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cataract and refractive surgery

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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/28931181/-refractive-lens-exchange
#2
Fritz H Hengerer, Ina Conrad-Hengerer
In refractive surgery the removal of the natural lens followed by implantation of an artificial intraocular lens has been an established method to treat refractive errors. The term "clear lens exchange" separates this approach from cataract surgery, where a cloudy lens has to be removed. With regard to currently available intraocular lens technologies, there is a wide range to correct myopia, hyperopia as well as astigmatism. Trifocal or extended depth-of-focus lenses (EDOF) even with a toric component offer the patients a potential benefit to further address presbyopia, respectively...
September 20, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28926197/epiretinal-membrane-surgery-an-analysis-of-2-step-sequential-or-combined-phacovitrectomy-surgery-on-refraction-and-macular-anatomy-in-a-prospective-trial
#3
Hassan Hamoudi, Ulrik Correll Christensen, Morten La Cour
PURPOSE: To assess the impact of combined phacoemulsification-vitrectomy and sequential surgery for idiopathic epiretinal membrane (ERM) on refractive error (RE) and macular morphology. METHODS: In this prospective clinical trial, we allocated phakic eyes with ERM to (1) cataract surgery and subsequent pars plana vitrectomy (PPV) (CAT group), (2) PPV and subsequent cataract surgery (VIT group) or (3) phaco-vitrectomy (COMBI group). Examinations were at baseline, one month after each surgery, and at 3 months and 12 months of follow-up...
September 19, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28917405/comparison-of-refractive-and-keratometric-astigmatism-after-microincision-cataract%C3%A2-surgery
#4
Atsushi Kawahara, Yoshinori Takayanagi
PURPOSE: To measure the correlation between refractive and keratometric astigmatism after microincision cataract surgery (MICS). SETTING: Takayanagi Clinic, Kushiro, Hokkaido, Japan. DESIGN: Retrospective case series. METHODS: This study evaluated patients having phacoemulsification and intraocular lens implantation through a 2.0 mm temporal clear corneal incision. Refractive astigmatism and keratometric astigmatism were described by Jackson cross-cylinder with-the-rule (J0) and oblique (J45) components and compared using linear regression analysis...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28915799/analysis-of-various-factors-affecting-pupil-size-in-patients-with-glaucoma
#5
Ji Woong Park, Bong Hui Kang, Ji Won Kwon, Kyong Jin Cho
BACKGROUND: Pupil size is an important factor in predicting post-operative satisfaction. We assessed the correlation between pupil size, measured by Humphrey static perimetry, and various affecting factors in patients with glaucoma. METHODS: In total, 825 eyes of 415 patients were evaluated retrospectively. Pupil size was measured with Humphrey static perimetry. Comparisons of pupil size according to the presence of glaucoma were evaluated, as were correlations between pupil size and various factors, including age, logMAR best corrected visual acuity (BCVA), retinal nerve fiber layer (RNFL) thickness, spherical equivalent, intraocular pressure, axial length, central corneal thickness, white-to-white, and the kappa angle...
September 16, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28913996/intraocular-lens-power-calculation-after-refractive-surgery-a-comparative-analysis-of-accuracy-and-predictability
#6
Byeong Soo Kang, Jeong Mo Han, Joo Youn Oh, Mee Kum Kim, Won Ryang Wee
PURPOSE: To compare the accuracy of intraocular lens (IOL) power calculation using conventional regression formulae or the American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator for previous corneal refractive surgery. METHODS: We retrospectively reviewed 96 eyes from 68 patients that had undergone cataract surgery after keratorefractive surgeries. We calculated the formula with two approaches: IOL powers using the ASCRS IOL power calculator and IOL powers using conventional formulae with previous refractive data (Camellin, Jarade, Savini, and clinical history method) or without prior data (0, 2 and, 4 mm total mean power in topography, Wang-Koch-Maloney, Shammas, Seitz, and Maloney)...
June 29, 2017: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/28905823/refractive-outcomes-of-intraoperative-wavefront-aberrometry-versus-optical-biometry-alone-for-intraocular-lens-power-calculation
#7
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/28887114/ajo-centennial-cataract-surgery-from-1918-to-the-present-and-future-just-imagine
#8
Randall J Olson
PURPOSE: To review the history of cataract surgery over the past 100 years, and to offer predictions about new developments that may occur during the next 50 years. DESIGN: Interpretive essay. METHODS: Review of historical literature and author experiences pertaining to cataract surgery, with commentary and perspective. RESULTS: By this time, cataract surgery has advanced to the point that Kelman's introduction of phacoemulsification and use of intraocular lenses (IOLs), both very controversial when initially introduced, have become state of the art...
September 5, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28886257/prevalence-and-causes-of-visual-impairment-in-fundong-district-north-west-cameroon-results-of-a-population-based-survey
#9
Joseph Oye, Islay Mactaggart, Sarah Polack, Elena Schmidt, Violet Tamo, Marvice Okwen, Hannah Kuper
PURPOSE: To estimate the prevalence and causes of visual impairment in Fundong Health District, North West Cameroon. METHODS: A total of 51 clusters of 80 people (all ages) were sampled with probability proportionate to size and compact segment sampling. Visual acuity (VA) was measured with a tumbling "E" chart. An ophthalmic nurse examined people with VA<6/18 in either eye. The presence of hearing and physical impairments were assessed using clinical examination, and self-reported visual problems using the Washington Group Short Set...
September 8, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28885667/variations-in-retinal-nerve-fiber-layer-measurements-on-optical-coherence-tomography-after-implantation-of-trifocal-intraocular-lens
#10
Javier García-Bella, José M Martínez de la Casa, Paula Talavero González, José I Fernández-Vigo Escribano, Laura Valcarce Rial, Julián García-Feijóo
PURPOSE: To establish the changes produced after implantation of a trifocal intraocular lens (IOL) on retinal nerve fiber layer measurements performed with Fourier-domain optical coherence tomography (OCT). METHODS: This prospective study included 100 eyes of 50 patients with bilateral cataract in surgical range, no other associated ocular involvement, refractive errors between +5 and -5 spherical diopters, and less than 1.5 D of corneal astigmatism. The eyes were operated by phacoemulsification with implantation of 2 different trifocal IOLs (FineVision and AT LISA tri 839MP) in randomized equal groups...
September 5, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28885242/the-use-of-femtosecond-laser-in-refractive-and-cataract-surgery
#11
Natalie Homer, Ula V Jurkunas
No abstract text is available yet for this article.
2017: International Ophthalmology Clinics
https://www.readbyqxmd.com/read/28882754/mini-review-far-peripheral-vision
#12
Michael J Simpson
The region of far peripheral vision, beyond 60 degrees of visual angle, is important to the evaluation of peripheral dark shadows (negative dysphotopsia) seen by some intraocular lens (IOL) patients. Theoretical calculations show that the limited diameter of an IOL affects ray paths at large angles, leading to a dimming of the main image for small pupils, and to peripheral illumination by light bypassing the IOL for larger pupils. These effects are rarely bothersome, and cataract surgery is highly successful, but there is a need to improve the characterization of far peripheral vision, for both pseudophakic and phakic eyes...
September 9, 2017: Vision Research
https://www.readbyqxmd.com/read/28880334/a-multicenter-retrospective-survey-of-refractive-surgery-in-78-248-eyes
#13
Kazutaka Kamiya, Akihito Igarashi, Ken Hayashi, Kazuno Negishi, Masaki Sato, Hiroko Bissen-Miyajima
PURPOSE: To retrospectively evaluate the current practice, trends, and outcomes of refractive surgery in Japan. METHODS: This multicenter survey comprised 78,248 eyes of 39,727 consecutive patients who underwent refractive surgery at 45 major institutions in Japan. The corresponding ophthalmologists responded to a selfadministered questionnaire. The authors especially evaluated the safety, efficacy, predictability, stability, and adverse events of LASIK and phakic intraocular lens (IOL) implantation 3 months postoperatively...
September 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28860703/refractive-changes-after-lens-sparing-vitrectomy-for-macular-hole-and-epiretinal-membrane
#14
Tetsuya Muto, Tomoharu Nishimura, Takefumi Yamaguchi, Makoto Chikuda, Shigeki Machida
PURPOSE: Cataract progression after lens-sparing vitrectomy might differ according to original posterior segment diseases. Our objective was to analyze the refractive values after lens-sparing vitrectomy for macular hole (MH) and epiretinal membrane (ERM). MATERIALS AND METHODS: We reviewed the medical records of 25 MH patients (25 eyes) and 23 ERM patients (23 eyes) who underwent lens-sparing vitrectomy. Refractive changes in both groups were compared. All patients underwent 20-gauge three-port pars plana vitrectomy...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28859157/pseudophakic-retinal-detachment-in-young-aged-patients
#15
Thomas Laube, Claudia Brockmann, Nils Lehmann, Norbert Bornfeld
OBJECTIVE: To investigate the incidence and risk factors for retinal detachment (RD) after cataract surgery or refractive lens exchange (RLE) in patients aged below 61 years. METHODS: Retrospective medical chart review of 7,886 patients (13,925 eyes) who underwent cataract surgery or RLE. Patients aged below 61 years were selected. Age, gender, axial length, follow-up times, and the occurrence of RD were recorded. Additional characteristics documented for RD cases were: history of RD, preexisting retinal findings, laser capsulotomy, status of macula at RD, date and details of RD...
2017: PloS One
https://www.readbyqxmd.com/read/28857438/spectacle-use-after-routine-cataract-surgery-a-study-from-the-swedish-national-cataract-register
#16
Daniel B Farhoudi, Anders Behndig, Per Montan, Mats Lundström, Charlotta Zetterström, Maria Kugelberg
PURPOSE: To explore patients' obtaining and use of spectacles after routine cataract surgery. METHODS: The study included 1329 patients who underwent bilateral surgery with the second eye operated during March 2013 at 38 different clinics in Sweden. Five months after the second-eye surgery, patients completed a five-item questionnaire about their spectacle use preoperatively and postoperatively. The responses were linked to data from the registry on multiple variables including postoperative refraction, age and gender...
August 31, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28845327/biocompatibility-of-intraocular-lenses
#17
REVIEW
Pelin Özyol, Erhan Özyol, Fatih Karel
The performance of an intraocular lens is determined by several factors such as the surgical technique, surgical complications, intraocular lens biomaterial and design, and host reaction to the lens. The factor indicating the biocompatibility of an intraocular lens is the behavior of inflammatory and lens epithelial cells. Hence, the biocompatibility of intraocular lens materials is assessed in terms of uveal biocompatibility, based on the inflammatory foreign-body reaction of the eye against the implant, and in terms of capsular biocompatibility, determined by the relationship of the intraocular lens with residual lens epithelial cells within the capsular bag...
August 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28837979/-causes-diagnosis-and-therapy-of-negative-dysphotopsia
#18
Martin Wenzel, Achim Langenbucher, Timo Eppig
Negative Dysphotopsia (ND) is a dark, sometimes rounded bar or shadow in the temporal visual field after uncomplicated cataract surgery that may lead to great patient discomfort. R. Olson called it "the number one troublesome complaint after uneventful cataract surgery". The origin of this phenomena remains uncertain and is discussed conversely in literature. We have found evidence that it may be caused by a slight difference in magnification caused by the new IOL compared to the old crystalline lens. This may lead to a minimal shift of the object space corresponding the blind spot and the larger central vessels so they become visible for a short time after surgery...
August 24, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28827044/incidence-and-outcomes-of-repositioning-surgery-to-correct-misalignment-of-toric-intraocular-lenses
#19
Tetsuro Oshika, Mikio Inamura, Yasushi Inoue, Tsutomu Ohashi, Toru Sugita, Yoshifumi Fujita, Kazunori Miyata, Shinichiro Nakano
PURPOSE: To analyze the incidence and appropriate timing of repositioning surgery to correct misalignment of acrylic foldable toric intraocular lenses (IOLs). DESIGN: Retrospective, multicenter case series. PARTICIPANTS: Patients who had undergone phacoemulsification and implantation of toric IOL at 8 surgical sites. METHODS: Patient charts were reviewed to collect data on repositioning surgery of toric IOLs. MAIN OUTCOME MEASURES: Incidence, timing, and outcomes of repositioning surgery...
August 18, 2017: Ophthalmology
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
#20
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
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