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https://www.readbyqxmd.com/read/28333895/visual-field-defects-in-young-patients-with-open-angle-glaucoma-comparison-between-high-tension-and-normal-tension-glaucoma
#1
Ji-Hye Park, Chungkwon Yoo, Jinhwan Park, Yong Yeon Kim
PURPOSE: To investigate the clinical features of young Korean patients with open-angle glaucoma (OAG), and to compare visual field (VF) defects between patients with normal-tension glaucoma (NTG) and those with high-tension glaucoma (HTG). MATERIALS AND METHODS: Patients with OAG younger than 40 years of age were divided into NTG and HTG groups based on untreated intraocular pressure (IOP) level. The patients were matched according to the mean deviation of standard automated perimetry...
March 22, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28332896/the-distribution-of-macular-thickness-and-its-determinants-in-a-healthy-population
#2
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/28326601/quantitative-analysis-of-eyes-and-other-optical-systems-in-linear-optics
#3
William F Harris, Tanya Evans, Radboud D van Gool
PURPOSE: To show that 14-dimensional spaces of augmented point P and angle Q characteristics, matrices obtained from the ray transference, are suitable for quantitative analysis although only the latter define an inner-product space and only on it can one define distances and angles. The paper examines the nature of the spaces and their relationships to other spaces including symmetric dioptric power space. METHODS: The paper makes use of linear optics, a three-dimensional generalization of Gaussian optics...
March 21, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28317667/small-incision-lenticule-extraction-in-a-patient-with-congenital-nystagmus
#4
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/28317664/posterior-chamber-phakic-intraocular-lenses-to-improve-visual-outcomes-in-keratoconus-patients
#5
REVIEW
José Juan Esteve-Taboada, Alberto Domínguez-Vicent, Teresa Ferrer-Blasco, José F Alfonso, Robert Montés-Micó
The aim of this review is to summarize the results of using posterior chamber phakic intraocular lenses (pIOLs) to restore quality of vision in keratoconus patients. These pIOLs can correct the refractive errors associated with keratoconus and can also be combined with other surgical techniques to improve the results.
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28301857/structural-and-functional-characterization-of-benign-fleck-retina-using-multimodal-imaging
#6
Srividya Neriyanuri, Chetan Rao, Rajiv Raman
PURPOSE: To report structural and functional features in a case series of benign fleck retina using multimodal imaging. METHODS: Four cases with benign fleck retina underwent complete ophthalmic examination that included detailed history, visual acuity, and refractive error testing, FM-100 hue test, dilated fundus evaluation, full field electroretinogram, fundus photography with autofluorescence, fundus fluorescein angiography, and swept-source optical coherence tomography...
April 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28301497/long-term-outcomes-of-ciliary-sulcus-versus-capsular-bag-fixation-of-intraocular-lenses-in-children-an-ultrasound-biomicroscopy-study
#7
Yun-E Zhao, Xian-Hui Gong, Xue-Ning Zhu, He-Ming Li, Meng-Jun Tu, Terry G Coursey, Stephen C Pflugfelder, Feng Gu, Ding Chen
PURPOSE: To evaluate the long-term outcomes of ciliary sulcus versus capsular bag fixation of intraocular lenses (IOLs) in children after pediatric cataract surgery. METHODS: IOL was implanted in the ciliary sulcus in 21 eyes of 14 children, and in the capsular bag in 19 eyes of 12 children for the treatment of pediatric cataract in an institutional setting. Ultrasound biomicroscopy (UBM) was performed. Main outcome measures included IOL decentration, IOL tilt, anterior chamber depth (ACD), angle-opening distance at 500 μm (AOD500), trabecular-iris angle (TIA), best-corrected visual acuity (BCVA), intraocular pressure (IOP), and incidence of postoperative complications...
2017: PloS One
https://www.readbyqxmd.com/read/28294406/does-transient-increase-in-axial-length-during-accommodation-attenuate-with-age
#8
Deborah S Laughton, Amy L Sheppard, Edward A H Mallen, Scott A Read, Leon N Davies
BACKGROUND: The aim was to profile transient accommodative axial length changes from early adulthood to advanced presbyopia and to determine whether any differences exist between the responses of myopic and emmetropic individuals. METHODS: Ocular biometry was measured by the LenStar biometer (Haag-Streit, Switzerland) in response to zero, 3.00 and 4.50 D accommodative stimuli in 35 emmetropes and 37 myopes, aged 18 to 60 years. All results were corrected to reduce errors arising from the increase in crystalline lens thickness with accommodation...
March 12, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28293434/visual-motor-and-perceptual-task-performance-in-astigmatic-students
#9
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/28291868/the-response-ac-a-ratio-before-and-after-the-onset-of-myopia
#10
Donald O Mutti, G Lynn Mitchell, Lisa A Jones-Jordan, Susan A Cotter, Robert N Kleinstein, Ruth E Manny, J Daniel Twelker, Karla Zadnik
Purpose: To investigate the ratio of accommodative convergence per diopter of accommodative response (AC/A ratio) before, during, and after myopia onset. Methods: Subjects were 698 children aged 6 to 14 years who became myopic and 430 emmetropic children participating in the Collaborative Longitudinal Evaluation of Ethnicity and Refractive Error. Refractive error was measured using cycloplegic autorefraction, near work by parent survey, and the AC/A ratio by simultaneously monitoring convergence and accommodative response...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28291195/-optic-nerve-pathology-in-the-structure-of-diagnostic-errors-inpatients-referred-for-cataract-surgery
#11
V V Egorov, N V Savchenko, E L Sorokin, O V Danilov
AIM: to study the frequency of misdiagnosis of cataract in patients with optic nerve pathology or amblyopia and to identify its main causes. MATERIAL AND METHODS: The study enrolled 381 patients (381 eyes) wrongly diagnosed with cataract. A standard set of eye tests was performed. In-depth examination of the macular area was done through biomicroscopy with contactless aspheric lenses of 60 and 90 D. Part of the patients underwent optical coherence tomography and static perimetry as well as examination of electrical sensitivity threshold and electrical lability of the optic nerve...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28288603/a-cute-angle-closure-attack-after-an-intravitreal-bevacizumab-injection-for-branch-retinal-vein-occlusion-a-case-report
#12
Seongyong Jeong, Min Sagong, Woohyok Chang
BACKGROUND: Intravitreal injection is widely used to treat retinal vein occlusion, and acute angle closure (AAC) is an exceptional complication of intravitreal injection. The authors report a case of AAC that occurred immediately after administering intravitreal bevacizumab to treat branch retinal vein occlusion (BRVO). CASE PRESENTATION: A 65-year-old woman was referred to the retina clinic of a tertiary referral center for the treatment of macular edema secondary to BRVO...
March 14, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28288016/variability-in-objective-refraction-for-persons-with-down-syndrome
#13
Jason D Marsack, Ayeswarya Ravikumar, Julia S Benoit, Heather A Anderson
PURPOSE: Down syndrome (DS) is associated with ocular and cognitive sequelae, which both have the potential to influence clinical measures of refractive error. This study compares variability of autorefraction among subjects with and without DS. METHODS: Grand Seiko autorefraction was performed on 139 subjects with DS (age: 8-55, mean: 25 ± 9 yrs) and 138 controls (age: 7-59, mean: 25 ± 10 yrs). Subjects with three refraction measures per eye (DS: 113, control: 136) were included for analysis...
March 11, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28282064/predicting-the-risk-of-parafoveal-scotoma-in-myopic-normal-tension-glaucoma-role-of-optic-disc-tilt-and-rotation
#14
M S Sung, H Heo, Y S Ji, S W Park
PurposeThe purpose of the study was to evaluate the factors associated with development of parafoveal scotoma in early myopic normal tension glaucoma (NTG).Patients and methodsNinety-nine myopic NTG patients with mean deviation (MD) >-6.0 decibels (dB) were enrolled. Parafoveal scotoma was defined as a visual field (VF) defect within 10° of fixation with at least one point at P<1% lying at the four innermost central points. Systemic factors, optic disc characteristics including tilt ratio, rotation degree, β-zone parapapillary atrophy, disc hemorrhage, and peripapillary retinal nerve fiber layer and macular ganglion cell-inner plexiform layer (mGCIPL) thickness parameters using optical coherence tomography were evaluated...
March 10, 2017: Eye
https://www.readbyqxmd.com/read/28282063/lower-urinary-cotinine-level-is-associated-with-a-trend-toward-more-myopic-refractive-errors-in-korean-adolescents
#15
G E Nam, B E Hwang, Y-C Lee, J-S Paik, S-W Yang, Y-H Chun, K Han, Y G Park, S H Park
PurposeTo investigate the association between urinary cotinine levels as an objective biological marker for exposure to nicotine and refractive status.Patients and methodsThis cross-sectional study analyzed data from the Korea National Health and Nutrition Examination Survey between 2008 and 2011. A total of 1139 Korean adolescents aged 12-18 years were enrolled. Urinary cotinine concentrations and other potential risk factors for myopia were examined. Correlation analyses and multivariate regression analysis were performed to investigate the association between urinary cotinine level and refractive error...
March 10, 2017: Eye
https://www.readbyqxmd.com/read/28273986/a-comparative-study-to-assess-the-predictability-of-different-iol-power-calculation-formulas-in-eyes-of-short-and-long-axial-length
#16
Dharmil Doshi, Purvi Limdi, Nilesh Parekh, Neepa Gohil
INTRODUCTION: Accurate Intraocular Lens (IOL) power calculation in cataract surgery is very important for providing postoperative precise vision. Selection of most appropriate formula is difficult in high myopic and hypermetropic patients. AIM: To investigate the predictability of different IOL (Intra Ocular Lens) power calculation formulae in eyes with short and long Axial Length (AL) and to find out most accurate IOL power calculation formula in both groups. MATERIALS AND METHODS: A prospective study was conducted on 80 consecutive patients who underwent phacoemulsification with monofocal IOL implantation after obtaining an informed and written consent...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28273153/prevalence-and-association-of-refractive-anisometropia-with-near-work-habits-among-young-schoolchildren-the-evidence-from-a-population-based-study
#17
Chia-Wei Lee, Shao-You Fang, Der-Chong Tsai, Nicole Huang, Chih-Chien Hsu, Shing-Yi Chen, Allen Wen-Hsiang Chiu, Catherine Jui-Ling Liu
BACKGROUND: Lifestyle behaviour may play a role in refractive error among children, but the association between near work habits and refractive anisometropia remains unclear. METHODS: We estimated the prevalence of refractive anisometropia and examined its association with near work activities among 23,114 children in the Myopia Investigation Study in Taipei who were grade 2 elementary school students at baseline in 2013 and 2014. Baseline data on demographics, medical history, parental history and near work habits were collected by parent-administered questionnaire survey...
2017: PloS One
https://www.readbyqxmd.com/read/28270978/optics-of-the-human-cornea-influence-the-accuracy-of-stereo-eye-tracking-methods-a-simulation-study
#18
A D Barsingerhorn, F N Boonstra, H H L M Goossens
Current stereo eye-tracking methods model the cornea as a sphere with one refractive surface. However, the human cornea is slightly aspheric and has two refractive surfaces. Here we used ray-tracing and the Navarro eye-model to study how these optical properties affect the accuracy of different stereo eye-tracking methods. We found that pupil size, gaze direction and head position all influence the reconstruction of gaze. Resulting errors range between ± 1.0 degrees at best. This shows that stereo eye-tracking may be an option if reliable calibration is not possible, but the applied eye-model should account for the actual optics of the cornea...
February 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28266057/effect-of-axial-length-on-full-field-and-multifocal-electroretinograms
#19
Ramya Sachidanandam, Priya Ravi, Parveen Sen
PURPOSE: The aim was to investigate the effect of axial length on full-field electroretinogram (ffERG) and multifocal electroretinogram (mfERG) in young Indian subjects. METHODS: One hundred subjects (44 male) with refractive errors from +0.50 to -18.00 DS and no myopic retinopathy underwent axial length measurement. ffERG was measured, which included scotopic and photopic responses according to International Society for Clinical Electrophysiology of Vision (ISCEV) guidelines...
March 7, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28264132/influences-of-flap-shape-and-hinge-angle-on-opaque-bubble-layer-formation-in-femtosecond-laser-assisted-lasik-surgery
#20
Hung-Yuan Lin, Yi-Ting Fang, Ya-Jung Chuang, Han-Chieh Yu, Christy Pu, Yiing-Jenq Chou, Chih-Yi Chien, Pi-Jung Lin, Steven C Schallhorn, Chi-Chin Sun
PURPOSE: To evaluate the effects of different flap shapes and hinge angles on opaque bubble layer (OBL) formation using a femtosecond laser for flap creation in LASIK surgery. METHODS: This retrospective study evaluated 138 eyes of 73 patients who underwent femtosecond laser-assisted LASIK with a 150-kHz IntraLase femtosecond laser (Abbott Medical Optics, Inc., Santa Ana, CA) for myopic astigmatism and compared differences between different flap shapes and hinge angles on OBL formation...
March 1, 2017: Journal of Refractive Surgery
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