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https://www.readbyqxmd.com/read/27898448/laser-vision-correction-in-treating-myopia
#1
Germano Leal Ehlke, Ronald R Krueger
Myopia is a generally benign refractive error with an increasing prevalence worldwide. It can be corrected temporarily with glasses and contact lenses and permanently with laser vision correction. The 2 main procedures currently being performed for myopia correction are photorefractive keratectomy and laser-assisted in situ keratomileusis. Each technique has its advantages, but they appear to yield similar visual outcomes 1 year after surgery. Laser vision correction for myopia was considered a paradigm shift because healthy eyes could now undergo a surgical procedure to permanently and safely correct the error by altering the center of the cornea, which was previously off limits because of the potential for loss of transparency...
November 2016: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/27895981/perceived-image-quality-with-simulated-segmented-bifocal-corrections
#2
Carlos Dorronsoro, Aiswaryah Radhakrishnan, Pablo de Gracia, Lucie Sawides, Susana Marcos
Bifocal contact or intraocular lenses use the principle of simultaneous vision to correct for presbyopia. A modified two-channel simultaneous vision simulator provided with an amplitude transmission spatial light modulator was used to optically simulate 14 segmented bifocal patterns (+ 3 diopters addition) with different far/near pupillary distributions of equal energy. Five subjects with paralyzed accommodation evaluated image quality and subjective preference through the segmented bifocal corrections. There are strong and systematic perceptual differences across the patterns, subjects and observation distances: 48% of the conditions evaluated were significantly preferred or rejected...
November 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27843230/preclinical-cataract-masquerading-as-post-lasik-regression
#3
Rohit Shetty, Nikhil Negalur, Mathew Kurian, Rushad Shroff
The purpose of this case report is to bring forth a rare clinical scenario where preclinical cataract mimics post-LASIK regression and to describe the role of aberrometry in detecting higher order aberrations (HOAs) and early lens changes. A 36-year-old female presented with blurring of vision since 1 year after having undergone an uneventful LASIK surgery 3 years prior. Corneal topography and aberrometry were within normal limits. Although the lens was morphologically normal on slit lamp examination, increased HOAs and lenticular density were detected...
September 2016: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/27830203/corneal-aberration-changes-after-rigid-gas-permeable-contact-lens-wear-in-keratokonic-patients
#4
Fereshteh Shokrollahzadeh, Hassan Hashemi, Ebrahim Jafarzadehpur, Ali Mirzajani, Mehdi Khabazkhoob, Abbasali Yekta, Soheila Asgari
PURPOSE: To determine the short-term effect of rigid gas permeable (RGP) contact lenses on corneal aberrations in keratoconic patients. METHOD: Sixteen keratoconic eyes with no history of RGP lens wear were included. They all had corneal aberrometry using Pentacam, and different aberration indices of the anterior and posterior surfaces of the cornea were measured before and 3 months after fitting RGP lenses. The effect of baseline parameters on these changes was tested in univariate and multiple models...
December 2016: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/27791246/corneal-higher-order-aberrations-after-phacoemulsification-a-comparison-of-3-different-incision-sizes
#5
Christoph von Sonnleithner, Daniel Pilger, David Homburg, Tobias Brockmann, Necip Torun, Eckart Bertelmann
PURPOSE: To analyze the impact of different incision sizes for phacoemulsification on corneal higher-order aberrations (HOA). METHODS: Patients seeking cataract surgery were randomly assigned to one of the following groups: 1.4 mm with biaxial microincision phacoemulsification (25 eyes), 1.8 mm with coaxial phacoemulsification (27 eyes), and 2.2 mm with coaxial phacoemulsification (62 eyes). Inclusion criteria were a minimum age of 18 years and uncomplicated cataract...
October 27, 2016: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/27785598/pseudo-accommodation-in-non-amblyopic-children-after-bilateral-cataract-surgery-and-implantation-with-a-monofocal-intraocular-lens-prevalence-and-possible-mechanisms
#6
Charlotte Dénier, Pascal Dureau, Catherine Edelson, Amandine Barjol, Georges Caputo
BACKGROUND: Some pseudophakic patients implanted with a monofocal intraocular lens (IOL) have good near visual acuity (VA) with their distance correction. The objective was to evaluate the prevalence of pseudo-accommodation in children after bilateral cataract surgery, without amblyopia, and to define its mechanisms. METHODS: Observational study that took place in a pediatric ophthalmology department, Paris, France. A total of 68 eyes were included, 40 from 23 children and 28 from 14 adults, with a corrected distance VA above 20/25 and a normal near VA (20/25) with +3 addition...
October 26, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27722754/transepithelial-iontophoresis-versus-standard-corneal-collagen-cross-linking-1-year-results-of-a-prospective-clinical-study
#7
Paolo Vinciguerra, Vito Romano, Pietro Rosetta, Emanuela F Legrottaglie, Raffaele Piscopo, Claudia Fabiani, Claudio Azzolini, Riccardo Vinciguerra
PURPOSE: To compare 1-year transepithelial corneal collagen cross-linking with iontophoresis (I-CXL) outcomes with standard CXL (S-CXL) epithelium-off for progressive keratoconus. METHODS: Forty eyes of 40 patients with progressive keratoconus were included in this comparative, prospective clinical study. Corrected distance visual acuity (CDVA), spherical equivalent, cylinder refraction, corneal topography, Scheimpflug tomography, aberrometry, and endothelial cell count were assessed at baseline and at 1, 3, 6, and 12 months of follow-up...
October 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27579454/correlation-of-higher-order-aberrations-and-components-of-astigmatism-in-myopic-refractive-surgery-candidates
#8
Mehrdad Mohammadpour, Zahra Heidari, Hossein Mohammad-Rabei, Ebrahim Jafarzadehpur, Mahmoud Jabbarvand, Hassan Hashemi, Mehdi Khabazkhoob
PURPOSE: To evaluate the correlation between refractive, corneal, and residual astigmatism and higher order aberrations (HOA) in refractive surgery candidates. METHODS: Three hundred and seventy-five eyes of 188 patients aged 28.2 ± 6.24 years with a predominance of females (62.7%) were enrolled in this study. Refraction, topography (Orbscan IIz, Bausch & Lomb, Rochester, NY, USA), and aberrometry (Zywave, Bausch & Lomb, Rochester, NY, USA) were performed to determine refractive and corneal astigmatism and HOA for all participants...
September 2016: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/27547758/iontophoresis-assisted-corneal-collagen-cross-linking-with-epithelial-debridement-preliminary-results
#9
Paolo Vinciguerra, Vito Romano, Pietro Rosetta, Emanuela F Legrottaglie, Magdalena Kubrak-Kisza, Claudio Azzolini, Riccardo Vinciguerra
Purpose. To report the early outcomes of iontophoresis-assisted corneal collagen cross-linking procedure with epithelial debridement (I-SCXL). Methods. Twenty eyes of twenty patients with progressive keratoconus were included in this prospective clinical study. Best spectacle corrected visual acuity (BSCVA), sphere and cylinder refraction, corneal topography, Scheimpflug tomography, aberrometry, anterior segment optical coherence tomography (AS-OCT), and endothelial cell count were assessed at baseline and at 1, 3, and 6 months of follow-up...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27496244/eccentric-small-zone-ray-tracing-wavefront-aberrometry-for-refraction-in-keratoconus
#10
Anneli Fredriksson, Anders Behndig
PURPOSE: To compare objective refraction using small-zone eccentric laser ray tracing (LRT) wavefront aberrometry to standard autorefraction in keratoconus (KC), and whether the visual acuities achieved with these refractions differ from corresponding values in healthy eyes. METHODS: Twenty-nine eyes of 29 patients with KC and 29 eyes of 29 healthy controls were included in this prospective unmasked case-control study. The uncorrected (UCVA) and spectacle-corrected (SCVA) Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuities based on refractions derived from LRT in central and four eccentric zones were compared to those achieved with standard autorefraction...
November 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27492096/influence-of-ophthalmic-viscosurgical-devices-on-intraoperative-aberrometry
#11
Samuel Masket, Nicole R Fram, Jack T Holladay
PURPOSE: To determine whether the presence of an ophthalmic viscosurgical device (OVD) in the anterior chamber influences intraoperative aberrometry and the suggested intraocular lens (IOL) power. SETTING: Advanced Vision Care, Los Angeles, and Specialty Surgery Center, Beverly Hills, California, USA. DESIGN: Prospective interventional case series. METHOD: Eyes scheduled for routine phacoemulsification and were divided into 6 equal groups, with each having 1 of 6 OVDs...
July 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27463628/comparative-study-on-optical-performance-and-visual-outcomes-between-two-diffractive-multifocal-lenses-amo-tecnis-%C3%A2-zmb00-and-acrysof-%C3%A2-iq-restor-%C3%A2-multifocal-iol-sn6ad1
#12
Mario Augusto Pereira Dias Chaves, Wilson Takashi Hida, Patrick Frenzel Tzeliks, Michelle Rodrigues Gonçalves, Fernando de Bortoli Nogueira, Celso Takashi Nakano, Antonio Francisco Pimenta Motta, André Gustavo Rolim de Araújo, Milton Ruiz Alves
PURPOSE: To compare the optical performance and visual outcomes between two diffractive multifocal lenses: AMO Tecnis® ZMB00 and AcrySof® ReSTOR® SN6AD1. METHODS: This prospective, non-randomized comparative study included the assessment of 74 eyes in 37 patients referred for cataract surgery and candidates for multifocal intraocular lens implants. Exclusion criteria included existence of any other eye disease, previous eye surgery, high axial myopia, preoperative corneal astigmatism of >1...
May 2016: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/27400076/clinical-outcomes-after-cataract-surgery-with-a-new-transitional-toric-intraocular-lens
#13
Tiago B Ferreira, Tos T J M Berendschot, Filomena J Ribeiro
PURPOSE: To evaluate the visual outcomes of patients who underwent cataract surgery with implantation of a transitional toric monofocal intraocular lens (IOL) (Precizon Toric IOL, model 565; Ophtec BV, Groningen, The Netherlands). METHODS: In this prospective case series, 51 eyes of 39 patients with cataract and regular keratometric astigmatism between 1.00 and 4.50 diopters (D) that had phacoemulsification with implantation of a Precizon Toric IOL were included...
July 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27391538/repeatability-and-reproducibility-of-virtual-subjective-refraction
#14
Sara Perches, M Victoria Collados, Jorge Ares
PURPOSE: To establish the repeatability and reproducibility of a virtual refraction process using simulated retinal images. METHODS: With simulation software, aberrated images corresponding with each step of the refraction process were calculated following the typical protocol of conventional subjective refraction. Fifty external examiners judged simulated retinal images until the best sphero-cylindrical refraction and the best visual acuity were achieved starting from the aberrometry data of three patients...
October 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27391537/topographic-tomographic-and-aberrometric-characteristics-of-post-lasik-ectasia
#15
Prema Padmanabhan, Sudhir Rachapalle Reddi, Poornima Devi Sivakumar
PURPOSE: To report the refractive, topographic, tomographic, and aberrometric characteristics of post-LASIK ectasia; to compare these characteristics with normal post-LASIK controls; and to propose a comprehensive system to grade the severity of post-LASIK ectasia. METHODS: The refraction, corrected distance visual acuity (CDVA), magnitude, and location of the steepest and thinnest point on the cornea, the highest anterior and posterior surface elevation, the radius of best fit sphere, corneal asphericity, and corneal aberrations were measured in 50 eyes of 29 patients with post-LASIK ectasia...
July 6, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27373387/intraoperative-aberrometry-versus-standard-preoperative-biometry-and-a-toric-iol-calculator-for-bilateral-toric-iol-implantation-with-a-femtosecond-laser-one-month-results
#16
Michael G Woodcock, Robert Lehmann, Robert J Cionni, Michael Breen, Maria C Scott
PURPOSE: To compare astigmatic outcomes in patients with bilateral cataracts having toric intraocular lens (IOL) implantation with intraoperative aberrometry measurements in 1 eye and standard power calculation and a toric IOL calculator with inked axis marking in the contralateral eye. SETTING: Twelve sites in the United States. DESIGN: Prospective cohort study. METHODS: The eye with the more visually significant cataract was randomized to intraoperative aberrometry measurements (Ocular Response Analyzer with Verifeye) or standard preoperative biometry and use of a toric calculator with the contralateral eye automatically assigned to the other group...
June 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27239583/effectiveness-of-technolas-torsional-eye-tracking-system-on-visual-outcomes-after-photorefractive-keratectomy
#17
Hamid Gharaee, Siamak Zaree Ghanavati, Saeed Shokoohi Rad, Arash Omidtabrizi, Hashem Naseri
PURPOSE: To investigate the efficacy of Technolas 217Z eye tracking system (torsional component) in corneal surface irregularity and high order aberrations (HOAs) after photorefractive keratectomy. METHODS: Patients with compound myopic astigmatism among persons demanding refractive surgery in Khatam-al-Anbia Eye Hospital with the mean age of 29 years were enrolled in this double-blind randomized interventional study. The mean spherical equivalent (SE) of refractive error was -4...
September 2015: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/27237964/investigating-the-utility-of-clinical-assessments-to-predict-success-with-presbyopic-contact-lens-correction
#18
Ahmed Sivardeen, Deborah Laughton, James S Wolffsohn
PURPOSE: To determine the utility of a range of clinical and non-clinical indicators to aid the initial selection of the optimum presbyopic contact lens. In addition, to assess whether lens preference was influenced by the visual performance compared to the other designs trialled (intra-subject) or compared to participants who preferred other designs (inter-subject). METHODS: A double-masked randomised crossover trial of Air Optix Aqua multifocal, PureVision 2 for Presbyopia, Acuvue OASYS for Presbyopia, Biofinity multifocal and monovision was conducted on 35 presbyopes (54...
October 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27164431/effects-of-epiblepharon-surgery-on-higher-order-aberrations
#19
Hwa Lee, Sungmin Jang, Minsoo Park, Jinhwan Park, Sehyun Baek
PURPOSE: To quantify and compare higher-order aberrations (HOAs) in children after epiblepharon surgery. METHODS: The medical records of children (mean age, 7.3 years [range, 2-13 years]) who underwent surgery for epiblepharon were reviewed retrospectively. Aberrometry was conducted before surgery and at 1 month's and 3 months' follow-up using the Wavefront Analyzer KR-1W. Corneal HOAs in the 4 mm and 6 mm optical zones were compared. Classification of the severity of epiblepharon was based on the degree of cilia touching the cornea and corneal erosion...
June 2016: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/27086550/effect-of-light-scattering-and-higher-order-aberrations-on-visual-performance-in-eyes-with-granular-corneal-dystrophy
#20
Kazutaka Kamiya, Hidenaga Kobashi, Akihito Igarashi, Nobuyuki Shoji, Kimiya Shimizu
This study was aimed to assess the relationship of intraocular forward scattering, corneal backward scattering, and corneal higher-order aberrations (HOAs) with corrected distance visual acuity (CDVA) in eyes with granular corneal dystrophy (GCD). We retrospectively examined forty two eyes of 42 consecutive patients who diagnosed GCD, and age-matched 20 eyes of 20 healthy subjects. We assessed objective scattering index (OSI) using the double-pass instrument (OQAS II, Visiometrics), corneal densitometry (CD) using the Scheimpflug rotating camera (Pentacam HR, Oculus), and corneal HOAs using the Hartmann-Shack aberrometry (KR-9000, Topcon)...
2016: Scientific Reports
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