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Refractive surgery

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https://www.readbyqxmd.com/read/28810283/-comparison-of-discriminant-analysis-and-decision-trees-for-the-detection-of-subclinical-keratoconus
#1
Sonja Kleinhans, Eva Herrmann, Thomas Kohnen, Jens Bühren
Background Iatrogenic keratectasia is one of the most dreaded complications of refractive surgery. In most cases, keratectasia develops after refractive surgery of eyes suffering from subclinical stages of keratoconus with few or no signs. Unfortunately, there has been no reliable procedure for the early detection of keratoconus. In this study, we used binary decision trees (recursive partitioning) to assess their suitability for discrimination between normal eyes and eyes with subclinical keratoconus. Patients and Methods The method of decision tree analysis was compared with discriminant analysis which has shown good results in previous studies...
August 15, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28808774/-refractive-lenticule-extraction-the-relex-smile-technique-video-article
#2
REVIEW
M Blum, W Sekundo
Refractive lenticule extraction (ReLEx/SMILE) is a refractive surgical method developed by the authors in stages primarily for correction of myopia and myopic astigmatism, in which a femtosecond laser is exclusively used. In the (ReLEx/SMILE) method a refractive lenticule is generated by the femtosecond laser, which is subsequently extracted through a small incision. Opening of the corneal surface with a flap and use of an excimer laser is no longer necessary. In 2013 the method was newly assessed and classified by the Joint Commisssion for Refractive Surgery (KRC) of the Professional Association of Ophthalmologists (BVA) and the German Ophthalmological Society (DOG)...
August 14, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
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
#3
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
https://www.readbyqxmd.com/read/28803418/clinical-results-after-microincision-biaxial-cataract-surgery-and-implantation-of-an-incise-intraocular-lens
#4
Wojciech Lubiński, Marta Kirkiewicz, Karolina Podborączyńska-Jodko
PURPOSE: To evaluate clinical outcomes after uncomplicated microincision biaxial cataract surgery and implantation of Incise intraocular lens (IOL). METHODS: This study included 47 eyes of 29 patients (mean age 62.2 ± 8.6 years), who underwent 1.4-mm biaxial cataract surgery with implantation of the Incise IOL (Bausch and Lomb). At third month, surgically induced astigmatism (SIA) was calculated. Three, 6 and 12 months postoperatively, uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), corrected near visual acuity (CNVA) LogMAR ETDRS, spherical equivalent refraction (SER), photopic distance corrected contrast sensitivity (CS) with and without glare (85 cd/m(2)) (CSV-1000) were assessed...
August 12, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28801741/scleral-suture-fixation-technique-for-dislocated-plate-haptic-toric-iol
#5
Remzi Karadag, Bahar Gunes, Veysel Aykut, Halit Oguz, Ahmet Demirok
Purpose We describe a scleral suture fixation technique for dislocated plate haptic toric intraocular lens (IOL) implantation. Materials and methods A double-armed 10-0 straight polypropylene suture was passed into the eye from the sclera (2 mm away from the limbus). A suture needle was passed through the hole on the corner of the IOL and pulled out from the paracentesis with a 27-gauge needle. Afterward, the suture needle was reinserted from the same paracentesis and then removed from the eye with the help of a 27-gauge needle entering the eye from a nearby point to the first scleral entrance...
August 11, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28800655/-further-development-of-modern-refractive-lens-surgery
#6
Thomas Kohnen
No abstract text is available yet for this article.
August 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28797099/prevalence-of-visual-impairment-and-outcomes-of-cataract-surgery-in-chaonan-south-china
#7
Xiujuan Zhang, Emmy Y Li, Christopher Kai-Shun Leung, David C Musch, Xin Tang, Chongren Zheng, Mingguang He, David F Chang, Dennis Shun-Chiu Lam
PURPOSE: To estimate the prevalence and causes of blindness and visual impairment (VI), and report the outcomes of cataract surgery in Chaonan Region, Guangdong Province, southern China. DESIGN: Cross-sectional population-based survey. PARTICIPANTS: A total of 3484 participants including 1397 men (40.1%) and 2087 women (59.9%) aged ≥50 years were examined (94.2% response rate). METHOD: A two-stage cluster sampling procedure was used to select 3700 participants aged ≥50 years from 74 clusters of Chaonan Region...
2017: PloS One
https://www.readbyqxmd.com/read/28791058/stereoacuity-after-wavefront-guided-photorefractive-keratectomy-in-anisometropia
#8
Farid Karimian, Vahid Ownagh, Mohammad Aghazadeh Amiri, Seyed Mehdi Tabatabaee, Nooshin Dadbin
PURPOSE: To determine changes in stereoacuity in anisometropic myopic eyes after photorefractive keratectomy (PRK). METHODS: Myopic patients with at least 1 diopter (D) of anisometropia in sphere, astigmatism, or spherical equivalent who were referred to our hospital for excimer refractive surgery were enrolled as a prospective sequential interventional case series. All patients underwent wavefront-guided photorefractive keratectomy (WFG-PRK) using the Technolas Perfect Vision (217z) Excimer laser machine...
July 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28791057/evaluation-of-changes-in-visual-acuity-contrast-sensitivity-and-aberrations-in-patients-with-keratoconus-after-corneal-collagen-cross-linking
#9
Siamak Zarei-Ghanavati, Hamid Khakshour, Mohammadreza Vejdani, Haleh Ghooshkhanei, Amirhosein Vejdani
PURPOSE: To assess and compare preoperative refractive, aberrometric, topographic, and contrast sensitivity (CS) measurements with postoperative values after corneal collagen cross-linking (CXL) in patients with progressive keratoconus. METHODS: Twenty-two eyes of 11 patients with keratoconus were enrolled in this prospective study. Uncorrected distance visual acuity (UDVA), best spectacle corrected visual acuity (BSCVA), CS, and higher order aberrations (HOAs) were evaluated at baseline and 1, 3, 6, and 8 months after surgery...
July 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28791056/accuracy-of-different-topographic-instruments-in-calculating-corneal-power-after-myopic-photorefractive-keratectomy
#10
Alireza Baradaran-Rafii, Sahba Fekri, Mohammad Rezaie, Shahram Salehi-Rad, Ali Moradi, Tahmineh Motevasseli, Masumeh Kalantarion
PURPOSE: To compare the corneal power measurements obtained using different topographic instruments after myopic photorefractive keratectomy (PRK). METHODS: Patients with myopia who were candidates for corneal refractive surgery were sequentially included. Pre-PRK and six months post-PRK corneal powers were measured using Javal manual keratometer, Orbscan II, Galilei, Tomey TMS4, and EyeSys 2000 topographers. Measured values were compared with those obtained using the clinical history method (CHM)...
July 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28780781/multifocal-intraocular-lenses-and-extended-depth-of-focus-intraocular-lenses
#11
Detlev R H Breyer, Hakan Kaymak, Timon Ax, Florian T A Kretz, Gerd U Auffarth, Philipp R Hagen
Presbyopia and cataract patients' desire for increased spectacle independence after surgery is one of the main drivers for the development of multifocal intraocular lenses (MIOLs) and extended depth of focus (EDOF) intraocular lenses (IOLs). As education, biometry, diagnostics, surgical techniques, and MIOL/EDOF IOL designs have improved over the past decade, an increasing number of cataract surgeons have become cataract-refractive surgeons to help address this need. There is not 1 single MIOL/EDOF IOL, however, that suits all patients' needs...
July 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28780776/intraocular-lens-power-calculation-in-eyes-after-laser-in-situ-keratomileusis-or-photorefractive-keratectomy-for-myopia
#12
Adi Abulafia, Warren E Hill, Li Wang, Olga Reitblat, Douglas D Koch
Intraocular power calculation is challenging for patients who have previously undergone corneal refractive surgery. The sources of prediction errors for these eyes are well known; however, the numerous formulas and methods available for calculating intraocular lens power in these cases are eloquent testimony to the absence of a definitive solution. This review discusses some of the available methods for improving the accuracy for predicting the refractive outcome for these patients. It focuses mainly on the methods available on the American Society of Cataract and Refractive Surgery (ASCRS) online calculator and provides some practical guidelines for cataract surgeons who encounter these challenging cases...
July 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28778114/comparison-of-hill-rbf-barrett-universal-and-current-third-generation-formulas-for-the-calculation-of-intraocular-lens-power-during-cataract-surgery
#13
Timothy V Roberts, Chris Hodge, Gerard Sutton, Michael Lawless
IMPORTANCE: This study represents a novel comparison of recently introduced intraocular lens (IOL) power calculation formulas. BACKGROUND: To compare current new generation formulas for calculating the IOL power for a standard cohort of patients undergoing cataract and lens replacement surgery in a private group practice in Australia. DESIGN: Retrospective case series comparison. PARTICIPANTS: Postoperative results from 400 consecutive patients undergoing implantation of an SN60WF IOL post cataract removal by 12 surgeons were used...
August 4, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28777776/immunologic-rejection-episodes-after-deep-anterior-lamellar-keratoplasty-incidence-and-risk-factors
#14
Andres Gonzalez, Marianne O Price, Matthew T Feng, Christopher Lee, Juan G Arbelaez, Francis W Price
PURPOSE: To assess the rejection episode rate after deep anterior lamellar keratoplasty (DALK) and to identify associated risk factors. METHODS: This retrospective review of 251 primary DALK procedures performed by 14 surgeons at a single center between February 2008 and November 2015 evaluated the rejection episode rate and associated risk factors using Kaplan-Meier survival and proportional hazards analyses, which took the length of follow-up into consideration...
September 2017: Cornea
https://www.readbyqxmd.com/read/28777775/induced-de-novo-astigmatism-after-hyperopic-lasik-versus-myopic-lasik-surgery-in-nonastigmatic-eyes
#15
Lily Karmona, Michael Mimouni, Igor Vainer, Tzahi Sela, Gur Munzer, Igor Kaiserman
PURPOSE: To compare the astigmatism induced surgically (SIA) by spherical hyperopic laser in situ keratomileusis (H-LASIK) versus myopic laser in situ keratomileusis (M-LASIK) in nonastigmatic eyes. METHODS: A retrospective study of patients who underwent LASIK surgery between 2005 and 2014 at the Care-Vision Laser Center, Israel. We calculated the mean absolute SIA and performed risk factor analysis for induced astigmatism. Differences between H-LASIK and M-LASIK were analyzed...
September 2017: Cornea
https://www.readbyqxmd.com/read/28774937/clinical-outcomes-after-implantation-of-a-toric-intraocular-lens-with-a-transitional-conic-toric-surface
#16
Bettina C Thomas, Ramin Khoramnia, Gerd U Auffarth, Mike P Holzer
PURPOSE: To evaluate the postoperative outcomes after implantation of a hydrophilic toric intraocular lens (tIOL) with a transitional conic toric surface in patients with astigmatism undergoing refractive lens exchange (RLE) or cataract surgery. METHODS: In this monocentric study, clinical outcomes following implantation of the hydrophilic Precizon toric IOL model 565 (Ophtec) were analysed. For intraoperative axis alignment, the Verion Image Guided System was used...
August 3, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28774512/impact-of-lens-densitometry-on-phacoemulsification-parameters-and-usage-of-ultrasound-energy-in-femtosecond-laser-assisted-lens-surgery
#17
Ghada Al-Khateeb, Mehdi Shajari, Krishnapoojita Vunnava, Kerstin Petermann, Thomas Kohnen
OBJECTIVE: The aim of this study was to find the correlation between lens densitometry measurements using Pentacam Scheimpflug imaging system with equivalent average ultrasound power and cumulative dissipated energy (CDE) in femtosecond laser-assisted lens surgery (FLALS). METHODS: One hundred and twenty-four eyes were analyzed retrospectively, of which 109 had undergone cataract surgery and 15 had received refractive lens exchange with FLALS. Using the Pentacam Nucleus Staging (PNS) lens densitometry program, preoperative mean lens density and cataract grading score were evaluated...
August 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28770106/outcome-of-surgical-treatment-in-late-onset-capsular-block-syndrome
#18
Yang Huang, Zi Ye, Hang Li, Zhaohui Li
PURPOSE: To further investigate the pathogenesis of late-onset capsular block syndrome (CBS) and to evaluate the safety of surgical treatment. METHODS: Seven patients diagnosed with late-onset CBS were retrospectively analyzed. Anterior chamber depth (ACD), intraocular pressure (IOP), refractive diopter, and best-corrected visual acuity (BCVA) before and after surgery were recorded. The opaque substance was tested with Western blot, and a flow cytometer multiple array assay system was utilized to evaluate the levels of inflammatory cytokines from opaque substance and aqueous humor, respectively...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28757690/prognostic-preoperative-factors-for-successful-outcome-of-surgery-in-horizontal-strabismus
#19
Namita Kumari, Abadan Khan Amitava, Mohammad Ashraf, Shivani Grover, Ashiya Khan, Prabha Sonwani
CONTEXT: Surgery for horizontal strabismus reportedly has a success rate of 60%-80%. However, which preoperative factors are predictive of this success is not clear. AIMS: To identify prognostic factors those are predictive of successful outcome in horizontal strabismus surgery. SETTINGS AND DESIGN: Observational analytical study using multiple logistic regression (MLR). SUBJECTS AND METHODS: We assessed the medical records of patients who had undergone first-time horizontal muscle strabismus surgery between 2002 and 2013, where complete follow-up data were available for ≥6 weeks, and also, we collected data prospectively on patients operated between January 2014 and September 2015...
May 2017: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/28753216/strabismus-after-ocular-surgery
#20
Ethan K Sobol, Jamie B Rosenberg
Many types of ocular surgery can cause diplopia, including eyelid, conjunctival, cataract, refractive, glaucoma, retinal, and orbital surgery. Mechanisms include direct injury to the extraocular muscles from surgery or anesthesia, scarring of the muscle complex and/or conjunctiva, alteration of the muscle pulley system, mass effects from implants, and muscle displacement. Diplopia can also result from a loss of fusion secondary to long-standing poor vision in one eye or from a decompensation of preexisting strabismus that was not recognized preoperatively...
July 28, 2017: Journal of Pediatric Ophthalmology and Strabismus
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