, Mohammad M Rayyan, Hamada Ahmad Hamada, Ibtissam M Saab
SIGNIFICANCE: There are many environmental considerations which may or may not lead to the development of faulty cervical mechanics. The design of near vision lenses could contribute to the development of such cervical dysfunction and consequently neck pain. Decision making regarding proper type of lens prescription seems important for presbyopic individuals. PURPOSE: To investigate the effect of unifocal and multifocal lenses on cervical posture. METHODS: Thirty subjects (18 females and 12 males) participated in the study with an age range from 40 to 64 years...
April 4, 2018: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/29603638/near-visual-acuity-of-dental-hygienists-with-and-without-magnification
#5
M Eichenberger, P Perrin, K R Sieber, A Lussi
OBJECTIVES: The aim of this study was (i) to evaluate the visual performance of dental hygienists in their clinical environment and (ii) to analyse the relationship between self-assessed and objectively measured visual acuity. METHODS: The near visual acuity of 191 dental hygienists and dental hygiene students was self-assessed with a visual analogue scale and objectively measured with miniaturized visual tests in a simulated clinical setting. The visual acuity was also measured with magnification aids if they were part of the individual clinical equipment...
March 30, 2018: International Journal of Dental Hygiene
https://www.readbyqxmd.com/read/29600181/visual-quality-assessment-after-presbyopic-laser-in-situ-keratomileusis
#6
Dong Hui Lim, Eui-Sang Chung, Myoung Joon Kim, Tae-Young Chung
AIM: To assess visual quality after presbyopia correction using an aspheric ablation profile and a micro-monovision protocol. METHODS: This is a retrospective interventional study. Fifty-four eyes of 27 patients (mean age, 50.2±7.5y) who underwent presbyopia correction with an aspheric micro-monovision protocol were enrolled. The values of modulation transfer function (MTF) cutoff frequency, Strehl ratio, objective scattering index (OSI) and accommodation range were quantitatively assessed using the HD analyzer...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29594789/outcomes-of-presbyopia-correcting-intraocular-lenses-after-laser-in-situ-keratomileusis
#7
REVIEW
Sharon S W Chow, Tommy C Y Chan, Alex L K Ng, Alvin K H Kwok
BACKGROUND: Laser in situ keratomileusis (LASIK) is the most common refractive surgery in young patients, which aims at providing a clear distance vision without the use of spectacles. With time, these patients develop symptomatic cataract, which affects activities of daily living, and to improve visual acuity, intraocular lens (IOL) implantation can be considered. In post-myopic LASIK patients, to allow continuation of spectacle independence, the implantation of presbyopia-correcting IOLs is a suitable option...
March 28, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29576438/light-disturbance-with-multifocal-contact-lens-and-monovision-for-presbyopia
#8
Paulo Fernandes, Ana Amorim-de-Sousa, António Queirós, Santiago Escandón-Garcia, Colm McAlinden, José Manuel González-Méijome
Dysphotopsia affects a significant number of patients, particularly after visual correction with multifocal optical designs. PURPOSE: Evaluate light distortion (LD) in two modalities of contact lens (CL) wear: multifocal (MF) and monofocal (MV). METHODS: This was a randomized, double-masked, crossover study involving 20 presbyopic patients. Patients were randomized first into either MF or MV for 15 days of use with a 1 week wash-out period between each lens type...
March 22, 2018: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29545417/prevalence-and-causes-of-vision-loss-in-high-income-countries-and-in-eastern-and-central-europe-in-2015-magnitude-temporal-trends-and-projections
#9
Rupert R A Bourne, Jost B Jonas, Alain M Bron, Maria Vittoria Cicinelli, Aditi Das, Seth R Flaxman, David S Friedman, Jill E Keeffe, John H Kempen, Janet Leasher, Hans Limburg, Kovin Naidoo, Konrad Pesudovs, Tunde Peto, Jinan Saadine, Alexander J Silvester, Nina Tahhan, Hugh R Taylor, Rohit Varma, Tien Y Wong, Serge Resnikoff
BACKGROUND: Within a surveillance of the prevalence and causes of vision impairment in high-income regions and Central/Eastern Europe, we update figures through 2015 and forecast expected values in 2020. METHODS: Based on a systematic review of medical literature, prevalence of blindness, moderate and severe vision impairment (MSVI), mild vision impairment and presbyopia was estimated for 1990, 2010, 2015, and 2020. RESULTS: Age-standardised prevalence of blindness and MSVI for all ages decreased from 1990 to 2015 from 0...
March 15, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29522225/the-sensitivity-of-clinical-outcomes-to-centration-on-the-light-constricted-pupil-for-a-shape-changing-corneal-inlay
#10
Enrique Barragán-Garza, Douglas D Koch, Luis G Vargas, Alan Lang, Adam Roy
PURPOSE: To assess the clinically acceptable range of inlay decentration with respect to the light-constricted pupil center and the coaxially sighted corneal light reflex (CSCLR) for an inlay (Raindrop Near Vision Inlay; ReVision Optics, Inc., Lake Forest, CA) that reshapes the anterior corneal surface. METHODS: In this retrospective, observational cohort study of 115 patients with emmetropic or low hyperopic presbyopia who were implanted with a shape-changing corneal inlay, visual acuity, task performance (in good and dim light), reports of halos and glare, and satisfaction data were collected from the preoperative and 3-month postoperative examinations...
March 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29522030/design-of-a-large-aperture-tunable-refractive-fresnel-liquid-crystal-lens
#11
Afsoon Jamali, Douglas Bryant, Yanli Zhang, Anders Grunnet-Jepsen, Achintya Bhowmik, Philip J Bos
A large aperture tunable lens based on liquid crystals, which is considered for near-to-eye applications, is designed, built, and characterized. Large liquid crystal lenses with high quality are limited by very slow switching speeds due to the large optical path difference (OPD) required. To reduce the switching time of the lens, the thickness is controlled through the application of several phase resets, similar to the design of a Fresnel lens. A main point of the paper is the design of the Fresnel structure to have a minimal effect on the image quality...
March 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29497624/scleral-surgery-for-the-treatment-of-presbyopia-where-are-we-today
#12
REVIEW
AnnMarie Hipsley, Brad Hall, Karolinne M Rocha
Presbyopia corrections traditionally have been approached with attempts to exchange power, either at the cornea or the lens planes, inducing multifocality, or altering asphericity to impact the optical system. Treatments that affect the visual axis, such as spectacle and contact lens correction, refractive surgeries, corneal onlays and inlays, and intraocular lenses are typically unable to restore true accommodation to the presbyopic eye. Their aim is instead to enhance 'pseudoaccommodation' by facilitating an extended depth-of-focus for which vision is sufficient...
2018: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29417087/fundamentals-of-presbyopia-visual-processing-and-binocularity-in-its-transformation
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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