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Uncorrected refractive error

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https://www.readbyqxmd.com/read/28068441/changes-in-astigmatism-densitometry-and-aberrations-after-smile-for-low-to-high-myopic-astigmatism-a-12-month-prospective-study
#1
Iben Bach Pedersen, Anders Ivarsen, Jesper Hjortdal
PURPOSE: To evaluate 12-month changes in refraction, visual outcome, corneal densitometry, and postoperative aberrations after small incision lenticule extraction (SMILE) for myopic astigmatism. METHODS: This 12-month prospective clinical trial comprised 101 eyes (101 patients) treated with SMILE for myopic astigmatism with cylinder of 0.75 to 4.00 diopters (D). The preoperative, 1-week, and 1-, 3-, 6-, 9-, and 12-month examinations included measurement of manifest refraction, uncorrected distance visual acuity (UDVA), and corrected (CDVA) distance visual acuity...
January 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28060059/efficacy-of-intrastromal-corneal-ring-segments-combined-with-flash-collagen-cross-linking-in-keratoconus
#2
Carlos H Gordillo, Juan C Grandin, Roger Zaldivar, Roberto Zaldivar, Adriana C Lotfi
PURPOSE: To evaluate outcomes, efficacy, and safety of intrastromal corneal ring segment implantation for treatment of keratoconus combined with collagen cross-linking (CXL) with 1-year follow-up. METHODS: One hundred nineteen eyes of 82 patients with keratoconus (37 females) underwent femtosecond (Intralase FS; Abbott Medical Optics, Inc) laser-assisted intrastromal corneal ring segment implantation (INTRASEG; Gamma Vision) with flash CXL (18 mW/cm for 5 minutes)...
February 2017: Cornea
https://www.readbyqxmd.com/read/28039346/piggy-back-intraocular-lens-for-the-correction-of-buckling-surgery-induced-refractive-error-in-pseudophakia
#3
Rajesh Sinha, Reena Singh, Vijay K Sharma, Jeewan S Titiyal
A 29-year-old man presented to us with bilateral pseudophakia with suboptimal vision in right eye. His uncorrected distance visual acuity (UDVA) on Snellen's chart was 6/36 and 6/9 in right eye (OD) and left eye (OS), respectively. It improved to 6/9 OD with -5.00DS/-0.50DC at 90° and 6/6 OS with -0.5DC at 100°. He had undergone buckling surgery 1 year back for rhegmatogenous retinal detachment in right eye and subsequently developed a myopic refractive error. A spherical piggyback intraocular lens (IOL; Rayner Sulcoflex, East Sussex) was implanted in the sulcus for refractive correction...
December 30, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/28034710/a-multicenter-prospective-cohort-study-on-refractive-surgery-in-15011-eyes
#4
Kazutaka Kamiya, Akihito Igarashi, Ken Hayashi, Kazuno Negishi, Masaki Sato, Hiroko Bissen-Miyajima
PURPOSE: To assess the clinical outcomes of currently used refractive surgery procedures performed in 2015. DESIGN: Prospective, multicenter cohort study. METHODS: This prospective study included 15,011 eyes of 7622 consecutive patients who underwent laser in situ keratomileusis (LASIK), surface ablation, refractive lenticule extraction (ReLEx), or phakic intraocular lens (IOL) implantation at 42 major institutions. We determined the safety, efficacy, predictability, stability, and adverse events of these surgeries preoperatively and at 1 week and 1 and 3 months postoperatively...
December 26, 2016: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28009348/the-state-of-ocular-health-among-london-s-homeless-population
#5
N Sawers
PurposeTo investigate the demographics, visual impairment, and diagnoses of patients presenting to Vision Care for Homeless People (VCHP), Crisis clinics for London's under-researched homeless population.Patients and methodsTwo hundred eighty-three patients records, including data on sociodemographic, diabetic status, visual acuity, and ocular examination, via a comprehensive eye test were reviewed from the VCHP clinics held at 10 London 'Crisis at Christmas' centres in 2014.ResultsTwo hundred eighty-three individual patients were seen at the VCHP clinics...
December 23, 2016: Eye
https://www.readbyqxmd.com/read/28002107/astigmatism-correction-with-toric-intraocular-lenses-in-descemet-membrane-endothelial-keratoplasty-triple-procedures
#6
Hideaki Yokogawa, P James Sanchez, Zachary M Mayko, Michael D Straiko, Mark A Terry
PURPOSE: To report the clinical efficacy of astigmatism correction with toric intraocular lenses (IOLs) in patients undergoing the Descemet membrane endothelial keratoplasty (DMEK) triple procedure and to evaluate the accuracy of the correction. METHODS: Fifteen eyes of 10 patients who received cataract extraction, toric IOL placement, and DMEK surgery for Fuchs corneal dystrophy and cataracts were evaluated. The cylinder power of toric IOLs was determined by an online toric calculator with keratoscopy measurements obtained using Scheimpflug corneal imaging...
December 20, 2016: Cornea
https://www.readbyqxmd.com/read/27990372/main-visual-symptoms-associated-to-refractive-errors-and-spectacle-need-in-a-brazilian-population
#7
Silvana Schellini, Fabio Ferraz, Paula Opromolla, Laryssa Oliveira, Carlos Padovani
AIM: To determine the main visual symptoms in a Brazilian population sample, associated to refractive errors (REs) and spectacle need to suggest priorities in preventive programs. METHODS: A cross-sectional study was conducted in nine counties of the southeast region of Brazil, using a systematic sampling of households, between March 2004 and July 2005. The population was defined as individuals aged between 1 and 96y, inhabitants of 3600 residences to be evaluated and 3012 households were included, corresponding to 8010 subjects considered for participation in the survey, of whom 7654 underwent ophthalmic examinations...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27984362/efficacy-of-intrastromal-corneal-ring-segments-combined-with-flash-collagen-cross-linking-in-keratoconus
#8
Carlos H Gordillo, Juan C Grandin, Roger Zaldivar, Roberto Zaldivar, Adriana C Lotfi
PURPOSE: To evaluate outcomes, efficacy, and safety of intrastromal corneal ring segment implantation for treatment of keratoconus combined with collagen cross-linking (CXL) with 1-year follow-up. METHODS: One hundred nineteen eyes of 82 patients with keratoconus (37 females) underwent femtosecond (Intralase FS; Abbott Medical Optics, Inc) laser-assisted intrastromal corneal ring segment implantation (INTRASEG; Gamma Vision) with flash CXL (18 mW/cm for 5 minutes)...
December 14, 2016: Cornea
https://www.readbyqxmd.com/read/27980362/effectiveness-of-toric-orthokeratology-in-the-treatment-of-patients-with-combined-myopia-and-astigmatism
#9
Byul Lyu, Kyu Yeon Hwang, Sun Young Kim, Su Young Kim, Kyung Sun Na
PURPOSE: The purpose of this multi-institute, single-group clinical trial was to evaluate the effectiveness and safety of toric orthokeratology lenses for the treatment of patients with combined myopia and astigmatism. METHODS: A total of 44 patients were included in this clinical trial. The patients ranged in age from 7 to 49 years, with myopia of -0.75 to -6.0 diopters (D) and astigmatism of 1.25 to 4.0 D. After excluding 21 subjects, 23 subjects (39 eyes) were analyzed after toric orthokeratology lens use...
December 2016: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/27979835/population-based-assessment-of-prevalence-and-causes-of-visual-impairment-in-the-state-of-telangana-india-a-cross-sectional-study-using-the-rapid-assessment-of-visual-impairment-ravi-methodology
#10
Srinivas Marmamula, Rohit C Khanna, Eswararao Kunkunu, Gullapalli N Rao
OBJECTIVE: To assess the prevalence and causes of visual impairment (VI) among a rural population aged 40 years and older in the state of Telangana in India. DESIGN: Population-based cross-sectional study. SETTING: Districts of Adilabad and Mahbubnagar in south Indian state of Telangana, India. PARTICIPANTS: A sample of 6150 people was selected using cluster random sampling methodology. A team comprising a trained vision technician and a field worker visited the households and conducted the eye examination...
December 15, 2016: BMJ Open
https://www.readbyqxmd.com/read/27966943/poly-vinyl-alcohol-hydrogels-reinforced-with-nanocellulose-for-ophthalmic-applications-general-characteristics-and-optical-properties
#11
Gopi Krishna Tummala, Ramiro Rojas, Albert Mihranyan
Globally, uncorrected refractive errors are one of the main causes of visual impairment, and contact lenses form an important part of modern day eye care and culture. Several hydrogels with varying physicochemical properties are in use to manufacture soft contact lenses. Hydrogels are generally too soft and reinforcement with appropriate materials is desirable to achieve high water content without compromising mechanical properties. In this study, we have developed a highly transparent macroporous hydrogel with water content >90%, by combining poly(vinyl alcohol) with nanocellulose...
December 29, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/27960616/five-year-incidence-of-visual-impairment-in-middle-aged-iranians-the-shahroud-eye-cohort-study
#12
Hassan Hashemi, Shiva Mehravaran, Mohammad Hassan Emamian, Akbar Fotouhi
PURPOSE: To study the 5-year incidence of visual impairment and its causes and risk factors, in the middle-aged Iranian sample of the Shahroud Eye Cohort Study (ShECS). METHODS: Data from subjects who had participated in both phases of the ShECS were used to determine age- and sex-specific incidence rates of visual impairment using the World Health Organization (WHO) definitions for bilateral low vision (visual acuity, VA, >0.5 and ≤1.3 LogMAR in the better eye) and blindness (VA worse than 1...
February 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/27960580/prevalence-and-causes-of-visual-impairment-and-blindness-among-cocoa-farmers-in-ghana
#13
Samuel Bert Boadi-Kusi, Rekha Hansraj, Khathutshelo Percy Mashige, Alfred Osafo-Kwaako, Alex Azuka Ilechie, Samuel Abokyi
PURPOSE: To determine the prevalence and causes of visual impairment and blindness among cocoa farmers in Ghana in order to formulate early intervention strategies. METHODS: A cross-sectional study using multistage random sampling from four cocoa growing districts in Ghana was conducted from November 2013 to April 2014. A total of 512 cocoa farmers aged 40 years and older were interviewed and examined. The brief interview questionnaire was administered to elicit information on the demographics and socioeconomic details of participants...
February 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/27956283/single-step-transepithelial-photorefractive-keratectomy-in-myopia-and-astigmatism-18-month-follow-up
#14
Soheil Adib-Moghaddam, Saeed Soleyman-Jahi, Bahram Salmanian, Amir-Houshang Omidvari, Fatemeh Adili-Aghdam, Farsad Noorizadeh, Medi Eslani
PURPOSE: To evaluate the long-term quantitative and qualitative optical outcomes of 1-step transepithelial photorefractive keratectomy (PRK) to correct myopia and astigmatism. SETTING: Bina Eye Hospital, Tehran, Iran. DESIGN: Prospective interventional case series. METHODS: Eyes with myopia with or without astigmatism were evaluated. One-step transepithelial PRK was performed with an aberration-free aspheric optimized profile and the Amaris 500 laser...
November 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27939806/implantable-collamer-lens-for-correction-of-ametropia-in-eyes-with-corneal-scarring
#15
A I Ruiz-Rizaldos, J Baviera-Sabater, J Ortega-Usobiaga
CASES: Two cases are reported in which implantation of a collagen copolymer phakic intraocular lens (implantable collamer lens) corrected refractive errors in eyes with corneal scarring. A previous accident, in both cases, resulted in a central linear scar on the surface of the cornea of one eye. In the first patient, a corneal scar was visible in the left eye. The distance corrected visual acuity was 0.3 (-7.75 -4×160°). An uncorrected distance visual acuity of 0.25 was obtained by implanting an implantable collamer lens...
December 8, 2016: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/27930796/surgical-correction-of-presbyopic-ametropia-with-non-refractive-transparent-corneal-inlay-and-an-implantable-collamer-lens
#16
Carlos Gutierrez Amoros
PURPOSE: To report the clinical outcomes of two patients implanted with the Raindrop Near Vision Inlay (ReVision Optics, Inc., Lake Forest, CA) to correct for presbyopia and the Visian implantable collamer lens (ICL) (STAAR Surgical, Monrovia, CA) to correct refractive error. METHODS: Case report. RESULTS: Two patients with presbyopic ametropia complained of blurred vision for distance and near. Both patients received a corneal inlay in the non-dominant eye followed by the Raindrop Inlay the following day...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27918589/outcomes-of-cataract-surgery-in-urban-and-rural-population-in-the-south-indian-state-of-andhra-pradesh-rapid-assessment-of-visual-impairment-ravi-project
#17
Srinivas Marmamula, Rohit C Khanna, Konegari Shekhar, Gullapalli N Rao
OBJECTIVE: To assess the visual outcomes after cataract surgery among urban and rural population aged ≥40 years in the South India state of Andhra Pradesh. METHODS: A population based cross-sectional study was conducted in which 7800 subjects were sampled from two rural and one urban location. Visual Acuity was assessed and eye examination were performed by trained personnel. A questionnaire was used to collect personal and demographic information, and history of cataract surgery...
2016: PloS One
https://www.readbyqxmd.com/read/27893524/visual-outcomes-after-smile-lasek-and-lasek-combined-with-corneal-collagen-cross-linking-for-high-myopic-correction
#18
Sangyoon Hyun, Seongjun Lee, Jae-Hyung Kim
PURPOSE: To compare the visual and refractive outcomes of small-incision lenticule extraction (SMILE), laser-assisted subepithelial keratomileusis (LASEK), and LASEK combined with corneal collagen cross-linking (LASEK-CXL) surgery for high-degree myopia. METHODS: Medical records of patients with spherical equivalent (SE) greater than -6.00 diopters (D) treated with SMILE, LASEK, and LASEK-CXL were reviewed. Uncorrected distance visual acuity (UCVA), SE, and corneal haze were followed up in the 3 groups for 6 months...
November 23, 2016: Cornea
https://www.readbyqxmd.com/read/27893092/global-patterns-in-health-burden-of-uncorrected-refractive-error
#19
Lixia Lou, Chunlei Yao, Yanhua Jin, Victor Perez, Juan Ye
Purpose: To evaluate the global patterns in health burden of uncorrected refractive error (URE) by year, age and sex, region, and socioeconomic status, using disability-adjusted life years (DALYs). Methods: Global, regional, or national DALY numbers, crude DALY rates, and age-standardized DALY rates caused by URE, by year, or age and sex, were obtained from the Global Burden of Disease Study 2013. Human development index (HDI) in 2013 as a national socioeconomic indicator was obtained from the Human Development Report...
November 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27865728/the-prevalence-and-demographic-associations-of-presenting-near-vision-impairment-among-adults-living-in-the-united-states
#20
Nazlee Zebardast, David S Friedman, Susan Vitale
PURPOSE: Estimate prevalence of presenting near-vision impairment (PNVI) among people =50years in the United States (US) and examine associations with socio-demographic characteristics. DESIGN: Cross-sectional study METHODS: 11016 of 12781 (88.5%) US adults =50 years participated in the National Health and Nutrition Examination Survey (NHANES) between 1999-2008 with recorded near visual acuity. PNVI was defined as presenting near-vision worse than 20/40; functional near-vision impairment (FNVI) was defined as at least "moderate-difficulty" with either reading newsprint or near-work...
November 16, 2016: American Journal of Ophthalmology
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