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Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)

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https://www.readbyqxmd.com/read/29405327/quality-indicators-in-a-community-optometrist-led-cataract-shared-care-scheme
#1
Oliver M B Bowes, Poonam Shah, Mrinal Rana, Sarah Farrell, Madhavan S Rajan
PURPOSE: Cataract shared care schemes involving community optometrists show wide variation in practice. We report on defined key performance indicators (KPIs) which improve accountability between stakeholders. METHODS: In this prospective study over nine months at a UK public hospital, we evaluated the outcomes of consecutive direct cataract referrals from community optometrists against two KPIs agreed under a service-level agreement between the Hospital Eye Service and community optometrists: (1) 85% of patients listed for cataract listing at first consultation; and (2) 90% postoperative feedback return rate on patients discharged to community optometrists...
February 5, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29383756/predicted-accommodative-response-from-image-quality-in-young-eyes-fitted-with-different-dual-focus-designs
#2
Miguel Faria-Ribeiro, Ana Amorim-de-Sousa, José M González-Méijome
PURPOSE: To investigate the separated and combined influences of inner zone (IZ) diameter and effective add power of dual-focus contact lenses (CL) in the image quality at distance and near viewing, in a functional accommodating model eye. METHODS: Computational wave-optics methods were used to define zonal bifocal pupil functions, representing the optic zones of nine dual-focus centre-distance CLs. The dual-focus pupil functions were defined having IZ diameters of 2...
January 31, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29380408/analysing-the-impact-of-myopia-on-the-stiles-crawford-effect-of-the-first-kind-using-a-digital-micromirror-device
#3
Alessandra Carmichael Martins, Brian Vohnsen
PURPOSE: Photoreceptor light acceptance is closely tied to the Stiles-Crawford effect of the first kind (SCE-I). Whether the SCE-I plays a role in myopic development remains unclear although a reduction in directionality has been predicted for high myopia. The purpose of this study is to analyse the relationship between foveal SCE-I directionality, axial eye length, and defocus for emmetropic subjects wearing ophthalmic trial lenses during psychophysical measurements and for myopic subjects with their natural correction...
January 30, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29380406/foveal-vision-power-errors-induced-by-spectacle-lenses-designed-to-correct-peripheral-refractive-errors
#4
Sergio Barbero, Miguel Faria-Ribeiro
PURPOSE: Radial Refractive Gradient (RRG) spectacles are lenses specifically designed to minimize peripheral hyperopic defocus typically found in conventional spectacles. Our goals were: (1) to demonstrate a method to design such lenses; and (2) to quantify the exact foveal vision power errors induced by them. METHODS: The design procedure was based on a point-by-point sequential surface construction algorithm that designs a front aspheric surface (back surface is spherical) to achieve a given overall tangential focal length of the lens...
January 30, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29356022/optical-treatment-of-amblyopia-in-older-children-and-adults-is-essential-prior-to-enrolment-in-a-clinical-trial
#5
Tina Y Gao, Nicola Anstice, Raiju J Babu, Joanna M Black, William R Bobier, Shuan Dai, Cindy X Guo, Robert F Hess, Michelle Jenkins, Yannan Jiang, Lisa Kearns, Lionel Kowal, Carly S Y Lam, Peter C K Pang, Varsha Parag, Jayshree South, Sandra Elfride Staffieri, Angela Wadham, Natalie Walker, Benjamin Thompson
PURPOSE: Optical treatment alone can improve visual acuity (VA) in children with amblyopia, thus clinical trials investigating additional amblyopia therapies (such as patching or videogames) for children require a preceding optical treatment phase. Emerging therapies for adult patients are entering clinical trials. It is unknown whether optical treatment is effective for adults with amblyopia and whether an optical correction phase is required for trials involving adults. METHODS: We examined participants who underwent optical treatment in the Binocular Treatment for Amblyopia using Videogames (BRAVO) clinical trial (ANZCTR ID: ACTRN12613001004752)...
January 22, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29315718/experimental-investigation-of-accommodation-in-eyes-fit-with-multifocal-contact-lenses-using-a-clinical-auto-refractor
#6
Basal H Altoaimi, Pete Kollbaum, Dawn Meyer, Arthur Bradley
PURPOSE: Multifocal or multi-zone contact lenses are increasingly being fit to young eyes in an attempt to control myopia progression. However, success in achieving this aim may depend on how much the eye accommodates. The purpose of the current work was to evaluate the ability of an open-field clinical autorefractor to measure on-axis refractive state and accommodation in eyes fit with multifocal contact lenses (CLs). METHODS: Refractive state was measured with a Grand Seiko WAM-5500 autorefractor (www...
January 8, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29315706/a-basis-for-customising-perimetric-locations-within-the-macula-in-glaucoma
#7
Muhammed S Alluwimi, William H Swanson, Victor E Malinovsky, Brett J King
PURPOSE: It has been recognised that the 24-2 grid used for perimetry may poorly sample the macula, which has been recently identified as a critical region for diagnosing and managing patients with glaucoma. We compared data derived from patients and controls to investigate the efficacy of a basis for customising perimetric locations within the macula, guided by en face images of retinal nerve fibre layer (RNFL) bundles. METHODS: We used SD-OCT en face montages (www...
January 8, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29315705/detecting-glaucomatous-progression-with-infrequent-visual-field-testing
#8
Andrew J Anderson, Rashima Asokan, Hiroshi Murata, Ryo Asaoka
PURPOSE: Previous work has investigated whether a significant regression slope in the first 2 years for the summary index Mean Deviation (MD) is predictive of rapid (≤-2 dB year-1 ) glaucomatous visual field progression. This work assumed six visual fields were obtained as per management guidelines, but in clinical practice commonly only two or three fields are measured. We used simulation methods to investigate how reducing test frequency influences the prediction of rapid visual field progression, along with the influence of including criteria based on regression slope...
January 8, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29285779/analysing-the-ocular-biometry-of-new-born-infants
#9
Jos J Rozema, Zvi Herscovici, Moshe Snir, Ruth Axer-Siegel
PURPOSE: To model and analyse the ocular biometry of new-born infants. METHODS: This work is based on previously published data of a cohort of 66 new-born infants aged 0-3 days. After exclusion of seven myopic subjects, the available retinoscopy, keratometry and ultrasound biometry data were analysed, along with calculated parameters such as lens power and whole eye power. RESULTS: Male infants have significantly flatter corneas that female infants (Mann-Whitney U test, p < 0...
December 29, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29280165/computer-monitor-pixellation-and-sloan-letter-visual-acuity-measurement
#10
Andrew Carkeet, Lucas J Lister
PURPOSE: To assess the effects of changing computer monitor pixel density on visual acuity measurements made using Sloan optotypes. METHODS: Acuity was measured on 10 participants aged 19 to 38 years (mean 27.9 ± 7.0) measured binocularly wearing their best spectacle correction. Stimuli were eight lines of five Sloan letter optotypes in logarithmic progression, ranging in size from -0.4 to 0.3 logMAR. Test distance was varied so that pixels on the monitor ranged in size from 0...
December 26, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265476/intraocular-light-scatter-reflections-fluorescence-and-absorption-what-we-see-in-the-slit-lamp
#11
REVIEW
Thomas J T P van den Berg
PURPOSE: Much knowledge has been collected over the past 20 years about light scattering in the eye- in particular in the eye lens- and its visual effect, called straylight. It is the purpose of this review to discuss how these insights can be applied to understanding the slit lamp image. RESULTS: The slit lamp image mainly results from back scattering, whereas the effects on vision result mainly from forward scatter. Forward scatter originates from particles of about wavelength size distributed throughout the lens...
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265475/simulation-of-a-central-scotoma-using-contact-lenses-with-an-opaque-centre
#12
Essam S Almutleb, Arthur Bradley, Jason Jedlicka, Shirin E Hassan
PURPOSE: This study evaluated the feasibility of using soft contact lenses (CLs) with an opaque centre to induce absolute central scotomas that move with the eye. We examined the geometrical optics prediction that scotoma size will vary with the size of the CL's opaque centre and with ocular pupil size. We also tested the hypothesis that high environmental light levels will ensure that the ocular pupil will remain small enough, even with opaque centre CLs, to generate absolute scotomas representative of those experienced by patients with age-related macular disease...
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265474/iris-colour-in-relation-to-myopia-among-chinese-school-aged-children
#13
Chen-Wei Pan, Qin-Xiao Qiu, Deng-Juan Qian, Dan-Ning Hu, Jun Li, Seang-Mei Saw, Hua Zhong
PURPOSE: Understanding the association of iris colour and myopia may provide further insights into the role of the wavelength of lights in the pathophysiology of myopia. We aim to assess the association of iris colour and myopia in a school-based sample of Chinese students. METHODS: Two thousand three hundred and forty-six Year 7 students from 10 middle schools (93.5% response rate) aged 13-14 years in Mojiang, a small county located in Southwestern China, participated in the study...
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265473/professor-david-henson-festspiele-manchester-january-2017
#14
Robert Harper, Cecilia Fenerty
No abstract text is available yet for this article.
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265472/prevalence-of-vision-loss-among-hospital-in-patients-a-risk-factor-for-falls
#15
Susan J Leat, Aleksandra A Zecevic, Alexis Keeling, Denise Hileeto, Tammy Labreche, Christopher Brymer
PURPOSE: Despite poor vision being a risk factor for falls, current hospital policies and practices often do not include a vision assessment at patient admission or in the hospital's incident reporting system when a fall occurs. Our purpose was to document the prevalence of vision loss in hospital general medicine units to increase awareness of poor vision as a potential risk factor for falls that occur within the hospital, and inform future preventative practice. METHODS: This cross-sectional study took place in medicine units of an acute care hospital...
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265471/visual-resolution-and-cone-spacing-in-the-nasal-and-inferior-retina
#16
Kelly Woog, Richard Legras
PURPOSE: To determine the retinal eccentricity at which cones are no longer an observable substitute for ganglion cells on nasal and inferior parafoveal visual acuity. METHOD: Visual acuities were measured on 12 healthy volunteers, under dynamic adaptive optic aberrations correction (crx1™) in white light, from 0° to 6°, every two degrees, along the nasal and inferior retinal meridians. Cone spacing was measured on images of the retina acquired using an adaptive optic flood illumination retina camera (rtx1™) at the same eccentricity, except at 0°...
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265470/what-is-the-most-appropriate-citation-metric-for-a-clinical-journal
#17
EDITORIAL
David B Elliott
No abstract text is available yet for this article.
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265469/reducing-starbursts-in-highly-aberrated-eyes-with-pupil-miosis
#18
Renfeng Xu, Pete Kollbaum, Larry Thibos, Norberto Lopez-Gil, Arthur Bradley
PURPOSE: To test the hypothesis that marginal ray deviations determine perceived starburst sizes, and to explore different strategies for decreasing starburst size in highly aberrated eyes. METHODS: Perceived size of starburst images and visual acuities were measured psychophysically for eyes with varying levels of spherical aberration, pupil sizes, and defocus. Computationally, we use a polychromatic eye model including the typical levels of higher order aberrations (HOAs) for keratoconic and post-LASIK eyes to quantify the image quality (the visually weighted Strehl ratio derived from the optical transfer function, VSOTF) with different pupil sizes at both photopic and mesopic light levels...
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29265468/the-reading-accessibility-index-and-quality-of-reading-grid-of-patients-with-central-vision-loss
#19
Luminita Tarita-Nistor, Esther G González, Mark S Mandelcorn, Michael H Brent, Samuel N Markowitz, Martin J Steinbach
PURPOSE: In this study we evaluated the reading accessibility index (ACC) and a quality of reading grid as assessment tools for reading and as outcome measures for reading rehabilitation of patients with central vision loss. METHODS: Reading performances on the MNRead chart (www.precision-vision.com) were reviewed from our research database. Participants were 24 controls with normal vision [mean age: 34 (SD, 14) years] and 61 patients with bilateral central vision loss [mean age: 81 (SD, 9) years] among which a subgroup of 18 patients [mean age, 76 (SD, 13) years] had undergone perceptual learning training for reading rehabilitation...
January 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29168194/retinal-putative-glial-alterations-implication-for-glaucoma-care
#20
Bright S Ashimatey, Brett J King, William H Swanson
PURPOSE: Gliosis-like retinal alterations, presumed to be activated retinal astrocytes and Müller cells (ARAM), have been reported to occur frequently in patients with glaucoma but rarely in controls. We investigated the association between glaucomatous abnormality and the presence, the extent of retinal region, and the spatial distribution, of hyperreflective retinal alterations on optical coherence tomography (OCT) en-face images, presumed to be ARAM. METHODS: Findings of hyperreflective structures, presumed to be ARAM, in the central retinal ±24 degrees of OCT en-face images (acquired with the SPECTRALIS(®) OCT) were compared between 35 younger controls, 42 older controls and 38 patients with glaucoma...
November 23, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
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