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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/29602236/evaluating-glaucomatous-abnormality-in-peripapillary-optical-coherence-tomography-enface-visualisation-of-the-retinal-nerve-fibre-layer-reflectance
#1
Bright S Ashimatey, Brett J King, Stephen A Burns, William H Swanson
PURPOSE: Optical coherence tomography (OCT) enface visualisation of the retinal nerve fibre layer (RNFL) reflectance has been found to have some advantages over retinal thickness measures. However, it is not yet clear how abnormalities on enface images relate to findings of abnormalities from other clinical measures such as the circumpapillary retinal nerve fibre layer thickness (cRNFLT). We developed a technique to analyse the RNFL reflectance on the OCT enface images, and to investigate its relation with the cRNFLT...
March 30, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29574882/prevalence-and-risk-factors-for-myopia-and-other-refractive-errors-in-an-adult-population-in-southern-india
#2
Sanil Joseph, Tiruvengada Krishnan, Ravilla D Ravindran, Giovanni Maraini, Monica Camparini, Usha Chakravarthy, Thulasiraj D Ravilla, Andrew Hutchings, Astrid E Fletcher
PURPOSE: To investigate prevalence and risk factors for myopia, hyperopia and astigmatism in southern India. METHODS: Randomly sampled villages were enumerated to identify people aged ≥40 years. Participants were interviewed for socioeconomic and lifestyle factors and attended a hospital-based ophthalmic examination including visual acuity measurement and objective and subjective measurement of refractive status. Myopia was defined as spherical equivalent (SE) worse than -0...
March 25, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29572900/high-prevalence-and-familial-aggregation-of-keratoconus-in-an-iranian-rural-population-a-population-based-study
#3
Hassan Hashemi, Samira Heydarian, Abbasali Yekta, Hadi Ostadimoghaddam, Mohamadreza Aghamirsalim, Akbar Derakhshan, Mehdi Khabazkhoob
PURPOSE: The objective of this study was to determine the prevalence of keratoconus and the potential effect of genetic and environmental factors on its prevalence in households living in rural areas of Iran in a large population-based study. METHODS: The present cross-sectional study was performed in two Iranian rural populations. Two rural areas were randomly selected in the southwest and north of Iran. All individuals over one year of age were invited to participate in the study...
March 24, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29492992/glaucoma-referral-refinement-in-ireland-managing-the-sensitivity-specificity-paradox-in-optometric-practice
#4
Catriona Barrett, Colm O'Brien, James Loughman
PURPOSE: Glaucoma referral refinement (GRR) has proven a successful demand management strategy for glaucoma suspect cases in the United Kingdom (UK). A GRR clinic was established in Dublin, Ireland to investigate the clinical viability of this pathway outside the UK's National Health Service (NHS) structures, and away from the influence of National Institute for Clinical Excellence (NICE) guidance. METHODS: Glaucoma suspect patients were recruited into the scheme following referral from community optometrists in the greater Dublin area...
February 28, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29405327/quality-indicators-in-a-community-optometrist-led-cataract-shared-care-scheme
#5
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
#6
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
#7
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
#8
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/29485207/clinical-outcomes-of-low-vision-rehabilitation-delivered-by-a-mobile-clinic
#9
Micaela Gobeille, Alexis Malkin, Richard Jamara, Nicole C Ross
PURPOSE: This prospective cohort study examined clinical outcomes of low vision rehabilitation (LVR) delivered by a mobile clinic. METHODS: Participants were recruited from those scheduled for mobile clinic LVR and met the United States definition of legal blindness. Participants completed the Massof Activity Inventory (AI) before LVR, 3 months post-LVR, and 1 year post-LVR. Change scores and measures of clinical effect (i.e. Cohen's effect size and minimum clinically important difference, MCID) were calculated for each time point and compared...
March 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29485206/preventing-falls-in-older-people-with-cataract-it-is-not-just-about-surgery
#10
EDITORIAL
Lisa Keay, Anna Palagyi
No abstract text is available yet for this article.
March 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29485205/author-s-reply
#11
LETTER
David Elliott, Joanne Wood
No abstract text is available yet for this article.
March 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29485204/coloured-filters-and-visual-stress
#12
LETTER
Bruce J W Evans, Peter M Allen
No abstract text is available yet for this article.
March 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
#13
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)...
March 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
#14
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...
March 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
#15
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...
March 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
#16
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...
March 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
#17
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...
March 2018: 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
#18
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...
March 2018: 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
#19
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
#20
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)
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