keyword
MENU ▼
Read by QxMD icon Read
search

Pachymetry

keyword
https://www.readbyqxmd.com/read/29117416/accuracy-of-visual-estimation-of-lasik-flap-thickness
#1
Jason E Brenner, Ali Fadlallah, Kathryn M Hatch, Catherine Choi, Rony R Sayegh, Paul Kouyoumjian, Simon Wu, George T Frangieh, Samir A Melki
PURPOSE: To assess the accuracy of surgeons' visual estimation of LASIK flap thickness when created by a femtosecond laser by comparing it to ultrasound measurements. METHODS: Surgeons were asked to visually estimate the thickness of a femtosecond flap during the procedure. Total corneal thickness was measured by ultrasound pachymetry prior to the procedure and the stromal bed was similarly measured after flap lifting. The estimates from three experienced surgeons (cornea fellowship trained and more than 5 years in practice) were compared to those of three cornea fellows, with each surgeon evaluating 20 eyes (120 total)...
November 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29111598/comparison-of-corneal-thickness-measurements-using-ultrasound-pachymetry-ultrasound-biomicroscopy-and-digital-caliper-in-frozen-canine-corneas
#2
Seowoo Jeong, Seonmi Kang, Sangwan Park, Eunjin Park, Jaegook Lim, Taekjin Nam, Kangmoon Seo
OBJECTIVE: To evaluate the clinical efficacy among ultrasound pachymetry (UP), ultrasound biomicroscopy (UBM), and manual measurement (MM) with digital caliper by comparing corneal thickness (COT) values obtained from frozen canine corneas ex vivo. PROCEDURES: COT was measured using UP, UBM, and MM in eight enucleated normal canine eyes frozen at -20 °C for 4 weeks. After thawing at room temperature for 2 h, the COT values were obtained from five sites on each cornea: central corneal thickness (CCOT), thickness at the 3, 6, 9, and 12 o'clock positions (3COT, 6COT, 9COT, and 12COT, respectively)...
November 7, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/29110439/iontophoretic-collagen-cross-linking-versus-epithelium-off-collagen-cross-linking-for-early-stage-of-progressive-keratoconus-3%C3%A2-years-follow-up-study
#3
Alina Cantemir, Anisia-Iuliana Alexa, Bogdan Gabriel Galan, Nicoleta Anton, Roxana Elena Ciuntu, Ciprian Danielescu, Dorin Chiselita, Danut Costin
PURPOSE: To compare 3-year iontophoretic corneal collagen cross-linking (I-CXL) outcomes with epithelium-off corneal collagen cross-linking (epi-off CXL) for early stage of progressive keratoconus. METHODS: Eighty eyes of 80 patients with early progressive keratoconus treated by I-CXL (n = 40) or epi-off CXL (n = 40) were included in this study. Uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, corneal topography and pachymetry were assessed at baseline and at 1, 3, 6, 12, 24 and 36 months of follow-up...
November 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29090512/corneal-backward-scattering-and-higher-order-aberrations-in-children-with-vernal-keratoconjunctivitis-and-normal-topography
#4
Tommy C Y Chan, Emily S Wong, Jason C K Chan, Yumeng Wang, Marco Yu, Naoyuki Maeda, Vishal Jhanji
PURPOSE: To investigate the corneal backward scattering and higher-order aberrations (HOAs) in children with vernal keratoconjunctivitis (VKC) and normal topography. METHODS: Thirty-six eyes of 22 patients with VKC and 54 eyes of 34 normal subjects were included. All participants had clear cornea, absence of dry eyes and a normal corneal tomography. Scheimpflug imaging was used to measure corneal backward scattering in zones centred on the corneal apex (central 2-mm zone and paracentral 2- to 6-mm zone), and HOAs were compared between VKC and normal control...
November 1, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29090045/comparison-between-pentacam-hr-and-orbscan-ii-after-hyperopic-photorefractive-keratectomy
#5
Mahmoud Jabbarvand, Farshad Askarizadeh, Mohamad Reza Sedaghat, Hadi Ghadimi, Bahram Khosravi, Mohammad Aghazadeh Amiri, Foroozan Narooie-Noori
PURPOSE: The aim of this study was to determine the agreement between Pentacam HR (Scheimpflug imaging, Oculus) and Orbscan II (scanning slit topography, Bausch and Lomb) in measuring corneal parameters after photorefractive keratectomy (PRK) for hyperopia. METHODS: In this prospective cross-sectional study, 38 hyperopic eyes undergoing PRK were examined before refractive surgery and 8 to 10 months postoperatively using Pentacam HR and Orbscan II. Ultrasound (US) pachymetry was also used to measure central corneal thickness (CCT)...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29090044/temporal-and-spatial-flap-variability-in-laser-in-situ-keratomileusis-by-optical-coherence-tomography
#6
Yousif Farhan Dawood, Usama Al Hassany, Ammar F Issa
PURPOSE: To study changes in flap thickness made with two different microkeratome heads across different corneal locations using anterior segment optical coherence tomography (OCT). METHODS: In this prospective, non-randomized, consecutive case series, subjects who had their laser in-situ keratomileusis (LASIK) flaps made using 90 μm (MSU90) or 130 μm (MSU130) disposable M2 microkeratome heads were examined using OCT. The measurements were performed at three locations (central and 2...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29081866/conventional-versus-accelerated-collagen-cross-linking-for-keratoconus-a-comparison-of-visual-refractive-topographic-and-biomechanical-outcomes
#7
Jyh Haur Woo, Jayant Venkatramani Iyer, Li Lim, M Htoon Hla, Jodhbir S Mehta, Cordelia Ml Chan, Donald Th Tan
OBJECTIVE: The aim was to compare the visual, refractive, topographic and biomechanical outcomes in patients with progressive keratoconus treated with either conventional or accelerated crosslinking at one year follow up. METHODS: It is a prospective, non-randomised interventional study of 76 patients who underwent conventional (CXL; 3mW/cm(2) for 30 minutes) or accelerated cross linking (KXL; 30mW/cm(2) for 4 minutes) for progressive keratoconus. Baseline and postoperative visual acuity, manifest refraction, corneal topography, pachymetry, endothelial cell density and biomechanical parameters of corneal hysteresis and corneal resistance factor were evaluated and compared...
2017: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/29077583/phenotypic-characterization-of-corneal-endothelial-dystrophy-in-german-shorthaired-and-wirehaired-pointers-using-in-vivo-advanced-corneal-imaging-and-histopathology
#8
Olivia R Shull, Christopher M Reilly, Lola B Davis, Christopher J Murphy, Sara M Thomasy
PURPOSE: To evaluate corneal morphology using ultrasonic pachymetry (USP), Fourier-domain optical coherence tomography (FD-OCT), and in vivo confocal microscopy (IVCM) in 2 related canine breeds-German shorthaired pointers (GSHPs) and German wirehaired pointers (GWHPs)-with and without corneal endothelial dystrophy (CED). This condition is characterized by premature endothelial cell degeneration leading to concomitant corneal edema and is similar to Fuchs endothelial corneal dystrophy...
October 25, 2017: Cornea
https://www.readbyqxmd.com/read/29075941/correlation-between-central-corneal-thickness-and-myopia
#9
Michael Mimouni, Victor Flores, Yinon Shapira, Shmuel Graffi, Shmuel Levartovsky, Tzahi Sela, Gur Munzer, Igor Kaiserman
PURPOSE: To analyze the correlation between central corneal thickness (CCT) and myopia in refractive surgery candidates. MATERIALS AND METHODS: Patients that underwent myopic laser refractive surgery between January 2000 and December 2014 were included. Preoperative CCT was measured by ultrasonic pachymetry, and refractive status determined by manifest and cycloplegic refraction. RESULTS: A total of 30,245 individuals were included. Mean age was 28...
October 26, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/29053562/predictive-factors-for-corneal-clearance-after-descemetorhexis-without-endothelial-keratoplasty
#10
Emma Davies, Ula Jurkunas, Roberto Pineda
PURPOSE: To study preoperative factors that possibly contribute to corneal clearance after Descemetorhexis without endothelial keratoplasty (DWEK) and to determine the most successful surgical technique for the procedure. METHODS: Retrospective chart review of 17 eyes of 13 patients with Fuchs corneal endothelial dystrophy that underwent central 4-mm DWEK. RESULTS: Baseline age, pachymetry, and endothelial cell count were not statistically significantly different between eyes that cleared 0 to 2 months, 3 to 5 months, 6 to 8 months, or that failed to clear...
October 17, 2017: Cornea
https://www.readbyqxmd.com/read/29044716/effect-of-central-corneal-thickness-on-intraocular-pressure-and-comparison-of-topcon-ct-80-non-contact-tonometry-with-goldmann-applanation-tonometry
#11
Tarannum Mansoori, Nagalla Balakrishna
BACKGROUND: To compare intraocular pressure (IOP) measurements obtained with the Topcon CT-80 non-contact tonometer (NCT) and Goldmann applanation tonometer (GAT), in different ranges of IOP in normal and glaucoma subjects, and to assess the influence of central corneal thickness (CCT) on the IOP measurements in Asian Indian eyes. METHODS: Four hundred and two eyes of 402 subjects (193 newly diagnosed primary open angle glaucoma [POAG] and 209 normal) were enrolled for this prospective study...
October 18, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/29044058/femtosecond-laser-assisted-cataract-surgery-versus-2-2-mm-clear-corneal-phacoemulsification
#12
H Ranjini, Praveen R Murthy, Gowri J Murthy, Vinay R Murthy
PURPOSE: Phacoemulsification is the surgical procedure of choice for cataract, providing excellent visual and safety outcomes. Femtosecond laser-assisted cataract surgery (FLACS) is an addition to the surgical armamentarium. The study aims to compare the outcomes of FLACS using LenSx™ (Alcon Inc., USA) to standard 2.2 mm clear corneal phacoemulsification. Prospective case-control, comparative, interventional study was conducted in a tertiary care center. METHODS: In each group, 55 eyes of 55 patients underwent cataract surgery using either FLACS or conventional phacoemulsification (control group)...
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29022163/comparison-of-central-corneal-thickness-with-four-different-optical-devices
#13
Kuddusi Teberik, Mehmet Tahir Eski, Murat Kaya, Handan Ankaralı
BACKGROUND: To compare the consistency between the average scores of the contact central corneal thickness measurements from ultrasound pachymetry devices still gold standard, such as iPac(®) and Echoscan US-500, and noncontact measurements via Pentacam HR and Sirius topography. METHODS: This prospective study, subsequently admitted to the ophthalmology department, 76 healthy individuals were performed. The measurements were repeated three times for each eye, and average scores were statistically analyzed on the same day and almost at the same time...
October 11, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28991620/new-perspectives-on-the-detection-and-progression-of-keratoconus
#14
REVIEW
Antonio Martínez-Abad, David P Piñero
Laser refractive surgery has increased markedly in recent years, making the detection of corneal abnormalities extremely relevant. For this reason, an accurate diagnosis of clinical or subclinical keratoconus is critical. Corneal topography is the primary diagnostic tool for keratoconus detection, and pachymetry data and corneal aberrations are also commonly used. Recently, tomographic measurements using optical coherence tomography and corneal biomechanical indices have been used. In incipient and subclinical keratoconus, the use of a single parameter as a diagnostic factor is not sufficiently accurate...
September 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28986008/characterisation-of-the-porcine-eyeball-as-an-in-vitro-model-for-dry-eye
#15
Francesco Menduni, Leon N Davies, D Madrid-Costa, Antonio Fratini, James S Wolffsohn
PURPOSE: To characterise the anatomical parameters of the porcine eye for potentially using it as a laboratory model of dry eye. METHODS: Anterior chamber depth and angle, corneal curvature, shortest and longest diameter, endothelial cell density, and pachymetry were measured in sixty freshly enucleated porcine eyeballs. RESULTS: Corneal steepest meridian was 7.85±0.32mm, corneal flattest meridian was 8.28±0.32mm, shortest corneal diameter was 12...
October 3, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28985735/objective-and-subjective-diagnostic-parameters-in-the-fellow-eye-of-unilateral-keratoconus
#16
Eman A Awad, Waleed A Abou Samra, Magda A Torky, Amr M El-Kannishy
BACKGROUND: Keratoconus (KC) is usually a bilateral corneal ectatic disease. For significant asymmetric presentation (so called unilateral KC), the fellow eye has the mildest and earliest form of the disease, which is typically called forme fruste keratoconus. The aim of this study was to evaluate the sensitivity and specificity of parameters derived from a Scheimpflug imaging system (Pentacam) as well as the changes in the quality of mesopic vision in the apparently normal fellow eye (forme fruste) to detect the earliest and most sensitive parameters...
October 6, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28980568/-peripheral-corneal-cross-linking-p-cxl-for-ultrathin-corneas-with-severe-keratoconus-a-new-technique
#17
M Abbondanza, V De Felice, G Abbondanza
Corneal cross-linking (CXL) is aimed at halting the progression of keratoconus and is widely considered to be the golden standard in its treatment. It is usually contraindicated, however, in patients with corneal thickness of less than 400 µm, leaving the ophthalmic surgeon no option, but to perform transepithelial CXL (epi-on), usually regarded as less effective. We report a novel approach for ultrathin corneas with severe keratoconus - peripheral corneal cross-linking (P-CXL), in which corneal epithelium is still removed but the apex of the cornea is left untouched...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28969170/comparison-of-central-corneal-thickness-using-anterior-segment-optical-coherence-tomography-versus-ultrasound-pachymetry
#18
Prasanna Venkatesh Ramesh, Kirti Nath Jha, Krishnagopal Srikanth
INTRODUCTION: Corneal thickness is an important and sensitive indicator of corneal health. It is useful in monitoring corneal diseases such as corneal oedema and keratoconus, and selecting patients for refractive surgery. Central Corneal Thickness (CCT) is a risk factor for Primary Open-Angle Glaucoma (POAG). AIM: To compare CCT using ultrasound pachymetry and Anterior Segment Optical Coherence Tomography (AS-OCT), and also to find out the reproducibility of AS-OCT readings for both central and pericentral corneal areas...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28938381/accelerated-epi-on-versus-standard-epi-off-corneal-collagen-cross-linking-for-progressive-keratoconus-in-pediatric-patients
#19
Maria A Henriquez, Ana M Rodríguez, Luis Izquierdo
PURPOSE: To evaluate and compare the effectiveness and safety of accelerated transepithelial (A-epi-on) corneal collagen cross-linking (CXL) with standard CXL (epi-off) for children with progressive keratoconus. METHODS: Prospective, cohort study including 61 eyes of 51 patients younger than 18 years with progressive keratoconus at Oftalmosalud Instituto de Ojos, Lima, Peru. A-epi-on CXL was performed for 36 eyes using 30 minutes of impregnation (0.25% riboflavin, 1...
December 2017: Cornea
https://www.readbyqxmd.com/read/28935449/long-term-outcomes-of-corneal-cross-linking-for-keratoconus-in-pediatric-patients
#20
Paraskevi G Zotta, Vasilios F Diakonis, George D Kymionis, Michael Grentzelos, Kostas A Moschou
PURPOSE: To report the long-term outcomes of corneal cross-linking (CXL) in pediatric patients with bilateral progressive keratoconus. METHODS: The medical records of consecutive pediatric patients with bilateral progressive keratoconus who underwent CXL at a single institution from June 2007to December 2009 were reviewed. All eyes underwent CXL treatment in accordance with the original Dresden protocol. Pre- and post-operative (at 1 year and >5 years after CXL) examinations included, corneal thickness (CT) at the thinnest point, corneal topographic evaluation (flat, steep meridian keratometry and maximum keratometry), with manifest refraction and corrected distance visual acuity...
September 19, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
keyword
keyword
104445
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"