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Aberrometry

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https://www.readbyqxmd.com/read/28407166/evaluation-of-the-true-wavefront-aberrations-in-eyes-implanted-with-a-rotationally-asymmetric-multifocal-intraocular-lens
#1
Vyas Akondi, Pablo Pérez-Merino, Eduardo Martinez-Enriquez, Carlos Dorronsoro, Nicolás Alejandre, Ignacio Jiménez-Alfaro, Susana Marcos
PURPOSE: Standard evaluation of aberrations from wavefront slope measurements in patients implanted with a rotationally asymmetric multifocal intraocular lens (IOL), the Lentis Mplus (Oculentis GmbH, Berlin, Germany), results in large magnitude primary vertical coma, which is attributed to the intrinsic IOL design. The new proposed method analyzes aberrometry data, allowing disentangling the IOL power pupillary distribution from the true higher order aberrations of the eye. METHODS: The new method of wavefront reconstruction uses retinal spots obtained at both the near and far foci...
April 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28375373/pupil-motion-analysis-and-tracking-in-ophthalmic-systems-equipped-with-wavefront-sensing-technology
#2
Serge Meimon, Jessica Jarosz, Cyril Petit, Elena Gofas Salas, Kate Grieve, Jean-Marc Conan, Bruno Emica, Michel Paques, Kristina Irsch
Our eyes are constantly in motion, even during "steady" fixation. In ophthalmic systems equipped with wavefront technology, both eye and head motion potentially degrade its performance and/or increase the cost and complexity, as they induce a movement of the entrance optical pupil of the system. Here, we characterize the pupil motion in an aberrometry setting, using a custom, high-speed pupil tracker (478 Hz), and draw conclusions on design considerations of future ophthalmic systems. We also demonstrate the feasibility of tracking such motion directly with a custom-built Hartmann-Shack sensor (236 Hz) using a method that offers certain benefits over previously suggested approaches, thereby paving the way to an efficient and cost-effective approach...
March 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28225372/spherical-soft-contact-lens-designs-and-peripheral-defocus-in-myopic-eyes
#3
Kelly E Moore, Julia S Benoit, David A Berntsen
PURPOSE: Peripheral retinal defocus has been implicated in myopia progression. The effect of commercially available spherical soft contact lenses (SCLs) on peripheral defocus of adult myopic eyes was investigated. METHODS: Twenty-five young adults with spherical equivalent (SE) refractions between -0.50D and -6.00D were enrolled. Cycloplegic autorefraction (right eye) was measured centrally and ±20°, ±30°, and ±40° from the line of sight along the horizontal meridian using an autorefractor...
March 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28192585/correlations-of-objective-metrics-for-quantifying-dysfunctional-lens-syndrome-with-visual-acuity-and-phacodynamics
#4
Fernando Faria-Correia, Isaac Ramos, Bernardo Lopes, Tiago Monteiro, Nuno Franqueira, Renato Ambrósio
PURPOSE: To study the relationship between objective metrics for quantifying crystalline lens dysfunction with visual impairment and phacodynamics parameters in age-related nuclear cataracts. METHODS: A total of 51 eyes (34 patients) with age-related nuclear cataract had phacoemulsification. The Dysfunctional Lens Index (0 to 10 points) was measured by a ray-tracing aberrometry (iTrace Visual Function Analyzer; Tracey Technologies, Houston, TX). The average lens density (0 to 100) was evaluated using a rotating Scheimpflug system (Pentacam HR; Oculus Optikgeräte GmbH, Wetzlar, Germany), and the nuclear opalescence score was subjectively assessed using the Lens Opacities Classification System III (LOCS III)...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28152553/the-effect-of-aberrations-on-objectively-assessed-image-quality-and-depth-of-focus
#5
Antonio J Del Águila-Carrasco, Scott A Read, Robert Montés-Micó, D Robert Iskander
The effects of aberrations on image quality and the objectively assessed depth of focus (DoF) were studied. Aberrometry data from 80 young subjects with a range of refractive errors was used for computing the visual Strehl ratio based on the optical transfer function (VSOTF), and then, through-focus simulations were performed in order to calculate the objective DoF (using two different relative thresholds of 50% and 80%; and two different pupil diameters) and the image quality (the peak VSOTF). Both lower order astigmatism and higher order aberration (HOA) terms up to the fifth radial order were considered...
February 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28062928/evaluation-of-paraxial-forward-scattering-from-intraocular-lens-with-increased-surface-light-scattering-using-goniophotometry-and-hartmann-shack-wavefront-aberrometry
#6
Keiichiro Minami, Yoko Maruyama, Toshifumi Mihashi, Kazunori Miyata, Tetsuro Oshika
PURPOSE: To evaluate the influence of increases in light scattering on intraocular lens (IOL) surfaces on paraxial forward scattering using goniophotometry and Hartmann-Shack wavefront aberrometry. METHODS: Surface light scattering was reproduced experimentally by acceleratedly aging 4 intraocular lenses by 0, 3, 5, and 10 years each. Light scattering from both IOL surfaces was measured using Scheimpflug photography. The paraxial forward scattering from the aged IOLs was measured using a goniophotometer with a halogen light source (wavelength: 350-850 nm) and telecentric optics, and changes in the maximum intensity and full width at 10% of maximum intensity (FW10%) were evaluated...
March 2017: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27898448/laser-vision-correction-in-treating-myopia
#7
REVIEW
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
#8
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
#9
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
#10
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
#11
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
#12
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...
February 2017: 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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
COMPARATIVE STUDY
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
#19
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
#20
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
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