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Optometry and Vision Science: Official Publication of the American Academy of Optometry

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https://www.readbyqxmd.com/read/28079738/vision-problems-and-reduced-reading-outcomes-in-queensland-schoolchildren
#1
Shelley Hopkins, Geoff P Sampson, Peter L Hendicott, Joanne M Wood
PURPOSE: To assess the relationship between vision and reading outcomes in Indigenous and non-Indigenous schoolchildren to determine whether vision problems are associated with lower reading outcomes in these populations. METHODS: Vision testing and reading assessments were performed on 508 Indigenous and non-Indigenous schoolchildren in Queensland, Australia divided into two age groups: Grades 1 and 2 (6-7 years of age) and Grades 6 and 7 (12-13 years of age). Vision parameters measured included cycloplegic refraction, near point of convergence, heterophoria, fusional vergence range, rapid automatized naming, and visual motor integration...
January 12, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28033161/relative-difficulties-of-daily-living-tasks-with-retinitis-pigmentosa
#2
Keziah Latham, Mohammad Baranian, Matthew A Timmis, Andy Fisher, Shahina Pardhan
PURPOSE: To determine the relative difficulty of activity of daily living tasks for people with retinitis pigmentosa (RP). METHODS: Participants with RP (n = 166) rated the difficulty of tasks (n = 43) underpinning the Dutch Activity Inventory goals of mobility indoors and outdoors, shopping, and using public transport. Demographic characteristics were also determined. Responses were Rasch analyzed to determine properties of the scale, derive unidimensional subscales, and consider differential item functioning (DIF)...
December 29, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28033160/substance-p-in-flush-tears-and-schirmer-strips-of-healthy-participants
#3
Maria Markoulli, Moneisha Gokhale, Jingjing You
PURPOSE: To determine the repeatability of the flush tear collection technique and the Schirmer strip for Substance P tear analysis. METHODS: The tears of 10 healthy non-contact-lens wearers were collected via Schirmer strip and microcapillary following instillation of either 20 μL (F-20) or 60 μL (F-60) of saline. Each technique was conducted on two occasions and in a randomized order. Total protein content (TPC) and Substance P concentrations were determined...
December 29, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28030516/scotoma-visibility-and-reading-rate-with-bilateral-central-scotomas
#4
Joshua D Pratt, Scott B Stevenson, Harold E Bedell
PURPOSE: In this experiment, we tested whether perceptually delineating the scotoma location and border with a gaze contingent polygon overlay improves reading speed and reading eye movements in patients with bilateral central scotomas. METHODS: Eight patients with age-related macular degeneration and bilateral central scotomas read aloud MNRead style sentences with their preferred eye. Eye movement signals from an EyeLink II eyetracker were used to create a gaze contingent display in which a polygon overlay delineating the area of the patient's scotoma was superimposed on the text during 18 of the 42 trials...
December 27, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28027276/accommodation-and-phoria-in-children-wearing-multifocal-contact-lenses
#5
Celia R Gong, David Troilo, Kathryn Richdale
PURPOSE: To determine the effect of multifocal contact lenses on accommodation and phoria in children. METHODS: This was a prospective, non-dispensing, randomized, crossover, single-visit study. Myopic children with normal accommodation and binocularity and no history of myopia control treatment were enrolled and fitted with CooperVision Biofinity single vision (SV) and multifocal (MF, +2.50D center distance add) contact lenses. Accommodative responses (photorefraction) and phorias (modified Thorington) were measured at four distances (>3 m, 100 cm, 40 cm, 25 cm)...
December 23, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28027275/development-of-a-keratoconus-specific-questionnaire-using-rasch-analysis
#6
Jyoti Khadka, Paul G Schoneveld, Konrad Pesudovs
PURPOSE: To develop and validate a keratoconus-specific quality of life (QoL) questionnaire: the Keratoconus Outcomes Research Questionnaire (KORQ). METHODS: The study was carried out in three phases. Phase I: content identifications: items were identified based on an extensive literature review, open-ended patient mail survey, and expert consultations. Each item was scored on a visual analog scale (VAS). Phase II: pilot testing using Rasch analysis. Phase III: testing psychometric properties of the final version of the KORQ...
December 23, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28027274/effect-of-accommodation-on-peripheral-eye-lengths-of-emmetropes-and-myopes
#7
Hussain Aldossari, Marwan Suheimat, David A Atchison, Katrina L Schmid
PURPOSE: To investigate the effect of accommodation on central and peripheral axial lengths in young adult emmetropes and myopes. METHODS: On-axis and peripheral axial lengths were measured with the Haag-Streit Lenstar in 83 young adult participants for 0D and 6D accommodation demands. A Badal system was used to both correct refractive errors and induce accommodation. Participants were emmetropes (n = 29, mean spherical equivalent refraction +0.35 ± 0.35D), low myopes (32, -1...
December 23, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28027273/oxygen-tension-beneath-scleral-lenses-of-different-clearances
#8
Claude J Giasson, Jeanne Morency, Marc Melillo, Langis Michaud
PURPOSE: To evaluate the relative partial pressure in oxygen (pO2) at the corneal surface under Boston XO2 scleral lenses (SL) fitted with targeted clearances of 200 and 400 μm (SL200 and SL400). METHODS: During this prospective study, the right eyes of eight normal subjects were fitted with SL200 and SL400. Clearance, validated after 5 minutes of wear with an optical coherence tomograph, was used with lens thicknesses to calculate transmissibility and estimate pO2...
December 23, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28009794/ocular-straylight-with-different-multifocal-contact-lenses
#9
Grzegorz Łabuz, Norberto López-Gil, Thomas J T P van den Berg, Fernando Vargas-Martín
PURPOSE: Multifocal contact lenses have been growing in popularity as a modality to correct presbyopic eyes, although visual side effects such as disability glare have been reported. The objective of this study was to investigate the effect of multifocal contact lenses on disability glare by means of ocular straylight. METHODS: A prospective randomized, comparative study was performed that included 16 subjects free of ocular pathology. Straylight was measured using a commercial straylight meter with the natural and dilated pupil...
December 22, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28009793/measurement-duration-and-frequency-impact-objective-light-exposure-measures
#10
Sekar Ulaganathan, Scott A Read, Michael J Collins, Stephen J Vincent
PURPOSE: To determine the measurement duration and frequency required to reliably quantify the typical personal light exposure patterns of children and young adults. METHODS: Ambient light exposure data were obtained from 31 young adults and 30 children using a wrist-worn light sensor configured to measure ambient light exposure every 30 seconds for 14 days. To examine the influence of measurement duration upon light exposure, the daily time exposed to outdoor light levels (>1000 lux) was initially calculated based upon data from all 14 days and then recalculated from 12, 10, 8, 6, 4, and 2 randomly selected days...
December 22, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28009792/clinical-features-in-children-with-posterior-polymorphous-corneal-dystrophy
#11
Ye Jin Ahn, Soon Il Choi, Hae Ri Yum, Sun Young Shin, Shin Hae Park
PURPOSE: To describe clinical features in children diagnosed with posterior polymorphous corneal dystrophy (PPCD) in their first or second decade of life. METHODS: A retrospective study was performed with the medical records of seven unrelated Korean pediatric patients who were diagnosed with PPCD and were followed up for a minimum of 3 years. Thorough ocular examinations were performed, including best-corrected visual acuity, intraocular pressure, refractive and keratometric measurements, slit-lamp biomicroscopy, and specular microscopy at all visits...
December 22, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28005683/association-of-body-length-with-ocular-parameters-in-mice
#12
Ranjay Chakraborty, Han Na Park, Christopher C Tan, Paul Weiss, Megan C Prunty, Machelle T Pardue
PURPOSE: To determine the association between changes in body length with ocular refraction, corneal radii, axial length, and lens thickness in two different mouse strains. METHODS: Body length, ocular refraction, corneal radii, axial length, and lens thickness were measured for two inbred mouse strains: 129S1/SvJ (n = 7) and C57BL/6 J (n = 10) from 4 to 12 weeks of age. Body length, from tip of nose to base of tail, was obtained using a digital camera. Biometric parameters, corneal radii, and refractions were measured using spectral-domain optical coherence tomography, automated keratometry, and infrared photorefraction, respectively...
December 21, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28002097/associations-between-spatial-and-temporal-contrast-sensitivity-and-reading
#13
Tamara Brussee, Thomas J T P van den Berg, Ruth M A van Nispen, Ger H M B van Rens
PURPOSE: To gain insight into the association between optical and neural components of contrast sensitivity (CS), operationalized as spatial CS (optical and neural) or temporal CS (solely neural), and reading speed in a clinical sample of healthy adults of various ages. Furthermore, precision and agreement of the two methods were assessed. METHODS: The Mars test and the temporal CS implementation of the C-Quant device were used to measure spatial CS and temporal CS, respectively...
December 20, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27984506/sd-oct-and-adaptive-optics-imaging-of-outer-retinal-tubulation
#14
Brett J King, Kaitlyn A Sapoznik, Ann E Elsner, Thomas J Gast, Joel A Papay, Christopher A Clark, Stephen A Burns
PURPOSE: To investigate outer retinal tubulation (ORT) using spectral domain optical coherence tomography (SD-OCT) and an adaptive optics scanning laser ophthalmoscope (AOSLO). To document the frequency of ORT in atrophic retinal conditions and quantify ORT dimensions versus adjacent retinal layers. METHODS: SD-OCT images were reviewed for the presence of retinal atrophy, scarring, and/or exudation. The greatest width of each ORT was quantified. Inner and outer retinal thicknesses adjacent to and within the area of ORT were measured for 18 patients...
December 15, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27984505/relationship-between-corneal-thickness-and-radius-to-body-height
#15
Sven Jonuscheit, Michael J Doughty, Raúl Martín, Ana Rio-Cristobal
PURPOSE: To investigate the possible association between body stature (height) and corneal thickness and radius in younger-adult Caucasians, especially within the context of previously published literature. METHODS: Body height and weight were measured in 109 healthy subjects, with an average age of 24 ± 6 years (mean ± SD). Subjects underwent an ophthalmic assessment including anterior segment imaging by Scheimpflug topography and specular microscopy. Central and peripheral corneal thickness and corneal radius were analyzed...
December 15, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27922924/fixation-stability-recording-how-long-for-eyes-with-central-vision-loss
#16
Luminita Tarita-Nistor, Ishrat Gill, Esther G González, Martin J Steinbach
PURPOSE: Fixation examination with the MP-1 microperimeter (Nidek Technologies Srl., Vigonza, PD, Italy) determines the preferred retinal loci and fixation stability in patients with central vision loss. It is typically done for periods of 15 to 30 s as per the manual's recommendations, which are arbitrary. In this study, we examined (1) whether fixation stability depends on the duration of recording and (2) whether fixation stability changes over time. METHODS: Raw eye-position data from 76 patients with bilateral central vision loss (mean age = 80 ± 9...
December 5, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27918396/personalized-progressive-addition-lenses-correlation-between-performance-and-design
#17
Johanne Forkel, Jenny Lorén Reiniger, Adam Muschielok, Andrea Welk, Anne Seidemann, Peter Baumbach
PURPOSE: A continuous set of personalized designs (design space) for progressive addition lenses (PALs) is investigated. The main goals are (1) to study how the subjects' perception of a personalized design depends on its position in the design space and (2) to compare the performance of personalized PALs to a conventional PAL with a fixed design. METHODS: In a double-blind study, 51 subjects compared Rodenstock Impression FreeSign 3, which is a family of PALs with a continuously controllable personalized design, and Rodenstock Progressiv Life Free, which is a conventional PAL with a single fixed design...
December 1, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27906862/correlational-study-of-diabetic-retinopathy-and-hearing-loss
#18
Caroline Ooley, Weon Jun, Kim Le, Allen Kim, Nathan Rock, Molly Cardenal, Rebecca Kline, Drew Aldrich, John Hayes
PURPOSE: Our research goal was to complete a retrospective chart review to determine if there is a correlation between the level of diabetic retinopathy and diabetic neurosensory hearing loss. METHODS: A retrospective analysis of 175 Department of Veterans Affairs Computerized Patient Record System charts was completed at the VA Portland Health Care System. Subjects were classified by degree of diabetic retinopathy as follows: no diabetic retinopathy (n = 80), mild nonproliferative diabetic retinopathy (n = 51), moderate nonproliferative diabetic retinopathy (n = 25), and combined severe nonproliferative diabetic retinopathy and proliferative diabetic retinopathy (PDR) (n = 17)...
November 30, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27879499/impact-of-spherical-aberration-terms-on-multifocal-contact-lens-performance
#19
Cathleen Fedtke, Jennifer Sha, Varghese Thomas, Klaus Ehrmann, Ravi C Bakaraju
PURPOSE: To investigate the impact of the primary (PSA) and secondary (SSA) spherical aberration terms on visual performance (VP) in presbyopes, as measured using multifocal (MFCL) soft contact lenses on eye. METHODS: Seventeen presbyopes (age: 55.1 ± 6.9 years) wore seven commercial lenses (four center-near (MFCL N), one center-distance (MFCL D), one bifocal, and one single vision control). Unaided and with each lens on eye, the PSA and SSA terms were obtained with an aberrometer, the BHVI-EyeMapper (low illumination, natural and 4 mm pupil diameter)...
November 22, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27870779/painless-acanthamoeba-keratitis-with-normal-vision
#20
Pui Wai Rachel Kwok, Ka Wai Kam, Vishal Jhanji, Alvin L Young
PURPOSE: To report an atypical case of contact lens-related Acanthamoeba keratitis. CASE REPORT: A 15-year-old secondary school female student with a history of soft contact lens wear was referred to our hospital by a private general practitioner for management of right eye redness and discomfort for 2 weeks. Upon examination, the best-corrected visual acuity was 20/20 and 20/16 for her right and left eyes, respectively. There was diffuse radial keratoneuritis noted in the cornea of her right eye without any associated epithelial defect...
November 19, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
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