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Refractive surgery

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https://www.readbyqxmd.com/read/28549845/tomographic-analysis-of-anterior-posterior-and-total-corneal-refractive-power-changes-after-femtosecond-laser-assisted-keratotomy
#1
Franziska Löffler, Myriam Böhm, Michael Herzog, Kerstin Petermann, Thomas Kohnen
PURPOSE: To analyze the effect of penetrating femtosecond laser-assisted keratotomy (pFLAK) during laser lens surgery on anterior, posterior corneal astigmatism and total corneal refractive power (TCRP) astigmatism (CAant, CApost, CATCRP) measured with Scheimpflug tomography. DESIGN: Prospective, interventional case series. METHODS: This institutional study included 27 eyes of 23 patients (65 ± 8 years) with low to moderate CATCRP determined with Scheimpflug tomography (Pentacam HR) after penetrating femtosecond laser-assisted keratotomy (pFLAK) and laser lens surgery...
May 23, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28544605/assessment-of-meibomian-glands-and-tear-film-in-post-refractive-surgery-patients
#2
Ji Won Jung, Jung Yong Kim, Hee Seung Chin, Young Ju Suh, Tae-Im Kim, Kyoung Yul Seo
IMPORTANCE: Corneal refractive surgery may impact meibomian gland and tear film in post-refractive surgery patients. BACKGROUND: To compare ocular surface parameters between post-refractive surgery patients and normal controls. DESIGN: Cross-sectional single center study PARTICIPANTS: A total of 120 eyes of 120 subjects were divided into three groups: (i) 60 controls and 60 patients underwent corneal refractive surgery at least 12 months ago; (ii) 30 post-laser in-situ keratomileusis (LASIK) patients and (iii) 30 post-laser epithelial keratomileusis (LASEK)/photo-refractive keratectomy (PRK) patients...
May 22, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28542088/corneal-breakthrough-haze-after-photorefractive-keratectomy-with-mitomycin-c-incidence-and-risk-factors
#3
Igor Kaiserman, Naʼava Sadi, Michael Mimouni, Tzahi Sela, Gur Munzer, Shmuel Levartovsky
PURPOSE: To identify preoperative and intraoperative factors affecting breakthrough corneal haze incidence after photorefractive keratectomy (PRK) with mitomycin C (MMC). METHODS: In this retrospective study of PRK performed at the Care Vision Refractive Laser Center, Tel Aviv, Israel, a total of 7535 eyes (n = 3854 patients; mean age ± SD, 26 ± 6 years; 55% men) underwent PRK with intraoperative MMC application. Patients with histories of corneal pathology or surgery were excluded...
May 23, 2017: Cornea
https://www.readbyqxmd.com/read/28540082/a-meta-analysis-comparing-postoperative-complications-and-outcomes-of-femtosecond-laser-assisted-cataract-surgery-versus-conventional-phacoemulsification-for-cataract
#4
REVIEW
Zi Ye, Zhaohui Li, Shouzhi He
Objective. This meta-analysis aimed to compare the outcomes and postoperative complications between femtosecond laser-assisted cataract surgery (FLACS) and conventional phacoemulsification cataract surgery (CPCS). Methods. Bibliographic databases, including PubMed, Embase, and Cochrane library, were systematically searched for references on or before September 2015 regarding the outcomes and complications by FLACS or CPCS. Data on corneal endothelial cell loss, uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refractive outcomes, and postoperative complications were retrieved...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28540007/anterior-chamber-depth-change-following-cataract-surgery-in-pseudoexfoliation-syndrome-a-preliminary-study
#5
Mohammad Reza Fallah Tafti, Hossein Abdollah Beiki, S Farzad Mohammadi, Golshan Latifi, Elham Ashrafi, Zahra Fallah Tafti
PURPOSE: To assess the pseudophakic anterior chamber depth (PP-ACD) or effective lens position (ELP) change after cataract surgery in patients with pseudoexfoliation syndrome (PEX). METHODS: Consecutive eyes with PEX and cataract underwent standard phacoemulsification and were implanted with single-piece acrylic posterior chamber intraocular lenses (IOLs). Eyes with severe PEX and with axial length (AL) greater than 24 mm or less than 22 mm were not included. Eyes with capsular complication or unstable bags that needed capsular tension ring insertion were excluded...
April 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28540005/post-photorefractive-keratectomy-pain-and-corneal-sub-basal-nerve-density
#6
Masoumeh Mohebbi, Amin Rafat-Nejad, Seyed-Farzad Mohammadi, Kosar Asna-Ashari, Maryam Kasiri, Saeed Heidari-Keshel, Farshad Askarizadeh
PURPOSE: The perceived and reported pain of patients receiving photorefractive keratectomy (PRK) widely varies. We assessed the potential role of the subbasal nerve plexus density as a predictor of postoperative pain level. Consecutive patients scheduled to undergo PRK at the Refractive Surgery Clinic of Farabi Eye Hospital, Tehran, were approached. METHODS: Forty-nine myopic left eyes from 49 patients who consented to undergo scanning slit confocal microscopy assessments preoperatively were included...
April 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28540004/the-association-of-central-corneal-thickness-with-ocular-and-general-parameters-in-a-community-setting-the-yazd-eye-study
#7
Reza Soleimanizad, Mohammad Hosein Nowroozzadeh, Hossein Ziaei, Mohammad Pakravan, Mehdi Yaseri, Marzieh Katibeh
PURPOSE: To assess central corneal thickness (CCT) and its associations in an adult Iranian population. METHODS: This was a population-based cross-sectional study of adults aged 40-80 years. Eyes with corneal disorders, previous ocular surgery, or trauma were excluded. All subjects underwent complete ophthalmic examination, general health assessment, laboratory tests, and a detailed interview. CCT was measured with an ultrasonic pachymeter. Intraocular pressure (IOP) was measured with Goldmann applanation tonometry...
April 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28539328/dynamic-response-toinitial-stage-blindnessin-visual-system-development
#8
Erping Long, Xiayin Zhang, Zhenzhen Liu, Xiaohang Wu, Xuhua Tan, Duoru Lin, Qianzhong Cao, Jingjing Chen, Zhuoling Lin, Dongni Wang, Xiaoyan Li, Jing Li, Jinghui Wang, Wangting Li, Haotian Lin, Weirong Chen, Yizhi Liu
Sensitive periods and experience-dependent plasticity have become core issues in visual system development. Converging evidence indicates that visual experience is an indispensable factor in establishing mature visual system circuitry during sensitive periods and the visual system exhibits substantial plasticity when facing deprivation. The mechanisms that underlie the environmental regulation of visual system development and plasticity are of great interest but need further exploration. Here, we investigated a unique sample of human infants who experienced initial stage blindness (beginning at birth and lasting 2 to 8 months) before the removal of bilateral cataracts...
May 24, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28539273/ion-paired-pirenzepine-loaded-micelles-as-an-ophthalmic-delivery-system-for-the-treatment-of-myopia
#9
Yanan Li, Yong Zhang, Pengmei Li, Gujie Mi, Jiasheng Tu, Linlin Sun, Thomas J Webster, Yan Shen
Myopia is one of the most common ocular disorders for which standard treatments, such as refractive surgery, often involve invasive procedures. Pirenzepine (PRZ), a muscarinic receptor antagonist, has been recognized as a promising candidate for the treatment of myopia, but possesses poor ocular bioavailability. The overall objective of this study was to prepare PRZ-sorbic acid complexes suitable to be encapsulated into micelles with high efficiency for optimal ophthalmic delivery. The results demonstrated that sorbic acid, used as the counter ion, had the most significant effects in increasing octanol-water distribution coefficient of PRZ as well as improving its corneal permeability in vitro among various counter ions tested...
May 21, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28532939/guiding-flying-spot-laser-transepithelial-phototherapeutic-keratectomy-with-optical-coherence-tomography
#10
REVIEW
Yan Li, Hideaki Yokogawa, Maolong Tang, Winston Chamberlain, Xinbo Zhang, David Huang
PURPOSE: To analyze transepithelial phototherapeutic keratectomy (PTK) results using optical coherence tomography (OCT) and develop a model to guide the laser dioptric and depth settings. SETTING: Casey Eye Institute, Portland, Oregon, USA. DESIGN: Prospective nonrandomized case series. METHODS: Patients with superficial corneal opacities and irregularities had transepithelial PTK with a flying-spot excimer laser by combining wide-zone myopic and hyperopic astigmatic ablations...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532936/intraoperative-aberrometry-versus-preoperative-biometry-for-intraocular-lens-power-selection-in-axial-myopia
#11
Darren C Hill, Shruti Sudhakar, Christopher S Hill, Tonya S King, Ingrid U Scott, Brett B Ernst, Seth M Pantanelli
PURPOSE: To compare the accuracy of intraoperative wavefront aberrometry (ORA) and the Hill-radial basis function (RBF) formula with other formulas based on preoperative biometry in predicting residual refractive error after cataract surgery in eyes with axial myopia. SETTING: Private practice, Harrisburg, Pennsylvania, USA. DESIGN: Retrospective consecutive case series. METHODS: Eyes with an axial length (AL) greater than 25...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532935/toric-outcomes-computer-assisted-registration-versus-intraoperative-aberrometry
#12
Jonathan D Solomon, John Ladas
PURPOSE: To compare refractive outcomes of intraoperative computer-assisted registration and intraoperative aberrometry for the reduction of cylinder during toric intraocular lens (IOL) placement. SETTING: Bowie Vision Institute, Bowie, Maryland, USA. DESIGN: Prospective randomized case series. METHOD: The patients were divided into 2 groups that had toric IOL implantation after phacoemulsification. The intraoperative computer-assisted registration group (Group 1) had preoperative toric calculations...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532931/infectious-keratitis-after-laser-vision-correction-incidence-and-risk-factors
#13
Julie M Schallhorn, Steven C Schallhorn, Keith Hettinger, Stephen Hannan
PURPOSE: To describe the incidence and risk factors associated with microbial keratitis in a large population of laser vision correction (LVC) patients. SETTING: Optical Express centers, Glasgow, United Kingdom. DESIGN: Retrospective case series. METHODS: Records were searched to identify all cases of presumed microbial keratitis after LVC between January 1, 2008, and April 1, 2015. Consecutive patients having primary or enhancement LVC during that time served as controls...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532929/visual-and-refractive-outcomes-of-small-incision-lenticule-extraction-in-mild-moderate-and-high-myopia-six-month-results
#14
Magda A Torky, Yousif A Alzafiri
PURPOSE: To evaluate the efficacy, safety, predictability, and stability of small-incision lenticule extraction in low, moderate, and high myopia. DESIGN: Prospective case series. METHODS: Eyes were divided into a low myopia group (spherical equivalent [SE] refraction -1.00 to -3.00 diopters [D]), moderate myopia group (SE refraction of -3.25 to -6.00 D), and high myopia group (SE refraction -6.25 to -10.00 D). Small-incision lenticule extraction surgery was performed, and outcomes were reported 6 months postoperatively...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532924/standard-for-reporting-refractive-outcomes%C3%A2-of-intraocular-lens-based-refractive-surgery
#15
EDITORIAL
Dan Z Reinstein, Timothy J Archer, Sathish Srinivasan, Nick Mamalis, Thomas Kohnen, William J Dupps, J Bradley Randleman
No abstract text is available yet for this article.
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28526552/anisometropia-at-age-5-years-after-unilateral-intraocular-lens-implantation-during-infancy-in-the-infant-aphakia-treatment-study-iats
#16
David Weakley, George Cotsonis, M Edward Wilson, David A Plager, Edward G Buckley, Scott R Lambert
PURPOSE: To report the prevalence of anisometropia at age 5 years after unilateral intraocular lens (IOL) implantation in infants. DESIGN: Prospective randomized clinical trial METHODS: Fifty-seven infants in the Infant Aphakia Treatment Study (IATS) with a unilateral cataract were randomized to IOL implantation with an initial targeted postoperative refractive error of either +8D (infants 28 to <48 days of age) or +6D (infants 48-210 days of age). Anisometropia was calculated at age 5 years...
May 16, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28523526/iris-fixated-phakic-intraocular-lens-implantation-in-an-adult-with-retinopathy-of-prematurity-1-year-follow-up
#17
Young Shin Kim, Jin Kwon Chung, Sung Jin Lee
PURPOSE: To report a case of iris-fixated phakic intraocular lens (pIOL) implantation in a patient with an extremely steep cornea, shallow anterior chamber, and small corneal diameter caused by retinopathy of prematurity (ROP) and scleral encircling. METHODS: Case report. RESULTS: Iris-fixated pIOLs were implanted in a 19-year-old patient with refraction of -18.5 -0.75 × 180 in the right eye and -15.5 -1.25 × 180 in the left eye. The keratometric values were 53...
May 18, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28512581/refractive-lens-exchange-combined-with-primary-posterior-vitrectorhexis-in-highly-myopic-patients
#18
Tarek A Mohamed, Wael Soliman, Dalia M El Sebaity, Ahmed M Fathalla
Purpose. To evaluate efficacy and safety of primary vitrectorhexis for posterior capsulotomy in highly myopic patients undergoing refractive lens exchange. Methods. The study is a prospective nonrandomized interventional study. The study comprised 60 eyes of 60 myopic patients. All patients underwent refractive lens exchange (RLE) and foldable IOL implantation combined with primary posterior capsulotomy. We used a 23-gauge vitrectomy probe for the creation of the posterior capsule opening. We followed the patients for one year...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28494492/biomechanical-differences-between-femtosecond-lenticule-extraction-flex-and-small-incision-lenticule-extraction-smile-tested-by-2d-extensometry-in-ex-vivo-porcine-eyes
#19
Bogdan Spiru, Sabine Kling, Farhad Hafezi, Walter Sekundo
Purpose: To evaluate the biomechanical stability of ex vivo porcine corneas after femtosecond lenticule extraction (FLEx) and small incision lenticule extraction (SmILE) refractive surgeries. Methods: Forty-five porcine eyes were equally divided into three groups: Groups 1 and 2 were treated with FLEx and SmILE procedure, respectively. Group 3 served as control. A refractive correction of -14 diopters (D) with a 7-mm zone using either a 160-μm flap (FLEx) or a 160-μm cap (SmILE) was performed...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28494159/association-of-visual-acuity-with-ocular-dominance-in-2045-myopic-patients
#20
Dan Zhou, Ni Ni, Aiping Ni, Qinjin Chen, Dan-Ning Hu, Jibo Zhou
PURPOSE: Previous studies of the relationship between visual acuity (VA) and ocular dominance have produced conflicting results. We hypothesized that (1) the discrepancies were related mostly to sample size and interocular visual acuity difference (IOVAD); (2) in large samples of individuals with marked IOVADs, the eye with the better uncorrected distance visual acuity (UDVA) would be dominant. These hypotheses were tested in a large group of myopic patients. METHODS: This prospective study of cycloplegic refraction involved 2045 myopic refractive surgery candidates...
May 11, 2017: Current Eye Research
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