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Katherine Lun, Manotosh Ray
PURPOSE: To report a case of keratectasis of a patient underwent INTRACOR presbyopic treatment 5 years ago. METHODS: Case Report. RESULTS: Fifty-eight-year-old gentleman had presented with deteriorating vision in his left eye. He reported undergoing INTRACOR presbyopic treatment in that eye 5 years ago. At presentation, his best-corrected visual acuity was 20/40. Slit-lamp examination of the left eye showed an ectatic cornea with concentric corneal scars...
October 13, 2016: Eye & Contact Lens
Ting Zhang, Yuan Sun, Shengbei Weng, Manli Liu, Yugui Zhou, Xiaonan Yang, Aleksandar Stojanovic, Quan Liu
PURPOSE: To analyze early clinical outcomes of aspheric micro-monovision LASIK for correction of presbyopia and myopia with or without astigmatism. METHODS: Prospective, non-comparative case series of 80 eyes of 40 patients with a mean age of 43.4 ± 4.9 years (range: 38 to 63 years) treated bilaterally using an aspheric micro-monovision protocol. The target refraction was plano for the distance eye and between -0.75 and -2.25 diopters (D) for the near eye. Visual acuity, ocular aberrations, contrast sensitivity, corneal topography, amplitude of accommodation, binocular sensorial function, and satisfaction score questionnaires were evaluated at 3 months after surgery...
October 1, 2016: Journal of Refractive Surgery
Woong-Joo Whang, Young-Sik Yoo, Choun-Ki Joo, Geunyoung Yoon
PURPOSE: To analyze surgically induced refractive change (SIRC) and change in high-order aberration after Raindrop corneal inlay insertion, and assess the extent to which Raindrop corneal inlay insertion could correct presbyopia. DESIGN: Interventional case series. METHODS: 17 patients were included if they had a corneal thickness of 500 μm or greater and a stable manifest spherical equivalent refraction between -0.50 and +1.00 diopters.(D) The Raindrop corneal inlay (ReVision Optics, Lake Forest, CA) was implanted on the stromal bed of a femtosecond laser-assisted generated flap of non-dominant eyes...
September 30, 2016: American Journal of Ophthalmology
P Žiak, K Lucká, P Mojžiš, I Katuščáková, J Halička
: We report the first experience with presbyopia correcting femtosecond laser surgical procedure INTRACOR. This procedure is so far the only one that is made purely intrastromally without generating a wound connected to corneal surface or anterior chamber.Presbyopia - caused by physiological aging and decreasing elasticity of the lens, impairs patients accommodative ability. In the case of the method INTRACOR, presbyopia is corrected by steepening of corneal curvature in the central optical zone...
2016: Ceská a Slovenská Oftalmologie
Paul J Donaldson, Angus C Grey, Bianca Maceo Heilman, Julie C Lim, Ehsan Vaghefi
The optical properties of the ocular lens are important to overall vision quality. As a transparent biological tissue, the lens contributes to the overall and dynamic focussing power of the eye, and corrects for optical errors introduced by the cornea. The optical properties of the lens change throughout life. Alterations to the refractive properties and transparency of the lens result in presbyopia and cataract, respectively. However, it is not well understood how changes to lens cellular structure and function initiate these changes in refraction and transparency...
September 14, 2016: Progress in Retinal and Eye Research
M El-Husseiny, L Daas, A Viestenz, A Langenbucher, B Seitz
BACKGROUND AND PURPOSE: The KAMRA™ inlay (AcuFocus, Irvine, California, USA) is an additional option for correcting presbyopia that has been used for many years in refractive surgery. Our objective is to report our three-month postoperative results of KAMRA™ inlay implantation in terms of near, intermediate and distance vision. PATIENTS AND METHODS: All 24 patients (average age 54.1 ± 6.0 years) were treated with the KAMRA™ inlay in the non-dominant eye (75 % in the left eye) by the same surgeon (MEH)...
September 8, 2016: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
Oluwatobi Olalekan Idowu, Olufisayo T Aribaba, Adeola Olukorede Onakoya, Adekunle Rotimi-Samuel, Kareem Olatunbosun Musa, Folasade Bolanle Akinsola
BACKGROUND: Presbyopia is an age-related loss of lens accommodation resulting in difficulty in performing near task with attendant effect on the quality of life. OBJECTIVE: The objective of the study was to determine the prevalence of presbyopia and presbyopic spectacle correction coverage among public school teachers in Ifo township, with a view to providing a baseline information that could be useful for advocacy and planning appropriate intervention. STUDY DESIGN: The study was a descriptive, cross-sectional study...
July 2016: Nigerian Postgraduate Medical Journal
Negareh Yazdani, Abbas Azimi Khorasani, Hanieh Mirhajian Moghadam, Abbas Ali Yekta, Hadi Ostadimoghaddam, Javad Heravian Shandiz
PURPOSE: To compare three different methods for determining addition in presbyopes. METHODS: The study included 81 subjects with presbyopia who aged 40-70 years. Reading addition values were measured using 3 approaches including the amplitude of accommodation (AA), dynamic retinoscopy (DR), and increasing plus lens (IPL). RESULTS: IPL overestimated reading addition relative to other methods. Mean near addition obtained by AA, DR and IPL were 1...
July 2016: Journal of Ophthalmic & Vision Research
G David, R M Pedrigi, J D Humphrey
Accommodation of the eyes, the mechanism that allows humans to focus their vision on near objects, naturally diminishes with age via presbyopia. People who have undergone cataract surgery, using current surgical methods and artificial lens implants, are also left without the ability to accommodate. The process of accommodation is generally well known; however the specific mechanical details have not been adequately explained due to difficulties and consequences of performing in vivo studies. Most studies have modeled the mechanics of accommodation under assumptions of a linearly elastic, isotropic, homogenous lens and lens capsule...
September 9, 2016: Computer Methods in Biomechanics and Biomedical Engineering
Alexander Leube, Arne Ohlendorf, Siegfried Wahl
PURPOSE: To evaluate whether an induced astigmatism influences the subjective depth of focus. METHODS: Fifty-one participants aged 18 to 35 years and with a mean spherical equivalent refractive error of -0.51 ± 2.35 DS participated in the study. The accommodation was blocked with three drops of 1% cyclopentolate. Refractive errors were corrected after subjective refraction with a 4-mm artificial pupil. To evaluate the depth of focus (DoF), defocus curves with a spherical range of ±1...
October 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Jeffrey Whitman, John Hovanesian, Roger F Steinert, Douglas Koch, Richard Potvin
PURPOSE: To evaluate improvement in the through-focus acuity and visual function provided by a corneal inlay designed to modify the surface shape of the central cornea. SETTING: Two clinical practices, United States. DESIGN: Prospective nonrandomized clinical trial. METHODS: Emmetropic patients with presbyopia who required a reading addition (add) from +1.50 to +2.00 diopters (D) had implantation of the Raindrop Near Vision Inlay in the nondominant eye...
July 2016: Journal of Cataract and Refractive Surgery
Maria Vinas, Carlos Dorronsoro, Veronica Gonzalez, Daniel Cortes, Aiswaryah Radhakrishnan, Susana Marcos
Multifocal vision corrections are increasingly used solutions for presbyopia. In the current study we have evaluated, optically and psychophysically, the quality provided by multizone radial and angular segmented phase designs. Optical and relative visual quality were evaluated using 8 subjects, testing 6 phase designs. Optical quality was evaluated by means of Visual Strehl-based-metrics (VS). The relative visual quality across designs was obtained through a psychophysical paradigm in which images viewed through 210 pairs of phase patterns were perceptually judged...
August 2, 2016: Vision Research
Iraklis Vastardis, Brigitte Pajic-Eggspühler, Jörg Müller, Zeljka Cvejic, Bojan Pajic
PURPOSE: To report the visual outcomes of the femtosecond laser-assisted multifocal aspheric corneal ablation profile using a mini-monovision approach and to evaluate if corneal multifocality was effective, and to report the relative benefits of this approach. PATIENTS AND METHODS: Bilateral femtosecond laser-assisted in situ keratomileusis using a multifocal aspheric corneal ablation profile was performed on 19 hyperopic patients (38 eyes). They were divided into two groups based on eye dominance: dominant eye (DE) group targeting emmetropia and the nondominant eye (NDE) group targeting -0...
2016: Clinical Ophthalmology
Mary Ann Croft, Elke Lütjen-Drecoll, Paul L Kaufman
The ciliary muscle plays a major role in controlling both accommodation and outflow facility in primates. The ciliary muscle and the choroid functionally form an elastic network that extends from the trabecular meshwork all the way to the back of the eye and ultimately attaches to the elastic fiber ring that surrounds the optic nerve and to the lamina cribrosa through which the nerve passes. The ciliary muscle governs the accommodative movement of the elastic network. With age ciliary muscle mobility is restricted by progressively inelastic posterior attachments and the posterior restriction makes the contraction progressively isometric; placing increased tension on the optic nerve region...
July 22, 2016: Experimental Eye Research
Larry A Hookway, Marcela Frazier, Nelson Rivera, Prasidh Ramson, Luis Carballo, Kovin Naidoo
BACKGROUND: Uncorrected presbyopia can greatly impact a person's quality of life and employment prospects. Nicaragua is the poorest country in Latin America and there are no population-based reports of prevalence of presbyopia in Nicaragua. METHODS: A cross-sectional population-based household survey was conducted. The sample was selected through random cluster sampling. Adults 35 years and older were enlisted through a door-to-door method using aged-based sampling...
July 10, 2016: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
Zhiyu Du, Pisong Yan, Qiang Luo, Dan Zhang, Yu Zhang
Purpose. To evaluate high intensity focused ultrasound (HIFU) as an innovation and noninvasive technique to correct presbyopia by altering corneal curvature in the rabbit eye. Methods. Eighteen enucleated rabbit eyes were treated with a prototype HIFU keratoplasty. According to the therapy power, these eyes were divided three groups: group 1 (1 W), group 2 (2 W), and group 3 (3 W). The change in corneal power was quantified by a Sirius Scheimpflug camera. Light microscopy (LM) and transmission electron microscopy (TEM) were performed to determine the effect on the corneal stroma...
2016: Journal of Ophthalmology
Richard S Davidson, Deepinder Dhaliwal, D Rex Hamilton, Mitchell Jackson, Larry Patterson, Karl Stonecipher, Sonia H Yoo, Rosa Braga-Mele, Kendall Donaldson
UNLABELLED: Presbyopia is the most common refractive disorder for people older than 40 years. It is characterized by a gradual and progressive decrease in accommodative amplitude. Many surgical procedures for the correction of presbyopia exist, with additional procedures on the horizon. This review describes the prevalent theories of presbyopia and discusses the available surgical options for correction. FINANCIAL DISCLOSURE: Proprietary or commercial disclosures are listed after the references...
June 2016: Journal of Cataract and Refractive Surgery
Adrijana Dukic, Maja Bohac, Adi Pasalic, Mateja Koncarevic, Marija Anticic, Sudi Patel
PURPOSE: To report a case of apparent corneal ectasia after intrastromal femtosecond laser treatment for presbyopia (INTRACOR). METHODS: A healthy 56-year-old male with low hyperopia underwent an unremarkable bilateral INTRACOR procedure in March/April 2011. The patient was discharged after follow-up and returned 5 years later. RESULTS: Before discharge, the monocular logarithm of the minimal angle of resolution uncorrected distance visual acuity (UDVA) values were R, 0...
June 29, 2016: Cornea
Shinwook Lee, Myoung Choi, Zaiwei Xu, Zeyu Zhao, Elsinore Alexander, Yueai Liu
PURPOSE: The purpose of this study is to compare the optical characteristics of the novel PanOptix presbyopia-correcting trifocal intraocular lens (IOL) and the multifocal ReSTOR +3.0 D IOL, through in vitro bench investigations. METHODS: The optical characteristics of AcrySof(®) IQ PanOptix™ (PanOptix) and AcrySof(®) IQ ReSTOR +3.0 D (ReSTOR +3.0 D) IOLs were evaluated by through-focus Badal images, simulated headlight images, and modulation transfer function (MTF) measurements which determine resolution, photic phenomena, and image quality...
2016: Clinical Ophthalmology
Ling Lin, Corina van de Pol, Srividhya Vilupuru, Jay S Pepose
PURPOSE: To develop a normative contrast sensitivity function and examine the postoperative contrast sensitivity outcomes for emmetropic patients with presbyopia implanted with a KAMRA intracorneal inlay (AcuFocus Inc., Irvine, CA) in their non-dominant eyes. METHODS: A prospective, non-randomized, multicenter clinical trial was conducted on 507 patients between 45 and 60 years of age who were monocularly implanted with the KAMRA inlay. A predetermined subgroup of 335 patients in the contrast sensitivity substudy were measured preoperatively and postoperatively with the Functional Acuity Contrast Test (FACT) chart in the Optec 6500 Vision Tester (Stereo Optical Co...
June 1, 2016: Journal of Refractive Surgery
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