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https://www.readbyqxmd.com/read/28932335/cataract-surgery-in-patients-with-keratoconus-pearls-and-pitfalls
#1
F Aiello, Q J Nasser, C Nucci, R I Angunawela, Z Gatzioufas, V Maurino
BACKGROUND: Keratoconus (KC) is a common ectatic disorder resulting in progressive corneal thinning and irregular astigmatism. It has been observed that patients affected by KC are more likely to develop lens opacities earlier compared to non-keratoconic patients. OBJECTIVE: Intraocular lens (IOL) selection and refractive outcome prediction are among a number of factors that can make cataract surgery in keratoconic patients challenging. Accurate biometry is often difficult to obtain due to unreliable K measurements and lack of dedicated biometric formulae...
2017: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/28917399/variability-in-angle-%C3%AE%C2%BA-and-its-influence-on%C3%A2-higher-order-aberrations-in%C3%A2-pseudophakic-eyes
#2
Annette Harrer, Nino Hirnschall, Juan Tabernero, Pablo Artal, Petra Draschl, Sophie Maedel, Oliver Findl
PURPOSE: To observe the variability in angle κ in pseudophakic patients and assess its correlation with optical biometry measurements and higher-order aberrations (HOAs). SETTING: Hanusch Hospital, Vienna, Austria. DESIGN: Prospective case series. METHODS: This study included patients who had cataract surgery 3 months to 1 year before study recruitment. In all cases, Purkinje meter images were taken. In addition, partial coherence interferometry measurement (IOLMaster) of the axial intraocular lens (IOL) position was performed...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28905823/refractive-outcomes-of-intraoperative-wavefront-aberrometry-versus-optical-biometry-alone-for-intraocular-lens-power-calculation
#3
Zina Zhang, Logan William Thomas, Szu-Yen Leu, Steven Carter, Sumit Garg
PURPOSE: To compare the outcomes of intraoperative wavefront aberrometry versus optical biometry alone for intraocular lens (IOL) power calculation in eyes undergoing cataract surgery with monofocal IOL implantation. METHODS: Preoperative data were obtained with the IOLMaster. Intraoperative aphakic measurements and IOL power calculations were obtained in some patients with the optiwave refractive analysis (ORA) system. Analysis was performed to determine the accuracy of monofocal IOL power prediction and postoperative manifest refraction at 1 month of the ORA versus IOLMaster...
September 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28900109/region-specific-differential-corneal-and-scleral-mrna-expressions-of-mmp2-timp2-and-tgfb2-in-highly-myopic-astigmatic-chicks
#4
Lisa Yan-Yan Xi, Shea Ping Yip, Sze Wan Shan, Jody Summers-Rada, Chea-Su Kee
Myopia and astigmatism, two common refractive errors frequently co-exist, are affecting vision at all working distances in the affected populations worldwide. Eyeballs having these refractive errors are known to exhibit abnormal eye shape at the anterior and posterior eye segments, but whether the outer coats of these abnormal eyeballs, cornea anteriorly and sclera posteriorly, are regulated by region-specific molecular mechanism remains unclear. Here we presented the changes in mRNA expression levels of three genes (MMP2, TIMP2, and TGFB2), all known to participate in extracellular matrix organization, at five regions of the cornea and sclera in chickens developing high myopia and astigmatism induced by form deprivation...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28891727/methodology-of-the-zoc-bhvi-high-myopia-cohort-study-the-onset-and-progression-of-myopic-pathologies-and-associated-risk-factors-in-highly-myopic-chinese
#5
Yanxian Chen, Ou Xiao, Xinxing Guo, Decai Wang, Padmaja Sankaridurg, Ian Morgan, Mingguang He
PURPOSE: The increasing prevalence of high myopia and its associated pathologies has raised challenges to ophthalmic services. This project aims to explore the onset and progression of myopic pathologies in highly myopic eyes through a prospective research cohort established in South China. METHODS: Patients with high myopia (sphere ≤ -6.00 D) visiting the optometric clinic of Zhongshan Ophthalmic Center (ZOC) were invited to participate in the baseline examinations and follow-up visit over a 10-year period...
September 11, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28887137/effects-of-a-high-level-of-illumination-before-sleep-at-night-on-chorioretinal-thickness-and-ocular-biometry
#6
Jaemoon Ahn, Soh-Eun Ahn, Kyung-Sook Yang, Seong-Woo Kim, Jaeryung Oh
The choroid is affected by many factors. One of the factors, change in illumination has been suggested to influence choroidal thickness. However, the effects of bright light before sleep at night on the human eye are not well established. The purpose of this study was to investigate the effects of a high level of illumination in the evening on ocular measurements. Twenty-seven men with myopia spent seven consecutive nights in the sleep laboratory. During the first two nights, subjects were exposed to light at 150 lux between 20:00 and midnight...
September 5, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28858045/corneal-hysteresis-is-reduced-in-obstructive-sleep-apnea-syndrome
#7
Suchitra Nadarajah, Amir Samsudin, Norlina Ramli, Chong Tin Tan, Zahari Mimiwati
SIGNIFICANCE: To our knowledge, this is the first time a study looking at the association between corneal hysteresis (CH) and obstructive sleep apnea syndrome (OSAS) severity has been reported. We provide evidence that CH is lower in OSAS and speculate on the possible causes. PURPOSE: The present study aims to look at the association between CH and severity of OSAS, and whether CH could be another link between OSAS and the development of glaucoma. METHODS: This was a cross-sectional, observational study at the University Malaya Medical Centre, Kuala Lumpur...
August 25, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28855546/the-effect-of-topical-administration-of-cyclopentolate-on-ocular-biometry-an-analysis-for-mouse-and-human-models
#8
Furong Huang, Shenghai Huang, Ruozhong Xie, Yanan Yang, Jiaofeng Yan, Xiaowen Cao, Chunlan Zhang, Feng Zhou, Meixiao Shen, Jia Qu, Xiangtian Zhou
Mydriasis with muscarinic antagonists have been used routinely prior to retinal examination and sometimes prior to refractive measurements of the mouse eye. However, biometric changes during topical administration of muscarinic antagonists have not been fully investigated in mice and humans. We found that the mouse eyes treated with cyclopentolate developed a hyperopia with a reduction in both the vitreous chamber depth and axial length. In humans, prior to the cyclopentolate treatment, a 6D accommodative stimulus produced a myopic shift with a reduced anterior chamber depth, choroidal thickness and anterior lens radius of curvature and an increase in lens thickness...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28834818/agreement-of-corneal-diameter-measurements-obtained-by-a-swept-source-biometer-and-a-scheimpflug-based-topographer
#9
Ramin Salouti, Mohammad Hossein Nowroozzadeh, Zahra Tajbakhsh, Mansoureh Bagheri, Maryam Ghoreyshi, Monir Azizzadeh, Mohammad Reza Razeghinejad
PURPOSE: To assess the agreement between a swept-source optical biometry device (IOLMaster 700) and a Scheimpflug-based topography device (Pentacam HR) in measuring the corneal diameter. METHODS: A total of 100 eyes from 100 cataract surgery candidates were enrolled. The white-to-white (WTW) distance measurements provided by both devices were recorded and analyzed. A paired t test was performed to compare the mean values of the WTW distance between the IOLMaster 700 and Pentacam HR...
August 22, 2017: Cornea
https://www.readbyqxmd.com/read/28808644/the-comparative-study-of-refractive-index-variations-between-haigis-srk-t-and-hoffer-q-formulas-used-for-preoperative-biometry-calculation-in-patients-with-the-axial-length-25-mm
#10
Hasan Razmjoo, Hosein Atarzadeh, Neda Kargar, Mohammad Behfarnia, Kobra Nasrollahi, Ali Kamali
BACKGROUND: To compare refractive index variation between Hoffer-Q, Haigis and SRK/T formulas used for preoperative biometry calculation in patients with axial length >25 mm, undergoing cataract surgery. MATERIALS AND METHODS: This is a randomized clinical trial study was performed on 54 eyes of 54 patients with ages of 40-70 years old and axial length >25 mm classified into three groups that their IOL POWER were calculated by Haigis, SRK/T and Hoffer-Q formulas before undergoing cataract surgery...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28778114/comparison-of-hill-radial-basis-function-barrett-universal-and-current-third-generation-formulas-for-the-calculation-of-intraocular-lens-power-during-cataract-surgery
#11
Timothy V Roberts, Chris Hodge, Gerard Sutton, Michael Lawless
IMPORTANCE: This study represents a novel comparison of recently introduced intraocular lens power calculation formulas. BACKGROUND: To compare current new generation formulas for calculating the intraocular lens power for a standard cohort of patients undergoing cataract and lens replacement surgery in a private group practice in Australia. DESIGN: Retrospective case series comparison. PARTICIPANTS: Postoperative results from 400 consecutive patients undergoing implantation of an SN60WF intraocular lens post cataract removal by 12 surgeons were used...
August 4, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28777384/changes-in-anterior-ocular-structures-and-macula-following-deep-sclerectomy-with-collagen-implant
#12
Sakari M A Suominen, Mika P Harju, Asta M E Hautamäki, Eija T Vesti
PURPOSE: To determine the effect of intraocular pressure (IOP) lowering with deep sclerectomy (DS) on visual acuity, macular structures, and anterior ocular dimensions during the early postoperative period. METHODS: We prospectively analyzed 35 eyes of 35 patients scheduled for DS. Our focus with the measurements was on early postoperative changes in anterior ocular and macular structures related to IOP lowering during the first month after DS. In addition to a clinical ophthalmologic examination, our measurements included corneal topography, measurement of ocular dimensions with optical biometry, and examination of macular structure with optical coherence tomography...
August 2, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28776594/the-inner-retinal-structures-of-the-eyes-of-children-with-a-history-of-retinopathy-of-prematurity
#13
Y-S Lee, S H L Chang, S-C Wu, L-C See, S-H Chang, M-L Yang, W-C Wu
PurposeTo investigate the microstructural differences of the inner retina in the peripapillary and macular areas in children with or without retinopathy of prematurity (ROP).MethodsThis prospective cohort study included school-age children with a history of ROP and age-matched healthy, full-term children. The macular ganglion cell complex (mGCC), peripapillary retinal nerve fiber layer (RNFL), refractive status, and ocular biometry were measured. The metrics of the mGCC and associated anatomical changes were the primary outcomes...
August 4, 2017: Eye
https://www.readbyqxmd.com/read/28732610/intraocular-pressure-change-after-phacoemulsification-in-angle-closure-eyes-without-medical-therapy
#14
Eray Atalay, Monisha E Nongpiur, Mani Baskaran, Shamira A Perera, Tina T Wong, Desmond Quek, Tin Aung
PURPOSE: To evaluate the intraocular pressure (IOP) change and associated factors 6 months after phacoemulsification in eyes with primary angle-closure suspect (PACS) and eyes with primary angle closure (PAC) that had no medical therapy. SETTING: Singapore National Eye Center, Singapore, Singapore. DESIGN: Retrospective case series. METHODS: Patients with PACS or PAC (with corrected distance visual acuity <20/40) who had uneventful phacoemulsification were recruited...
June 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28731878/correlation-of-corneal-biomechanical-stiffness-with-refractive-error-and-ocular-biometry-in-a-pediatric-population
#15
Jyoti Matalia, Mathew Francis, Pooja Gogri, Pratibha Panmand, Himanshu Matalia, Abhijit Sinha Roy
PURPOSE: To assess the correlation between corneal biomechanical stiffness and refractive error (RE) in the pediatric population. METHODS: A total of 733 pediatric eyes were included in the study retrospectively. All eyes underwent corneal tomography (Pentacam), RE assessment, and air-puff deformation (Corvis-ST). Waveform analyses of deformation provided corneal stiffness (CS) and extraocular tissue stiffness (EOS). Eyes were subgrouped into emmetropia [manifest refraction spherical equivalent (MRSE) ∼ 0 D], hyperopia (MRSE > 0 D), myopia I (MRSE between 0 D and -3 D), myopia II (MRSE between -3 D and -6 D), and myopia III (MRSE greater than -6 D) for multivariate analyses...
October 2017: Cornea
https://www.readbyqxmd.com/read/28712891/corneo-scleral-contact-lenses-in-an-uncommon-case-of-keratoconus-with-high-hyperopia-and-astigmatism
#16
Esteban Porcar, Juan Carlos Montalt, Enrique España-Gregori, Cristina Peris-Martínez
PURPOSE: To analyse the visual quality achieved by fitting corneo-scleral contact lenses (CScL) in an uncommon case of bilateral keratoconus, high hyperopia and astigmatism. METHODS: A 45-year-old man presented for eye examination due to the unsatisfactory quality of his vision wearing soft toric contact lenses. He presented high hyperopia and astigmatism with bilateral keratoconus. He was fitted with CScL to correct his irregular astigmatism and ocular aberrations...
October 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28711218/significant-axial-elongation-with-minimal-change-in-refraction-in-3-to-6-year-old-chinese-preschoolers-the-shenzhen-kindergarten-eye-study
#17
Xinxing Guo, Min Fu, Xiaohu Ding, Ian G Morgan, Yangfa Zeng, Mingguang He
PURPOSE: To document the distribution of ocular biometry and to evaluate its associations with refraction in a group of Chinese preschoolers. DESIGN: Population-based cross-sectional study. PARTICIPANTS: A total of 1133 preschoolers 3 to 6 years of age from 8 representative kindergartens. METHODS: Biometric measurements including axial length (AL), anterior chamber depth (ACD), and corneal radius of curvature (CR) were obtained from partial-coherence laser interferometry (IOL Master; Carl Zeiss Meditec, Oberkochen, Germany) before cycloplegia...
July 13, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28681907/corneal-asphericity-and-iol-power-calculation-in-eyes-with-aspherical-iols
#18
Giacomo Savini, Kenneth J Hoffer, Piero Barboni, Domenico Schiano Lomoriello, Pietro Ducoli
PURPOSE: Given that a previous study found that corneal asphericity influences the refractive outcome of intraocular lens (IOL) power calculation by means of thin-lens formulas in eyes with spherical IOLs, the authors aimed to verify whether such influence can also be observed in eyes with aspherical IOLs. METHODS: In this retrospective comparative case series, IOL power was calculated with the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas in two groups of eyes undergoing phacoemulsification and implantation of an aspherical IOL (Acrysof SN60WF; Alcon Laboratories, Inc...
July 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28671340/physical-activity-and-myopia-in-danish-children-the-champs-eye-study
#19
Kristian Lundberg, Anne Suhr Thykjaer, Rasmus Søgaard Hansen, Anders Højslet Vestergaard, Nina Jacobsen, Ernst Goldschmidt, Rodrigo Antunes Lima, Tunde Peto, Niels Wedderkopp, Jakob Grauslund
PURPOSE: To determine associations between physical activity (PA) and myopia in Danish school children and investigate the prevalence of myopia. METHODS: This is a prospective study with longitudinal data on PA in a Danish child cohort. Physical activity (PA) was measured objectively by repeated ActiGraph accelerometer measurement four times with different intervals (1-2.5 years) at the mean ages 9.7, 11.0, 12.9 and 15.4 years. Mean intensity of PA was estimated as counts/minutes, and time spent in sedentary, light, moderate and vigorous PA was summed using defined cut-off points...
July 3, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28670106/predicting-the-refractive-outcome-and-accuracy-of-iol-power-calculation-after-phacoemulsification-using-the-srk-t-formula-with-ultrasound-biometry-in-medium-axial-lengths
#20
Yunus Karabela, Mustafa Eliacik, Mehmet Selim Kocabora, Sevil Karaman Erdur, Hakan Baybora
PURPOSE: To evaluate the accuracy of the SRK/T formula using ultrasound (US) biometry in predicting a target postoperative refraction of ±1.00D in eyes with medium axial length (AL) that underwent phacoemulsification. METHODS: The present study was a retrospective analysis, which included 538 eyes with an AL from 22.0 to 24.60 mm that underwent phacoemulsification and foldable intraocular lens (IOL) implantation (six different IOLs) in the bag. Preoperative AL was measured by US biometry and IOL power (IOLp) was calculated with the SRK/T formula...
2017: Clinical Ophthalmology
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