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corneal refraction

Jorge L Alió, Jorge L Alió Del Barrio, Mona El Zarif, Albert Azaar, Nehman Makdissy, Charbel Khalil, Walid Harb, Ibrahim El Achkar, Ziad Abdul Jawad, María P de Miguel
PURPOSE: To evaluate the one-year safety and efficacy of the cellular therapy of the corneal stroma by implanting autologous adipose derived adult stem cells (ADASc) with or without sheets of decellularized donor human corneal stroma within the stroma of patients with advanced keratoconus. METHODS: Prospective interventional non-randomized series of cases. Fourteen consecutive patients were selected and distributed into 3 experimental groups: A) Implantation of autologous ADASc alone (3x 106 /1mL ) (n:5); B) Decellularized donor 120 μm thick corneal stroma lamina alone (n:5); C) Recellularized donor lamina with 1x106 autologous ADASc+ another 1x106 /1mL cells at the time of the surgery (n:4)...
February 14, 2019: American Journal of Ophthalmology
Vittoria Ravera, Cristina Bovone, Vincenzo Scorcia, Sergio DʼAngelo, Massimo Busin
PURPOSE: To evaluate the possibility of using the intrastromal corneal ring segments (ICRSs) previously implanted as a depth reference for performing pneumatic dissection in deep anterior lamellar keratoplasty (DALK). METHODS: The depth of placement of 2 symmetrical ICRSs placed in the superior and inferior midperipheral cornea of 4 eyes of 4 patients with keratoconus was measured by means of anterior segment optical coherence tomography. Because of irregular and/or high astigmatism, DALK using pneumatic dissection was performed in all eyes...
February 12, 2019: Cornea
Magdalena Jędzierowska, Robert Koprowski
BACKGROUND: Non-contact tonometers based on the method using air puff and Scheimpflug's fast camera are one of the latest devices allowing the measurement of intraocular pressure and additional biomechanical parameters of the cornea. Biomechanical features significantly affect changes in intraocular pressure values, as well as their changes, may indicate the possibility of corneal ectasia. This work presents the latest and already known biomechanical parameters available in the new offered software...
February 13, 2019: Biomedical Engineering Online
Yu Jeong Kim, Won Ryang Wee, Mee Kum Kim
PURPOSE: To determine the efficacy of 4-haptic bitoric intraocular lens (IOL) implantation in Asian patients with cataract and astigmatism. METHODS: A total of 19 eyes with ≤25.0 mm axial length and ≥0.75 diopters (D) corneal astigmatism were included in this prospective non-comparative study. All subjects underwent phacoemulsification with implantation of an AT Torbi 709M IOL. Visual and refractive outcomes as well as toric IOL axis were evaluated during a 3-month follow-up...
February 2019: Korean Journal of Ophthalmology: KJO
Eloy A Villegas, Silvestre Manzanera, Carmen M Lago, Lucía Hervella, Lucie Sawides, Pablo Artal
PURPOSE: To evaluate the impact of the lens aberrations on the adaptive optics visual simulation of pseudophakic intraocular lens (IOL) profiles. METHODS: In 20 right phakic eyes, lens higher order aberrations (HOAs) were calculated as the whole eye minus the corneal aberrations. Visual simulation using low and high contrast corrected distance visual acuity (CDVA) testing was carried out with the VAO instrument (Voptica, SL, Murcia, Spain), considering three optical conditions of the lens: removing HOA (no lens-HOA), removing spherical aberration (no lens-SA), and with lens HOA (natural condition)...
February 1, 2019: Journal of Refractive Surgery
Renata L B Moraes, Ramon C Ghanem, Vinicius C Ghanem, Marcony R Santhiago
PURPOSE: To investigate the results after photorefractive keratectomy (PRK) followed immediately by standard 30-minute corneal cross-linking (CXL) for keratoconus. METHODS: This retrospective study included 26 eyes of 16 patients with keratoconus. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction spherical equivalent (SE) and cylinder, apical keratometry, corneal higher order aberrations (HOAs), and corneal haze were evaluated...
February 1, 2019: Journal of Refractive Surgery
Limin Fan, Lu Xiong, Bo Zhang, Zheng Wang
PURPOSE: To observe the epithelial remodeling over a 9-mm diameter cornea induced by topography-guided femtosecond laser-assisted in situ keratomileusis (FS-LASIK) for myopia correction using spectral-domain optical coherence tomography (SD-OCT). METHODS: Forty-three eyes of 22 patients who underwent topography-guided FS-LASIK for myopic correction were included. The "Pachymetrywide" scan pattern was used to generate the epithelial thickness map using SD-OCT preoperatively and 1, 3, and 6 months postoperatively...
February 1, 2019: Journal of Refractive Surgery
Avi Wallerstein, Marilou Caron-Cantin, Mathieu Gauvin, Eser Adiguzel, Mark Cohen
PURPOSE: To evaluate the outcomes of primary topography-guided laser in situ keratomileusis (LASIK) in eyes with subjective refractive astigmatism of 2.00 diopters (D) or greater. METHODS: This was a prospective study in consecutive eyes with cylinder of 2.00 D or greater that had LASIK using the Alcon WaveLight EX500 excimer laser and T-CAT/Contoura software (Alcon Laboratories, Inc., Fort Worth, TX). The accuracy, efficacy, safety, cylinder vector analysis, higher order aberrations, and patients' subjective quality of vision were assessed...
February 1, 2019: Journal of Refractive Surgery
Safa El Hout, Myriam Cassagne, Thomas Sales de Gauzy, Stéphane Galiacy, François Malecaze, Pierre Fournié
PURPOSE: To compare the outcomes of transepithelial photorefractive intrastromal corneal crosslinking (CXL) and photorefractive keratectomy (PRK) in eyes with low myopia. SETTING: Purpan Hospital, Toulouse, France. DESIGN: Prospective case series. METHODS: Myopic patients with a manifest refraction spherical equivalent (MRSE) of -1.00 to -2.50 diopters (D) and a cylindrical component of plano to -0.75 D were included...
February 4, 2019: Journal of Cataract and Refractive Surgery
Vinicius S De Stefano, Caio Meister, Germano L Ehlke, Ronald R Krueger
PURPOSE: To analyze planning strategies for eyes that gained 1 or more lines of corrected distance visual acuity (CDVA) after topography-guided custom treatment (TCAT). SETTING: Refractive Surgery Clinic, Cleveland Clinic, Ohio, USA. DESIGN: Retrospective case series. METHODS: Eyes having TCAT by the same surgeon between February 2016 and June 2017 were enrolled. The corneal shape was captured with the Wavelight Allegretto Topolyzer diagnostic device coupled with refraction, generating an ablation profile...
February 4, 2019: Journal of Cataract and Refractive Surgery
Ahmed Mohamud, Jesper Erichsen, Line Kessel, Lars Holm, Michael Larsen
Presbyopia, i.e. the loss of accommodative amplitude with age, results from increasing stiffness and thickness of the lens and leads to inability of the lens to change shape, refractive power and focus of the eye in response to the contraction of the ciliary muscle inside the eye. Multiple remedies are available, the most common being reading glasses. Alternative options include a monovision combination of monofocal lenses or the use of multifocal lenses, in the form of contact lenses or intraocular implant lenses, corneal implants or corneal refractive surgery...
January 28, 2019: Ugeskrift for Laeger
A Amorim-de-Sousa, R Macedo-de-Araújo, P Fernandes, A Queirós, J M González-Méijome
Purpose: To evaluate the impact of different levels of positive and negative defocus on light disturbance (LD) measures and to understand how high-order aberrations (HOAs) and topographic quality parameters may influence the perception of photic phenomena. Methods: Thirty young healthy subjects (21 females and 9 males) attended this cross-sectional study. LD was evaluated with the light distortion analyzer (LDA) in natural accommodative and cycloplegic conditions with positive and negative induced defocus of 1...
2019: Journal of Ophthalmology
G Carracedo, T M Espinosa-Vidal, I Martínez-Alberquilla, L Batres
Purpose: To evaluate the effect of the optical zone diameter (OZ) in orthokeratology contact lenses regarding the topographical profile in patients with high myopia (-4.00 D to -7.00 D) and to study its effect over the visual quality. Materials and Methods: Twelve patients (18 eyes) were fitted with overnight orthokeratology (OrthoK) with a randomized 6 mm or 5 mm OZ lens worn for 2 weeks, followed by a 2-week washout period, between both designs. Keratometry (K) readings, optical zone treatment diameter (OZT), peripheral ring width (PRW), higher-order aberrations (HOA), high (HC) and low contrast (LC) visual acuity, and subjective vision and comfort were measured at baseline and after 2 weeks of OrthoK lens wear of each contact lens...
2019: Journal of Ophthalmology
Mukharram M Bikbov, Gyulli M Kazakbaeva, Timur R Gilmanshin, Rinat M Zainullin, Inga I Arslangareeva, Venera F Salavatova, Guzel M Bikbova, Songhomitra Panda-Jonas, Nikolai A Nikitin, Artur F Zaynetdinov, Ildar F Nuriev, Renat I Khikmatullin, Yulia V Uzianbaeva, Dilya F Yakupova, Said K Aminev, Jost B Jonas
PURPOSE: To assess the normal distribution of axial length and its associations in a population of Russia. METHODS: The population-based Ural Eye and Medical Study included 5,899 (80.5%) individuals out of 7328 eligible individuals aged 40+ years. The participants underwent an ocular and systemic examination. Axial length was measured sonographically (Ultra-compact A/B/P ultrasound system, Quantel Medical, Cournon d'Auvergne, France). RESULTS: Biometric data were available for 5707 (96...
2019: PloS One
Darren Shu Jeng Ting, Saurabh Ghosh
OBJECTIVES: To highlight the clinical characteristics, and visual and corneal tomographic outcomes of central toxic keratopathy (CTK) after contact lens (CL) wear and mechanical debridement. METHODS: A retrospective observational case series with literature review. RESULTS: Four patients (4 eyes) were included in this study; 3 (75%) females, mean age 29.3±8.1 years. The mean follow-up was 13.5±7.5 months. Early central or paracentral stromal opacification, assuming an inverse dome-shaped pattern observed under anterior-segment optical coherence tomography, with corneal flattening (Kmean 40...
January 29, 2019: Eye & Contact Lens
Yin Hu, Canhong Wen, Zhouyue Li, Wenchen Zhao, Xiaohu Ding, Xiao Yang
BACKGROUND: The myopia control effect of orthokeratology (OK) varies among individuals. The variation might relate to the proposed 'areal summation effect' of lens-induced visual signals. The current study evaluated the areal summed corneal power shift (ASCPS) in myopic children treated with OK lenses and assessed whether the ASCPS achieved at early post-OK visit can predict the lens long-term effect on the axial length (AL) elongation. METHODS: Study participants were 130 myopic children treated with OK lenses (age range, 8 to 15 years) in a prospective study...
January 31, 2019: British Journal of Ophthalmology
Olavi Pärssinen, Markku Kauppinen, Ulrich Halekoh, Jaakko Kaprio, Taina Rantanen
PURPOSE: To examine genetic influences on interocular similarities in ocular refraction and components of refraction among elderly female twins. METHODS: Refraction was assessed in 94 monozygotic (MZ) and 74 dizygotic (DZ) female twins aged 66-78 years. Absolute values of interocular differences (Aniso variables) in spherical refraction (SR), refractive astigmatism (AST), spherical equivalent (SE), corneal refractive power (CR), corneal astigmatism (CAST), anterior chamber depth (ACD) and axial length (AL) were calculated...
January 31, 2019: Acta Ophthalmologica
Sadia Humayun, Aisha Fawad, Quratulain Humayun, Sabahat Arzoo, Mazhar Ishaq
OBJECTIVE: To evaluate key corneal tomography parameters for screening refractive surgery patients in Pakistani population. STUDY DESIGN: Cross-sectional, observation study. PLACE AND DURATION OF STUDY: Armed Forces Institute of Ophthalmology AFIO, National University of Medical Sciences, Rawalpindi, Pakistan, from August 2013 to December 2016. METHODOLOGY: Myopic patients were evaluated by two separate observers on Allegro OculyzerII (Wavelight) for normal ocular examination...
February 2019: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
Stefan Nickels, Susanne Hopf, Norbert Pfeiffer, Alexander K Schuster
PURPOSE: Myopia is increasing worldwide and possibly linked to education. In this study, we analyse the association of myopia and education in the U.S. and investigate its age-dependency. METHODS: We conducted a secondary data analysis using the public use files from the cross-sectional study National Health and Nutrition Examination Survey of the period from 1999 to 2008. 19,756 participants aged 20 to 85 years were included with data on education and ophthalmic parameters (distance visual acuity, objective refraction and keratometry)...
2019: PloS One
Philip Riedl, Dragana Škiljić, Per Arnell, Roger Wannholt, Madeleine Zetterberg, Marita Andersson Grönlund
PURPOSE: To examine visual acuity, refraction and ocular status before, during and after hyperbaric oxygen therapy (HBOT). METHODS: Twenty-nine patients underwent 40 standard protocol HBOT treatments. In all subjects, refraction and best corrected visual acuity were measured at baseline and after ten, 20, 30 and 40 treatments, and at a 12-week follow-up. A subgroup (n = 19) were given additional examinations at baseline, after 40 treatments and at follow-up including measuring central corneal thickness (CCT), corneal curvature, anterior chamber depth, lens thickness, axial length, fundus morphology, blood pressure and intraocular pressure (IOP)...
January 28, 2019: Acta Ophthalmologica
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