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https://www.readbyqxmd.com/read/29425390/corneal-apical-scar-after-hyperopic-excimer-laser-refractive-surgery-long-term-follow-up-of-treatment-with-sequential-customized-therapeutic-keratectomy
#1
Paolo Vinciguerra, Fabrizio I Camesasca, Emanuela Morenghi, Claudio Azzolini, Luca Pagano, Silvia Trazza, Riccardo Vinciguerra
PURPOSE: To evaluate long-term results of sequential customized therapeutic keratectomy (SCTK) in highly aberrated corneas with apical scars consequent to hyperopic excimer laser refractive surgery. METHODS: Fifteen eyes of 12 patients treated with SCTK for a corneal apical scar after hyperopic excimer laser refractive surgery were retrospectively evaluated. SCTK is a sequence of custom therapeutic excimer laser keratectomies where the results are monitored step-by-step by intraoperative corneal topography...
February 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29408829/femtosecond-laser-assisted-small-incision-endokeratophakia-using-a-xenogeneic-lenticule-in-rhesus-monkeys
#2
Miao He, He Jin, Hong He, Hui Ding, Wei Wang, Liangping Liu, Chi Zhang, Xingwu Zhong
PURPOSE: To evaluate the feasibility and safety of xenogeneic endokeratophakia in rhesus monkeys and to explore the effects of a concave lenticule on refractive power. METHODS: Three adult New Zealand white rabbits and 6 healthy rhesus monkeys were used. The xenogenic concave grafts were created from the rabbits using a modified small incision lenticule extraction technique; after being cryopreserved in glycerol for 1 week, the grafts were implanted into the monkey recipient corneas...
March 2018: Cornea
https://www.readbyqxmd.com/read/29403584/visual-outcomes-and-refractive-status-after-combined-silicone-oil-removal-cataract-surgery-with-intraocular-lens-implantation
#3
Hussain F Al-Habboubi, Waseem Al-Zamil, Ali A Al-Habboubi, Rajiv Khandekar
Purpose: To evaluate refractive status and identify predictors of surgical success following a combined silicone oil removal/cataract surgery with intraocular lens (IOL) implantation procedure. Methods: In this single-armed, retrospective study, we reviewed patients who underwent vitreoretinal surgery followed by a combined silicone oil removal/cataract surgery procedure between 2009 and 2013. Preoperative data included patient demographics, refractive status, IOL power, and axial length (measured with the IOL Master)...
January 2018: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29401180/blur-detection-depth-of-field-and-accommodation-in-emmetropic-and-hyperopic-children
#4
Tawna L Roberts, Scott B Stevenson, Julia S Benoit, Ruth E Manny, Heather A Anderson
SIGNIFICANCE: Our results demonstrate that blur detection thresholds are elevated in young children compared with adults, and poorer blur detection thresholds are significantly correlated with the magnitude of accommodative microfluctuations. Given that accommodative microfluctuations are greater with greater accommodative responses, these findings may have implications for young uncorrected hyperopes. PURPOSE: This study investigated the association between subjective blur detection thresholds and accommodative microfluctuations in children 3 years to younger than 10 years old and adults...
February 3, 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29380408/analysing-the-impact-of-myopia-on-the-stiles-crawford-effect-of-the-first-kind-using-a-digital-micromirror-device
#5
Alessandra Carmichael Martins, Brian Vohnsen
PURPOSE: Photoreceptor light acceptance is closely tied to the Stiles-Crawford effect of the first kind (SCE-I). Whether the SCE-I plays a role in myopic development remains unclear although a reduction in directionality has been predicted for high myopia. The purpose of this study is to analyse the relationship between foveal SCE-I directionality, axial eye length, and defocus for emmetropic subjects wearing ophthalmic trial lenses during psychophysical measurements and for myopic subjects with their natural correction...
January 30, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29380406/foveal-vision-power-errors-induced-by-spectacle-lenses-designed-to-correct-peripheral-refractive-errors
#6
Sergio Barbero, Miguel Faria-Ribeiro
PURPOSE: Radial Refractive Gradient (RRG) spectacles are lenses specifically designed to minimize peripheral hyperopic defocus typically found in conventional spectacles. Our goals were: (1) to demonstrate a method to design such lenses; and (2) to quantify the exact foveal vision power errors induced by them. METHODS: The design procedure was based on a point-by-point sequential surface construction algorithm that designs a front aspheric surface (back surface is spherical) to achieve a given overall tangential focal length of the lens...
January 30, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29368006/the-adenosine-receptor-antagonist-7-methylxanthine-alters-emmetropizing-responses-in-infant-macaques
#7
Li-Fang Hung, Baskar Arumugam, Lisa Ostrin, Nimesh Patel, Klaus Trier, Monica Jong, Earl L Smith Iii
Purpose: Previous studies suggest that the adenosine receptor antagonist, 7-methylxanthine (7-MX), retards myopia progression. Our aim was to determine whether 7-MX alters the compensating refractive changes produced by defocus in rhesus monkeys. Methods: Starting at age 3 weeks, monkeys were reared with -3 diopter (D; n = 10; 7-MX -3D/pl) or +3D (n = 6; 7-MX +3D/pl) spectacles over their treated eyes and zero-powered lenses over their fellow eyes. In addition, they were given 100 mg/kg of 7-MX orally twice daily throughout the lens-rearing period (age 147 ± 4 days)...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29367202/prevalence-and-incidence-of-presbyopia-in-urban-southern-china
#8
Xiaotong Han, Pei Ying Lee, Stuart Keel, Mingguang He
AIMS: To investigate the prevalence and incidence of presbyopia in an urban Chinese population. METHODS: 1817 subjects aged ≥35 years were identified by random cluster sampling in Yuexiu District, Guangzhou, China, at baseline in 2008, and all were invited for the follow-up examination in 2014. Distance and near visual acuity (VA) tests, as well as non-cycloplegic automated refraction were performed at each examination as per standardised protocol. Participants with presenting near VA ≤20/40 were further tested with add power at a standard distance of 40 cm to obtain their best-corrected near VA...
January 24, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29358627/predictability-of-intraocular-lens-power-calculation-for-cataract-with-keratoconus-a-multicenter-study
#9
Kazutaka Kamiya, Kei Iijima, Shoji Nobuyuki, Yosai Mori, Kazunori Miyata, Takefumi Yamaguchi, Jun Shimazaki, Shinya Watanabe, Naoyuki Maeda
This study was aimed to assess the predictability of intraocular lens (IOL) power calculation after cataract surgery for keratoconus. We retrospectively reviewed the clinical charts of 102 eyes of 71 consecutive keratoconic patients who developed cataract. We determined manifest spherical equivalent, prediction errors, and absolute errors, 1 month postoperatively. The achieved refraction was significantly more hyperopic than the targeted refraction, when keratometric readings were used (p = 0.001). At 1 month, 36% and 63% of the eyes were within ±0...
January 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335096/clinically-significant-laser-in%C3%A2-situ-keratomileusis-flap-striae
#10
Avi Wallerstein, Mathieu Gauvin, Eser Adiguzel, Harmanjit Singh, Vasudha Gupta, Mona Harissi-Dagher, Mark Cohen
PURPOSE: To describe the incidence, risk factors, and outcomes before and after irrigation of clinically significant laser in situ keratomileusis (LASIK) flap striae. SETTING: Multisurgeon multicenter standardized protocol practice. DESIGN: Retrospective case-control series. METHODS: Eyes with striae necessitating flap relift and irrigation were identified. Preoperative, intraoperative, and postoperative variables were collected...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29329973/altered-gene-expression-in-tree-shrew-retina-and-retinal-pigment-epithelium-produced-by-short-periods-of-minus-lens-wear
#11
Li He, Michael R Frost, John T Siegwart, Thomas T Norton
Hyperopic refractive error is detected by retinal neurons, which generate GO signals through a direct emmetropization signaling cascade: retinal pigment epithelium (RPE) into choroid and then into sclera, thereby increasing axial elongation. To examine signaling early in this cascade, we measured gene expression in the retina and RPE after short exposure to hyperopia produced by minus-lens wear. Gene expression in each tissue was compared with gene expression in combined retina + RPE. Starting 24 days after normal eye opening, three groups of juvenile tree shrews (n = 7 each) wore a monocular -5 D lens...
January 9, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29315718/experimental-investigation-of-accommodation-in-eyes-fit-with-multifocal-contact-lenses-using-a-clinical-auto-refractor
#12
Basal H Altoaimi, Pete Kollbaum, Dawn Meyer, Arthur Bradley
PURPOSE: Multifocal or multi-zone contact lenses are increasingly being fit to young eyes in an attempt to control myopia progression. However, success in achieving this aim may depend on how much the eye accommodates. The purpose of the current work was to evaluate the ability of an open-field clinical autorefractor to measure on-axis refractive state and accommodation in eyes fit with multifocal contact lenses (CLs). METHODS: Refractive state was measured with a Grand Seiko WAM-5500 autorefractor (www...
January 8, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29315438/femtosecond-laser-assisted-lasik-with-and-without-the-adjuvant-use-of-mitomycin-c-to-correct-hyperopia
#13
Montserrat Garcia-Gonzalez, MariLuz Iglesias-Iglesias, Pilar Drake Rodriguez-Casanova, Juan Gros-Otero, Miguel A Teus
PURPOSE: To compare the visual and refractive results of femtosecond laser-assisted LASIK (FS-LASIK) with and without the adjuvant use of mitomycin C (MMC) to correct hyperopia. METHODS: A total of 152 consecutive hyperopic eyes were included in this retrospective, observational cohort study, comparing 76 eyes treated with FS-LASIK + MMC with 76 age- and refraction-matched eyes treated with FS-LASIK without MMC. Visual and refractive results were evaluated 1 day, 1 week, and 1, 3, 6, and 15 months postoperatively...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29315435/femtosecond-lenticule-extraction-flex-for-spherocylindrical-hyperopia-using-new-profiles
#14
Walter Sekundo, Anke Messerschmidt-Roth, Dan Z Reinstein, Timothy J Archer, Marcus Blum
PURPOSE: To investigate new lenticule profiles for the treatment of hyperopia by femtosecond lenticule extraction (FLEx) for spherocylindrical hyperopia using a modified laser scan sequence. METHODS: In this prospective 9-month study, 39 eyes of 22 patients with the mean age of 49 years (range: 27 to 56 years) underwent hyperopic FLEx. The mean optical zone was 6 mm (range: 5.75 to 6.75 mm) with keratometry readings and magnitude of correction adjusted mean transition zone of 2...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29285706/comparison-of-anterior-segment-parameters-and-axial-lengths-of-myopic-emmetropic-and-hyperopic-children
#15
Mehmethan Dogan, Ufuk Elgin, Emine Sen, Kemal Tekin, Pelin Yilmazbas
PURPOSE: To compare the anterior segment parameters of myopic, hyperopic, and emmetropic children by using optical biometry. METHODS: This prospective cross-sectional study included 150 eyes of 150 children between 6 and 16 years old. The eyes were divided into three groups according to their spherical equivalent (SE) refractive error values as myopic [between - 1.0 and - 6.0 diopter (D)], emmetropic (between + 0.50 and - 0.50 D), and hyperopic (between + 1...
December 29, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/29236204/the-burden-of-pure-anisometropic-amblyopia-a-cross-sectional-study-on-2800-iranians
#16
Siamak Akbarzadeh, Reihaneh Vahabi, Nooshin Bazzazi, Ghodratollah Roshanaei, Samira Heydarian, Daniel F Fouladi
PURPOSE: To assess the proportion of pure anisometropic amblyopia in a sample Iranian (white) population. METHODS: A total of 2800 consecutive individuals who presented at a referral eye clinic for any reason were examined for the presence of pure anisometropic amblyopia. Anisometropia was reported when a spherical equivalent refraction difference of at least 1.0 D with or without a cylinder refraction difference of at least 1.0 D was present between the two eyes...
December 13, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/29235256/automated-refraction-is-stable-1%C3%A2-week-after-uncomplicated-cataract-surgery
#17
Christoffer Ostri, Stig K Holfort, Marianne S Fich, Per Riise
PURPOSE: To compare automated refraction 1 week and 1 month after uncomplicated cataract surgery. METHODS: In this prospective cohort study, we recruited patients in a 2-month period and included consecutive patients scheduled for bilateral small-incision phacoemulsification cataract surgery. The exclusion criteria were (i) corneal and/or retinal pathology that could lead to automated refraction miscalculation and (ii) surgery complications. Automated refraction was measured 1 week and 1 month after surgery...
December 13, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29230414/analysis-of-the-ocular-refractive-state-in-fighting-bulls-astigmatism-prevalence
#18
Juan M Bueno, Matteo Lo Sapio, J Manuel Sanes, Juan Seva
The purpose of this study was to describe the ocular refractive state (ORS) of fighting bulls. The study consisted of 90 ophthalmological healthy animals (85 in post-mortem and 5 in living conditions, resp.). The ORS of the eyes (2 per animal) was determined using streak retinoscopy. In vivo animals were assessed at a fighting bull farm facility. Post-mortem measurements were carried out at a local arena. The ORS along the horizontal meridian ranged between -1.00 and +2.50 diopters (D), with a mean of +0.66 ± 0...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29227511/predictive-formula-for-refraction-of-autologous-lenticule-implantation-for-hyperopia-correction
#19
Meng Li, Meiyan Li, Ling Sun, Katherine Ni, Xingtao Zhou
PURPOSE: To create a formula to predict refractive correction of autologous lenticule implantation for correction of hyperopia (with myopia in one eye and hyperopia in the contralateral eye). METHODS: In this prospective study, 10 consecutive patients (20 eyes) who had myopia in one eye and hyperopia in the contralateral eye were included. The preoperative spherical equivalent was -3.31 ± 1.73 diopters (D) for the myopic eyes and +4.46 ± 1.97 D for the hyperopic eyes...
December 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29227507/the-use-of-capsular-tension-rings-to-reduce-refractive-shift-in-patients-with-implantation-of-trifocal-intraocular-lenses
#20
Kristin Nistad, Frida Göransson, Eivind Støle, Hossein Shams, Björn Gjerdrum
PURPOSE: To determine whether use of a capsular tension ring (CTR) can increase refractive stability in patients with implantation of two different trifocal intraocular lenses (IOLs). METHODS: A prospective, consecutive series of eyes underwent refractive lens exchange with implantation of two different trifocal IOL designs: FineVision Micro F (non-toric) and FineVision POD FT (toric) (PhysIOL, Liege, Belgium). Power calculation was determined using the Haigis formula...
December 1, 2017: Journal of Refractive Surgery
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