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Uncorrected refractive error

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https://www.readbyqxmd.com/read/28430177/the-prevalence-of-visual-impairment-and-blindness-in-underserved-rural-areas-a-crucial-issue-for-future
#1
H Hashemi, A Yekta, E Jafarzadehpur, A Doostdar, H Ostadimoghaddam, M Khabazkhoob
PurposeTo determine the prevalence of visual impairment and blindness in underserved Iranian villages and to identify the most common cause of visual impairment and blindness.Patients and methodsMultistage cluster sampling was used to select the participants who were then invited to undergo complete examinations. Optometric examinations including visual acuity, and refraction were performed for all individuals. Ophthalmic examinations included slit-lamp biomicroscopy and ophthalmoscopy. Visual impairment was determined according to the definitions of the WHO and presenting vision...
April 21, 2017: Eye
https://www.readbyqxmd.com/read/28426857/spectacle-wear-among-children-in-a-school-based-program-for-ready-made-vs-custom-made-spectacles-in-india-a-randomized-clinical-trial
#2
Priya Morjaria, Jenifer Evans, Kaushik Murali, Clare Gilbert
Importance: Uncorrected refractive errors are the most common cause of visual impairment in children despite correction being highly cost-effective. Objective: To determine whether less expensive ready-made spectacles produce rates of spectacle wear at 3 to 4 months comparable to those of more expensive custom-made spectacles among eligible school-aged children. Design, Setting, and Participants: This noninferiority, double-masked, randomized clinical trial recruited children aged 11 to 15 years from January 12 through July 31, 2015, from government schools in urban and periurban areas surrounding Bangalore, India...
April 20, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28410722/visual-outcomes-of-laser-vision-correction-in-eyes-with-preoperative-amblyopia
#3
Nir Sorkin, David Varssano, David Smadja, Ainat Klein, Michael Mimouni, Amir Rosenblatt
PURPOSE: To evaluate the visual outcomes of photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) in amblyopic eyes. SETTING: Care Vision Refractive Clinic, Tel Aviv, Israel. DESIGN: Retrospective case series. METHODS: Amblyopic eyes of patients with a preoperative corrected distance visual acuity (CDVA) of 20/33 or worse had PRK or LASIK. Postoperative visual outcomes (uncorrected distance visual acuity, CDVA) and correlations with age, preoperative CDVA, refractive error type, astigmatism grade, procedure type, laser suite model, amblyopia grade, and amblyopia type were analyzed...
March 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28407009/treatment-coverage-rates-for-refractive-error-in-the-national-eye-health-survey
#4
Joshua Foreman, Jing Xie, Stuart Keel, Hugh R Taylor, Mohamed Dirani
OBJECTIVE: To present treatment coverage rates and risk factors associated with uncorrected refractive error in Australia. METHODS: Thirty population clusters were randomly selected from all geographic remoteness strata in Australia to provide samples of 1738 Indigenous Australians aged 40 years and older and 3098 non-Indigenous Australians aged 50 years and older. Presenting visual acuity was measured and those with vision loss (worse than 6/12) underwent pinhole testing and hand-held auto-refraction...
2017: PloS One
https://www.readbyqxmd.com/read/28396877/visual-and-refractive-outcomes-following-implantation-of-a-new-trifocal-intraocular-lens
#5
Michael Lawless, Chris Hodge, Joe Reich, Lewis Levitz, Uday K Bhatt, Colm McAlinden, Kate Roberts, Timothy V Roberts
BACKGROUND: Independence from all optical aids, and freedom from unwanted symptoms, following cataract and lens surgery remains the ultimate goal of both patient and surgeon. The development of trifocal IOL technology provides an ever-increasing range of options. The purpose of our study is to understand the predictability, safety and efficacy of a new trifocal intraocular lens (IOL) following cataract or refractive lens exchange (RLE) surgery. METHODS: This was a retrospective consecutive case series of patients undergoing cataract extraction or RLE followed by implantation of the Alcon IQ Panoptix IOL...
2017: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/28393041/refractive-error-study-in-young-subjects-results-from-a-rural-area-in-paraguay
#6
Isabel Signes-Soler, José Luis Hernández-Verdejo, Miguel Angel Estrella Lumeras, Elena Tomás Verduras, David P Piñero
AIM: To evaluate the distribution of refractive error in young subjects in a rural area of Paraguay in the context of an international cooperation campaign for the prevention of blindness. METHODS: A sample of 1466 young subjects (ranging from 3 to 22 years old), with a mean age of 11.21±3.63 years old, were examined to assess their distance visual acuity (VA) and refractive error. The first screening examination performed by trained volunteers, included visual acuity testing, autokeratometry and non-cycloplegic autorefraction...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28388923/effectiveness-of-a-novel-mobile-health-education-intervention-peek-on-spectacle-wear-among-children-in-india-study-protocol-for-a-randomized-controlled-trial
#7
Priya Morjaria, Andrew Bastawrous, Gudlavalleti Venkata Satyanarayana Murthy, Jennifer Evans, Clare Gilbert
BACKGROUND: Uncorrected refractive errors are the commonest cause of visual loss in children despite spectacle correction being highly cost-effective. Many affected children do not benefit from correction as a high proportion do not wear their spectacles. Reasons for non-wear include parental attitudes, overprescribing and children being teased/bullied. Most school programmes do not provide health education for affected children, their peers, teachers or parents. The Portable Eye Examination Kit (Peek) will be used in this study...
April 8, 2017: Trials
https://www.readbyqxmd.com/read/28388896/comparison-of-ocular-higher-order-aberrations-after-smile-and-wavefront-guided-femtosecond-lasik-for-myopia
#8
Xiaoqin Chen, Yan Wang, Jiamei Zhang, Shun-Nan Yang, Xiaojing Li, Lin Zhang
BACKGROUND: To compare changes in higher-order aberrations (HOAs) following small incision lenticule extraction (SMILE) and wavefront-guided femtosecond laser-assisted in situ keratomileusis (WFG FS-LASIK), and to investigate correlations between preoperative spherical equivalence (SE) and components of HOAs affecting visual quality. METHODS: Sixty-five myopic eyes from 38 patients were enrolled in the study retrospectively, either having undergone SMILE or WFG FS-LASIK...
April 7, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28387767/femtosecond-laser-assisted-in-situ-keratomileusis-for-the-correction-of-residual-ametropia-after-deep-anterior-lamellar-keratoplasty-a-pilot-investigation
#9
A Balestrazzi, A Balestrazzi, F Menicacci, G Cartocci, F Menicacci, P Michieletto, E Balestrazzi
PurposeTo evaluate the refractive and visual results of one-stage laser-assisted in situ keratomileusis with femtosecond laser (Femto-LASIK) for the correction of residual ametropia after deep anterior lamellar keratoplasty (DALK).MethodsThis retrospective study included 13 eyes of 12 patients, who underwent corneal Femto-LASIK to correct refractive errors after DALK. IntraLase FS150 was used to create a lamellar flap and excimer laser ablation for refractive correction was performed using the Star S4 IR Excimer Laser in eight cases and the Technolas 217z Excimer Laser in Tissue Saving mode in five cases...
April 7, 2017: Eye
https://www.readbyqxmd.com/read/28383074/phenotypic-and-genotypic-correlation-between-myopia-and-intelligence
#10
Katie M Williams, Pirro G Hysi, Ekaterina Yonova-Doing, Omar A Mahroo, Harold Snieder, Christopher J Hammond
Myopia, or near-sightedness, is our most common eye condition and the prevalence is increasing globally. Visual impairment will occur if uncorrected, whilst high myopia causes sight-threatening complications. Myopia is associated with higher intelligence. As both are heritable, we set out to examine whether there is a genetic correlation between myopia and intelligence in over 1,500 subjects (aged 14-18 years) from a twin birth cohort. The phenotypic correlation between refractive error and intelligence was -0...
April 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28379859/refractive-error-in-underserved-adults-causes-and-potential-solutions
#11
V Swetha E Jeganathan, Alan L Robin, Maria A Woodward
PURPOSE OF REVIEW: To evaluate the epidemiology of uncorrected refractive errors (URE) in adults both in the United States and globally, health outcomes impacted by URE, common barriers to treatment, and propose potential interventions. RECENT FNDINGS: URE is the main cause of visual impairment and the second leading cause of blindness globally. Rates of URE are rising, and cause disability that reduces productivity, economic earnings, and the quality of life of affected individuals...
April 4, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/28366374/sequential-intrastromal-corneal-ring-segment-and-monofocal-intraocular-lens-implantation-for-keratoconus-and-cataract-long-term-follow-up
#12
José F Alfonso, Carlos Lisa, Luis Fernández-Vega Cueto, Arancha Poo-López, David Madrid-Costa, Luis Fernández-Vega
PURPOSE: To evaluate the efficacy, safety, predictability, and stability of sequential Ferrara intrastromal corneal ring segment (ICRS) and intraocular lens (IOL) implantation in patients with keratoconus and cataract. SETTING: Fernández-Vega Ophthalmological Institute, Oviedo, Spain. DESIGN: Retrospective case series. METHODS: This study comprised patients with keratoconus and cataract who had ICRS implantation followed 6 months later by IOL implantation...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28366363/comparison-of-clinical-outcomes-between-wavefront-optimized-versus-corneal-wavefront-guided-transepithelial-photorefractive-keratectomy-for-myopic-astigmatism
#13
Ikhyun Jun, David Sung Yong Kang, Jerry Tan, Jin Young Choi, Woon Heo, Joo Young Kim, Min Goo Lee, Eung Kweon Kim, Kyoung Yul Seo, Tae-Im Kim
PURPOSE: To evaluate and compare the clinical outcomes, including visual acuity, refractive errors, and aberrations, between aberration-free transepithelial photorefractive keratectomy (PRK) and corneal wavefront-guided transepithelial PRK in eyes with myopic astigmatism. SETTING: Yonsei University College of Medicine and Eyereum Eye Clinic, Seoul, South Korea. DESIGN: Retrospective comparative case series. METHODS: Patients with myopic astigmatism were treated with aberration-free transepithelial PRK or corneal wavefront-guided transepithelial PRK using a 1050 Hz high-repetition excimer laser...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28362137/magnitude-and-determinants-of-the-ratio-between-prevalence-of-low-vision-and-blindness-in-rapid-assessment-of-avoidable-blindness-surveys
#14
Dinesh Kaphle, Susan Lewallen
PURPOSE: To determine the magnitude and determinants of the ratio between prevalence of low vision and prevalence of blindness in rapid assessment of avoidable blindness (RAAB) surveys globally. METHODS: Standard RAAB reports were downloaded from the repository or requested from principal investigators. Potential predictor variables included prevalence of uncorrected refractive error (URE) as well as gross domestic product (GDP) per capita, health expenditure per capita of the country across World Bank regions...
March 31, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28337058/comparison-of-microkeratome-assisted-sub-bowman-keratomileusis-with-photorefractive-keratectomy
#15
Talal A Althomali
PURPOSE: To compare the outcomes of photorefractive keratectomy (PRK) and thin-flap Laser-Assisted in Situ Keratomileusis/sub-Bowman keratomileusis (SBK) with intended flap thicknesses of 100 μm using the One Use-Plus SBK microkeratome. METHODS: Ninety-eight eyes of 52 subjects with myopic manifest refraction spherical equivalent (MRSE) of up to -5 diopters (D), a stable refraction for 1 year and a corrected distance visual acuity (CDVA) of at least 20/20 in each eye which had undergone SBK or PRK were reviewed retrospectively...
January 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28332896/the-distribution-of-macular-thickness-and-its-determinants-in-a-healthy-population
#16
Hassan Hashemi, Mehdi Khabazkhoob, AbbasAli Yekta, Mohammad Hassan Emamian, Payam Nabovati, Akbar Fotouhi
PURPOSE: To determine the distribution of macular thickness in a healthy Iranian population aged 45-69 years and its association with certain determinants. METHODS: All participants underwent optometric examinations including measurement of uncorrected and corrected visual acuity, objective refraction by retinoscopy, and subjective refraction. Subsequently, all participants underwent slit-lamp biomicroscopy followed by fundus examination through direct and indirect ophthalmoscopy, and optical coherence tomography (OCT) imaging under pupil dilation...
March 23, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28317667/small-incision-lenticule-extraction-in-a-patient-with-congenital-nystagmus
#17
Bu Ki Kim, Su Joung Mun, Dae Gyu Lee, Hyun Tae Choi, Young Taek Chung
We report a case of a 23-year-old woman with congenital nystagmus who had small-incision lenticule extraction (SMILE) procedure to correct refractive errors. The manifest refraction was -5.50 -1.75 × 180 in the right eye, -5.0 -2.50 × 180 in the left eye, and the patient presented with horizontal pendular nystagmus with an amplitude range of 5 to 10 degrees. Uneventful simultaneous bilateral small-incision lenticule extraction was performed. Six months postoperatively, the uncorrected distance visual acuity was 20/18 with -0...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28293434/visual-motor-and-perceptual-task-performance-in-astigmatic-students
#18
Erin M Harvey, J Daniel Twelker, Joseph M Miller, Tina K Leonard-Green, Kathleen M Mohan, Amy L Davis, Irene Campus
Purpose. To determine if spectacle corrected and uncorrected astigmats show reduced performance on visual motor and perceptual tasks. Methods. Third through 8th grade students were assigned to the low refractive error control group (astigmatism < 1.00 D, myopia < 0.75 D, hyperopia < 2.50 D, and anisometropia < 1.50 D) or bilateral astigmatism group (right and left eye ≥ 1.00 D) based on cycloplegic refraction. Students completed the Beery-Buktenica Developmental Test of Visual Motor Integration (VMI) and Visual Perception (VMIp)...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28243019/clinical-outcomes-of-an-optimized-prolate-ablation-procedure-for-correcting-residual-refractive-errors-following-laser-surgery
#19
Byunghoon Chung, Hun Lee, Bong Joon Choi, Kyung Ryul Seo, Eung Kwon Kim, Dae Yune Kim, Tae-Im Kim
PURPOSE: The purpose of this study was to investigate the clinical efficacy of an optimized prolate ablation procedure for correcting residual refractive errors following laser surgery. METHODS: We analyzed 24 eyes of 15 patients who underwent an optimized prolate ablation procedure for the correction of residual refractive errors following laser in situ keratomileusis, laser-assisted subepithelial keratectomy, or photorefractive keratectomy surgeries. Preoperative ophthalmic examinations were performed, and uncorrected distance visual acuity, corrected distance visual acuity, manifest refraction values (sphere, cylinder, and spherical equivalent), point spread function, modulation transfer function, corneal asphericity (Q value), ocular aberrations, and corneal haze measurements were obtained postoperatively at 1, 3, and 6 months...
February 2017: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/28225372/spherical-soft-contact-lens-designs-and-peripheral-defocus-in-myopic-eyes
#20
Kelly E Moore, Julia S Benoit, David A Berntsen
PURPOSE: Peripheral retinal defocus has been implicated in myopia progression. The effect of commercially available spherical soft contact lenses (SCLs) on peripheral defocus of adult myopic eyes was investigated. METHODS: Twenty-five young adults with spherical equivalent (SE) refractions between -0.50D and -6.00D were enrolled. Cycloplegic autorefraction (right eye) was measured centrally and ±20°, ±30°, and ±40° from the line of sight along the horizontal meridian using an autorefractor...
March 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
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