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https://www.readbyqxmd.com/read/28622316/corneal-densitometry-after-photorefractive-keratectomy-laser-assisted-in-situ-keratomileusis-and-small-incision-lenticule-extraction
#1
F Poyales, N Garzón, J Mendicute, I Illarramendi, P Caro, O Jáñez, F Argüeso, A López
PurposeThe aim of this study was to gain greater insight into the corneal densitometry changes occurring as a result of refractive surgery and to compare these changes across three widely used surgical techniques, namely, photorefractive keratectomy (PRK), laser-assisted in situ keratomileusis with a femtosecond laser (LASIK-FS), or ReLEx small-incision lenticule extraction (ReLEx SMILE).Patients and methodsThree hundred and thirty-six patients (184 male and 152 female patients) participated in this study. They were split into three groups according to the refractive surgery technique they had undergone: LASIK-FS (74 patients), PRK (153 patients), and ReLEx SMILE (109 patients)...
June 16, 2017: Eye
https://www.readbyqxmd.com/read/28620708/validation-of-fourier-analysis-of-videokeratographic-data
#2
Haris Sideroudi, Georgios Labiris, Fienke Ditzel, Efi Tsaragli, Kimonas Georgatzoglou, Haralampos Siganos, Vassilios Kozobolis
PURPOSE: The aim was to assess the repeatability of Fourier transfom analysis of videokeratographic data using Pentacam in normal (CG), keratoconic (KC) and post-CXL (CXL) corneas. METHODS: This was a prospective, clinic-based, observational study. One randomly selected eye from all study participants was included in the analysis: 62 normal eyes (CG group), 33 keratoconus eyes (KC group), while 34 eyes, which had already received CXL treatment, formed the CXL group...
June 15, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28617726/comparative-analysis-of-peripheral-corneal-geometry-in-health-and-keratoconus
#3
Enric Mas-Aixala, Joan Gispets, Núria Lupón, Genís Cardona
OBJECTIVES: To describe and compare corneal peripheral angles in normal and keratoconic eyes, to gain a better understanding of the topography of the periphery of the cornea in keratoconus and assist practitioners in the selection and fitting of large diameter contact lenses. METHODS: Eighty-eight eyes were included in the study, divided into three groups: healthy (A0, 28 eyes), keratoconus at stage I according to the Amsler-Krumeich classification (AI, 33 eyes) and keratoconus at stages II to IV (AII, 27 eyes)...
June 14, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28597601/endothelial-alterations-in-712-keratoconus-patients
#4
Susanne Goebels, Timo Eppig, Berthold Seitz, Nòra Szentmàry, Alan Cayless, Achim Langenbucher
PURPOSE: To investigate the effect of the severity of keratoconus on the corneal endothelium using specular microscopy. METHODS: Seven hundred and twelve eyes from the Homburg Keratoconus Center (HKC) database were included in this retrospective study. Corneal endothelium was evaluated using the Tomey EM-3000 specular microscope. Keratoconus-related topographic and tomographic data were obtained from Scheimpflug-based tomography (Oculus Pentacam(®) HR). Eyes were classified into stages 0 (healthy) to 4 (severe keratoconus) according to the Topographic Keratoconus Classification (TKC)...
June 9, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28588646/the-effects-of-tolterodine-on-anterior-segment-and-choroidal-thickness-in-patients-with-overactive-bladder-syndrome
#5
Hande Hüsniye Telek, Omer Gokhan Doluoglu, Ayse Burcu, Gulizar Demirok, Firdevs Ornek, Ali Ayyildiz
BACKGROUND: To evaluate the effects of tolterodine on anterior segment and choroidal thickness by using the Pentacam system and optical coherence tomography (OCT) (Pentacam). METHODS: A total of 122 eyes of 61 patients (34 female; 27 male) were included in the study. All patients underwent a regular ocular examination and intraocular pressure measurements before and after 3 months of antimuscarinic drug tolterodine treatment, in addition, pupil diameter, anterior chamber depth, anterior chamber volume, anterior chamber angle, and lens thickness were measured through Pentacam (Oculus Inc...
October 2017: Therapeutic Advances in Urology
https://www.readbyqxmd.com/read/28586501/biomechanical-characterization-of-subclinical-keratoconus-without-topographic-or-tomographic-abnormalities
#6
Riccardo Vinciguerra, Renato Ambrósio, Cynthia J Roberts, Claudio Azzolini, Paolo Vinciguerra
PURPOSE: To present a case series of patients with subclinical keratoconus with normal topometric (anterior curvature) and tomographic findings in one eye who showed abnormalities detected by Corvis ST (Oculus Optikgeräte GmbH, Wetzlar, Germany) in vivo biomechanical assessment. METHODS: All patients had a complete ophthalmic examination, including the Corvis ST biomechanical measurements, optical tomography, and pachymetry with Pentacam (Oculus Optikgeräte GmbH), and Placido-based topography with either the Nidek (OPD III Nidek, Gamagori, Japan) or CSO platform (Costruzione Strumenti Oftalmici, Florence, Italy)...
June 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28564701/the-impact-of-lens-opacity-on-sd-oct-retinal-nerve-fiber-layer-and-bruch-s-membrane-opening-measurements-using-the-anatomical-positioning-system-aps
#7
Matthias M Mauschitz, Felix Roth, Frank G Holz, Monique M B Breteler, Robert P Finger
Purpose: To evaluate the impact of lens opacity on retinal nerve fiber layer thickness (RNFLT) and Bruch's membrane opening (BMO) measurements. Methods: Fifty-nine randomly selected patients without any other relevant ocular pathology undergoing elective routine cataract surgery in two specialized eye clinics were enrolled. RNFLT, BMO area, and BMO minimum rim width (BMO-MRW) were assessed with the Heidelberg Engineering Spectralis OCT using the anatomical positioning system (APS) prior to and 1 day after cataract surgery using a ring scan at different eccentricities of the disc (3...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28559422/comparison-of-corneal-dynamic-parameters-and-tomographic-measurements-using-scheimpflug-imaging-in-keratoconus
#8
Tommy Cy Chan, Yu Meng Wang, Marco Yu, Vishal Jhanji
AIM: To compare the diagnostic ability of corneal tomography and corneal dynamic response measurements in normal and keratoconus eyes. METHODS: Consecutive patients with grade II-III keratoconus and age-matched normal subjects were recruited. Corneal imaging was performed using Pentacam (Oculus Optikgeräte, Wetzlar, Germany) and Corvis (Oculus Optikgeräte). A beta version of Corvis software was used with three additional parameters: maximal change of arc length, deformation amplitude (DA) ratio 1 and DA ratio 2...
May 30, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28553547/changes-in-anterior-posterior-and-total-corneal-astigmatism-after-descemet-membrane-endothelial-keratoplasty
#9
Maged Alnawaiseh, Lars Zumhagen, André Rosentreter, Nicole Eter
Purpose. To evaluate changes in anterior, posterior, and total corneal astigmatism in patients after Descemet membrane endothelial keratoplasty (DMEK). Methods. We retrospectively included 29 eyes of 23 patients (age 67.6 ± 9.8 years, 13 female, 10 male) after DMEK surgery. The magnitude and axis orientation of anterior, posterior, and total corneal astigmatism before and after DMEK were determined using a rotating Scheimpflug system (Pentacam HR, Oculus). Results. The magnitude of anterior, posterior, and total corneal astigmatism in the central cornea did not change significantly after surgery...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28550347/correlation-between-different-scheimpflug-based-lens-densitometry-analysis-and-effective-phacoemulsification-time-in-mild-nuclear-cataracts
#10
Fernando Faria-Correia, Bernardo Lopes, Tiago Monteiro, Nuno Franqueira, Renato Ambrósio
PURPOSE: To assess the correlations between preoperative Scheimpflug-based lens densitometry and effective phacoemulsification time (EPT) in age-related nuclear cataracts. DESIGN: Retrospective consecutive study. METHODS: The setting was the Ophthalmology Department, Hospital de Braga, Portugal. The study population included 50 eyes (42 patients) with age-related nuclear cataracts submitted to uneventful phacoemulsification surgery. Different analysis methods of Scheimpflug-based lens densitometry were performed: Pentacam Nucleus Staging (PNS) score with an ordinal scale from 0 to 5 and three-dimensional (3D), linear and region of interest (ROI) methods, which are displayed on an absolute scale (from 0 to 100%)...
May 26, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28549845/tomographic-analysis-of-anterior-posterior-and-total-corneal-refractive-power-changes-after-femtosecond-laser-assisted-keratotomy
#11
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/28545414/the-observation-during-small-incision-lenticule-extraction-for-myopia-with-corneal-opacity
#12
Shaowei Zhang, Haipeng Xu, Ke Zheng, Jing Zhao, Weijun Jian, Meiyan Li, Xingtao Zhou
BACKGROUND: To evaluate the feasibility and efficacy of small incision lenticule extraction (SMILE) in the treatment of myopia with corneal opacity. METHODS: To evaluate the treatment of myopia with corneal opacity, 9 patients (4 males, 5 females) who underwent SMILE were enrolled in this prospective clinical study. One eye of each patient was treated. The results of laser scanning and lenticule extraction were observed during the surgery, and the surgical videos were again reviewed after surgery...
May 25, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28532938/posterior-corneal-shape-comparison-of-height-data-from-3-corneal-topographers
#13
Tim de Jong, Matthew T Sheehan, Steven A Koopmans, Nomdo M Jansonius
PURPOSE: To compare the ability of 3 clinical corneal topographers to describe the posterior corneal shape. SETTING: University Medical Center Groningen, the Netherlands. DESIGN: Prospective observational study. METHODS: Corneas of healthy participants were measured twice with a dual Scheimpflug instrument (Galilei G2), a scanning-slit system (Orbscan IIz), and a single Scheimpflug instrument (Pentacam HR). Height data describing the posterior corneal shape were fit with Zernike polynomials...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28528120/objective-evaluation-of-corneal-and-lens-clarity-in-children-with-type-1-diabetes-mellitus
#14
Kemal Tekin, Merve Inanc, Erdal Kurnaz, Elvan Bayramoglu, Emre Aydemir, Mustafa Koc, Zehra Aycan
PURPOSE: To investigate whether abnormal glucose metabolism and duration of diabetes mellitus (DM) affected the corneal and lens clarity in children with well-controlled type 1 DM and to compare the results obtained with those in healthy children. DESIGN: Cross-sectional prospective study. METHODS: This multicenter study enrolled 56 patients with DM and 51 control subjects. The duration of DM and the glycosylated hemoglobin (HbA1c) levels of the patients in the DM group were recorded...
May 17, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28513495/effect-of-post-crosslinking-haze-on-the-repeatability-of-scheimpflug-based-and-slit-scanning-imaging-devices
#15
Rohit Shetty, Aarti Agrawal, Rashmi Deshmukh, Luci Kaweri, Harsha L Rao, Harsha Nagaraja, Chaitra Jayadev
PURPOSE: The aim of this study was to analyze the effect of postcollagen crosslinking (CXL) haze on the measurement and repeatability of pachymetry and mean keratometry (Km) of four corneal topographers. MATERIALS AND METHODS: Sixty eyes of sixty patients with progressive keratoconus who had undergone accelerated CXL (ACXL) underwent imaging with a scanning slit imaging device (Orbscan II) and three Scheimpflug imaging devices (Pentacam HR, Sirius, and Galilei)...
April 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28513492/repeatability-and-agreement-of-five-imaging-systems-for-measuring-anterior-segment-parameters-in-healthy-eyes
#16
Mukesh Kumar, Rohit Shetty, Chaitra Jayadev, Harsha L Rao, Debarun Dutta
PURPOSE: The purpose of this study is to assess the repeatability and agreement of five imaging devices, namely, the Pentacam (Oculus), Sirius (CSO), Orbscan IIz (Bausch and Lomb), Corvis (Oculus), and ultrasound pachymetry (UP, Tomey) in measuring steep keratometry (sKm), flat keratometry (fKm), central corneal thickness (CCT), thinnest corneal thickness (TCT), and anterior chamber depth (ACD) in healthy individuals. DESIGN: This was prospective, comparative study...
April 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28503438/comparison-of-visual-effects-of-fs-lasik-for-myopia-centered-on-the-coaxially-sighted-corneal-light-reflex-or-the-line-of-sight
#17
Jing Zhang, Shi-Sheng Zhang, Qin Yu, Jing-Cai Lian
AIM: To compare visual quality after femtosecond laser in situ keratomileusis (FS-LASIK), between the coaxially sighted corneal light reflex (CSCLR) group and conventional ablation line of sight (LOS) group. METHODS: In total, 243 eyes (122 patients) were treated with centration on the CSCLR (visual axis) and 238 eyes (119 patients) treated with centration on the pupil center (LOS). Postoperative outcomes [uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA)], safety index, efficacy index, refractive outcome, ablation center distance from the visual axis, corneal high-order aberrations, subjective discomfort glare and shadowing incidence rate, and contrast sensitivity at 1, 3, and 6mo were measured and compared...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28501441/repeatability-of-topographic-corneal-thickness-in-keratoconus-comparing-visante%C3%A2-oct-and-oculus-pentacam-hr-%C3%A2-topographer
#18
Heinz Otchere, Luigina Sorbara
PURPOSE: To assess the repeatability and reproducibility of Visante™ OCT and Oculus Pentacam HR® in measuring central (CCT) and topographic corneal thickness (TCT) along the principle meridians in keratoconus (KC) corneae. METHOD: Twenty participants diagnosed with KC were recruited. There were two study visits. On the first study visit, two repeated corneal thickness measurements were obtained with each instrument. Measurements were repeated at least 48hrs later in the same order...
May 10, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28497619/change-in-over-refraction-after-scleral-lens-settling-on-average-corneas
#19
Chelsea Bray, Stephanie Britton, Debby Yeung, Lacey Haines, Luigina Sorbara
PURPOSE: The purpose of this study was to determine the change in over-refraction, if any, after a scleral lens settled on the eye for 6-8 h. METHODS: Sixteen patients of varying refractive errors and normal corneal curvatures (measured with Pentacam(™) Oculus) were fitted with trial Mini-Scleral Design (MSD) scleral lenses (15.8 mm diameter) in one eye. The sagittal depths of the scleral lenses were selected by adding 350 μm to the corneal sagittal heights measured at a chord length of 15 mm with the Visante(™) optical coherence tomographer (OCT) anterior segment scans and picking the closest available trial lens in the set...
May 12, 2017: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/28486724/noncontact-quantification-of-topography-of-anterior-corneal-surface-and-bowman-s-layer-with-high-speed-oct
#20
Himanshu Matalia, Mathew Francis, Tarun Gangil, Rachana S Chandapura, Mathew Kurian, Rohit Shetty, Everette Jacob Remington Nelson, Abhijit Sinha Roy
PURPOSE: To quantify keratometry and wavefront aberration of the anterior corneal surface and epithelium-Bowman's layer interface using anterior segment optical coherence tomography (OCT). METHODS: Twenty-five normal eyes and 25 eyes with keratoconus were retrospectively analyzed. The anterior corneal edge and epithelium-Bowman's layer interface were segmented from 12 distortion-corrected OCT B-scans. Axial tangential curvatures and wavefront aberration were calculated by ray tracing and 6th order Zernike analyses...
May 1, 2017: Journal of Refractive Surgery
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