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https://www.readbyqxmd.com/read/28342729/repeatability-and-agreement-of-scheimpflug-based-and-swept-source-optical-biometry-measurements
#1
Saadettin Sel, Jana Stange, Delia Kaiser, Laszlo Kiraly
PURPOSE: To evaluate the repeatability and comparability of biometry parameters between a Scheimpflug-based topography with axial length measurement (Pentacam AXL, Oculus, Wetzlar, Germany) and a swept-source optical biometry (IOLMaster 700, Carl Zeiss Meditec AG, Jena, Germany). METHODS: A total of 50 eyes from 50 adult subjects had biometry measurements in one session three times using the Pentacam AXL and the IOLMaster 700. Keratometry, anterior chamber depth (ACD) and axial length (AL) values were obtained by both devices...
March 22, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28337056/normative-values-and-contralateral-comparison-of-anterior-chamber-parameters-measured-by-pentacam-and-its-correlation-with-corneal-biomechanical-factors
#2
Mohammad Reza Sedaghat, Vahid Mohammad Zadeh, Kaveh Fadakar, Sakineh Kadivar, Mojtaba Abrishami
PURPOSE: To evaluate the normative values of anterior chamber parameters measured by Pentacam and corneal hysteresis (CH) and corneal resistance factor (CRF) measured by Ocular Response Analyzer (ORA) and their relationship. METHODS: In an observational cross-sectional study, patients aged 18-35 years were included. Exclusion criteria were history of any intraocular or corneal disease, anomaly or surgery; hyperopic spherical refraction more than +3, and myopic spherical refraction less than -5...
January 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28336222/evaluation-of-the-shifting-of-the-line-of-sight-and-higher-order-aberrations-of-eyes-with-keratoconus-after-corneal-cross-linking
#3
Pinar Kosekahya, Mustafa Koc, Kemal Tekin, Murat Uzel, Cemile Ucgul Atilgan, Mehtap Caglayan, Pelin Yilmazbas
AIM: To evaluate changes in the coordinates of the line of sight (LoS) and higher order aberrations (HOAs) of eyes with keratoconus, following corneal cross-linking (CXL). METHODS: All patients (93 eyes) underwent detailed ophthalmologic examination and Pentacam HR measurements at baseline and at 3, 6, and 12 months after corneal CXL. LoS coordinates on the horizontal (x) and vertical (y) axes, vertical coma, vertical trefoil, spherical aberration, total root-mean square (RMS), and HOA-RMS values were recorded along with visual acuity and topographical parameters...
March 20, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28299003/comparison-between-two-scheimpflug-anterior-segment-analyzers
#4
Alireza Baradaran-Rafii, Tahmineh Motevasseli, Forouzan Yazdizadeh, Farid Karimian, Sahba Fekri, Amir Baradaran-Rafii
PURPOSE: To compare the anterior segment indices measured by two Scheimpflug camera machines; Galilei and Pentacam. METHODS: In this observational case series, the anterior segment indices of myopic healthy subjects seeking for refractive surgery were measured by Pentacam and Galilei on the same day. Analyzed parameters were anterior and posterior best fit spheres (BFS), axial curvature, true corneal power, central corneal thickness (CCT), anterior chamber (AC) depth, AC volume, AC angle, and pupil diameter...
January 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28296765/intermittent-pupillary-capture-of-intraocular-lens-after-transscleral-fixation-in-congenital-ectopia-lentis-patient-triggered-by-dark-environment-a-case-report
#5
Zhirong Wang, Qianzhong Cao, Guangming Jin, Charlotte Aimee Young, Yiyao Wang, Danying Zheng
RATIONALE: Although transscleral-fixated intraocular lens (IOL) implantation has been the most frequently chosen treatment for patients with inadequate capsule support, the ghost pupillary capture phenomenon did not cause enough attention. PATIENT CONCERNS: We present an unusual case withintermittent pupillary capture of intraocular lens. DIAGNOSIS: After 5 minutes staying in the dark environment, the pentacam examination revealed a mild nasal pupillary capture of the IOL...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28270858/complementary-keratoconus-indices-based-on-topographical-interpretation-of-biomechanical-waveform-parameters-a-supplement-to-established-keratoconus-indices
#6
Susanne Goebels, Timo Eppig, Stefan Wagenpfeil, Alan Cayless, Berthold Seitz, Achim Langenbucher
Purpose. To build new models with the Ocular Response Analyzer (ORA) waveform parameters to create new indices analogous to established topographic keratoconus indices. Method. Biomechanical, tomographic, and topographic measurements of 505 eyes from the Homburger Keratoconus Centre were included. Thirty-seven waveform parameters (WF) were derived from the biomechanical measurement with the ORA. Area under curve (ROC, receiver operating characteristic) was used to quantify the screening performance. A logistic regression analysis was used to create two new keratoconus prediction models based on these waveform parameters to resample the clinically established keratoconus indices from Pentacam and TMS-5...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28263734/comparison-of-axial-length-corneal-and-anterior-chamber-depth-measurements-of-two-recently-introduced-devices-to-a-known-biometer
#7
Mehdi Shajari, Carla Cremonese, Kerstin Petermann, Pankaj Singh, Michael Müller, Thomas Kohnen
PURPOSE: Evaluate agreement and repeatability of axial length (AL), corneal curvature and anterior chamber depth (ACD) measurements of two new devices, one using Scheimpflug technology combined with partial coherence interferometry (Pentacam AXL from Oculus, Germany) and one using swept-source OCT (IOL Master 700 from Zeiss, Germany) to a widely-used optical biometer (IOL Master 500 from Zeiss, Germany). DESIGN: Prospective, instrument reliability analysis METHODS: Setting: Department of Ophthalmology, Goethe-University, Frankfurt am Main, Germany Study population: 79 eyes of 79 patients Study Procedure: All eyes were measured with the IOL Master 500, the IOL Master 700 and with the Pentacam AXL...
March 2, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28260857/corneal-thickness-in-dry-eyes-in-an-iraqi-population
#8
Noora Mauwafak Ali, Furkaan M Hamied, Qasim K Farhood
BACKGROUND: Dry eye disorder is a multifactorial disease of the tears and ocular surface that results in discomfort and visual disturbance. Corneal pachymetry becomes increasingly important in refractive surgery, for the accurate assessment of intraocular pressure, and in the preoperative assessment of other ocular surgeries. PURPOSE: To assess the effect of dry eye disorder on the central corneal thickness (CCT) by comparing with CCT of normal eyes of age-matched individuals...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28251079/corneal-biomechanical-data-and-biometric-parameters-measured-with-scheimpflug-based-devices-on-normal-corneas
#9
Gabor Nemeth, Eszter Szalai, Ziad Hassan, Agnes Lipecz, Zsuzsa Flasko, Laszlo Modis
AIM: To analyze the correlations between ocular biomechanical and biometric data of the eye, measured by Scheimpflug-based devices on healthy subjects. METHODS: Three consecutive measurements were carried out using the corneal visualization Scheimpflug technology (CorVis ST) device on healthy eyes and the 10 device-specific parameters were recorded. Pentacam HR-derived parameters (corneal curvature radii on the anterior and posterior surfaces; apical pachymetry; corneal volume; corneal aberration data; depth, volume and angle of the anterior chamber) and axial length (AL) from IOLMaster were correlated with the 10 specific CorVis ST parameters...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28244934/repeatability-of-central-corneal-thickness-measurement-using-rotating-scheimpflug-camera-in-dry-and-normal-eyes
#10
Jong-Hyuck Lee, Jae Hyuck Kim, Sun Woong Kim
PURPOSE: To compare the repeatability of central corneal thickness (CCT) measurement using the Pentacam between dry eyes and healthy eyes, as well as to investigate the effect of artificial tears on CCT measurement. METHODS: The corneal thicknesses of 34 patients with dry eye and 28 healthy subjects were measured using the Pentacam. One eye from each subject was assigned randomly to a repeatability test, wherein a single operator performed three successive CCT measurements time points-before and 5 min after instillation of one artificial teardrop...
February 27, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28230557/comparison-of-the-conventional-dresden-protocol-and-accelerated-protocol-with-higher-ultraviolet-intensity-in-corneal-collagen-cross-linking-for-keratoconus
#11
Moonjung Choi, Jiwon Kim, Eung Kweon Kim, Kyoung Yul Seo, Tae-Im Kim
PURPOSE: To compare the accelerated corneal cross-linking (CXL) protocol and the conventional Dresden protocol in patients with keratoconus in terms of visual acuity, keratometric values, and topographic parameters. METHODS: Twenty-eight eyes of 25 patients with primary keratoconus were divided into 2 groups; 15 eyes in group 1 received CXL under the standard Dresden protocol (3 mW/cm for 30 min, dose 5.4 J/cm) and 13 eyes in group 2 were treated with the accelerated protocol (30 mW/cm for 3 min 40 s, dose 6...
February 22, 2017: Cornea
https://www.readbyqxmd.com/read/28210179/corneal-biomechanics-in-normal-saudi-individuals
#12
Khalid Al-Arfaj, Sanaa A Yassin, Walaa Al-Dairi, Fatimah Al-Shamlan, Mohanna Al-Jindan
PURPOSE: The aim of this study was to determine and relate corneal biomechanical metrics with demographic, tomographic and refractive data in healthy Saudi people. DESIGN: Prospective, cross-sectional, observational study. PARTICIPANTS: The study included 215 normal Saudi adult individuals. METHODS: Corneal hysteresis (CH) and corneal resistance factor (CRF), Goldmann-correlated intraocular pressure (IOPg) and corneal-compensated intraocular pressure (IOPcc) were measured by ocular response analyzer...
July 2016: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28192586/three-year-stability-of-posterior-corneal-elevation-after-small-incision-lenticule-extraction-smile-for-moderate-and-high-myopia
#13
Yu Zhao, Weijun Jian, Yingjun Chen, Michael C Knorz, Xingtao Zhou
PURPOSE: To investigate long-term changes in posterior corneal elevation after small incision lenticule extraction (SMILE). METHODS: Thirty-six eyes of 20 patients (7 male, 13 female) who underwent SMILE were recruited for this prospective consecutive study. The mean preoperative manifest spherical equivalent was -6.24 ± 1.47 diopters (D) (range: -3.88 to -8.75 D). Posterior corneal surfaces were measured by a Scheimpflug camera (Pentacam; Oculus Optikgeräte GmbH, Wetzlar, Germany) preoperatively and at 1 month, 6 months, 12 months, 2 years, and 3 years after surgery...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28192585/correlations-of-objective-metrics-for-quantifying-dysfunctional-lens-syndrome-with-visual-acuity-and-phacodynamics
#14
Fernando Faria-Correia, Isaac Ramos, Bernardo Lopes, Tiago Monteiro, Nuno Franqueira, Renato Ambrósio
PURPOSE: To study the relationship between objective metrics for quantifying crystalline lens dysfunction with visual impairment and phacodynamics parameters in age-related nuclear cataracts. METHODS: A total of 51 eyes (34 patients) with age-related nuclear cataract had phacoemulsification. The Dysfunctional Lens Index (0 to 10 points) was measured by a ray-tracing aberrometry (iTrace Visual Function Analyzer; Tracey Technologies, Houston, TX). The average lens density (0 to 100) was evaluated using a rotating Scheimpflug system (Pentacam HR; Oculus Optikgeräte GmbH, Wetzlar, Germany), and the nuclear opalescence score was subjectively assessed using the Lens Opacities Classification System III (LOCS III)...
February 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28185842/corneal-astigmatism-measurement-by-ray-tracing-versus-anterior-surface-based-keratometry-in-candidates-for-toric-iol-implantation
#15
Ugo de Sanctis, Piero Donna, Rachele R Penna, Maria Isabella Calastri, Chiara M Eandi
PURPOSE: To compare corneal astigmatism derived from total corneal refractive power (CATCRP), a ray-tracing method, with that derived from simulated keratometry (CASimK), an anterior surface-based method, in candidates for toric intraocular lens (IOL) implantation. DESIGN: Reliability analysis. METHODS: In one eye of 200 consecutive patients (mean age 71 ±9 years) with cataract, a Pentacam HR (Oculus, Wetzlar, Germany) was used to measure CATCRP and CASimK...
February 6, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28178925/torsional-and-flattening-effect-on-corneal-astigmatism-after-cataract-surgery-a-retrospective-analysis
#16
Yuli Park, Hyun Seung Kim
BACKGROUND: To evaluate the torsional and flattening effect of steep meridian incisions and influence of posterior corneal astigmatism (PCA) on total corneal astigmatism (TCA) after cataract surgery. METHODS: One hundred thirty-two eyes underwent cataract surgery with steep meridian 2.2 mm microcoaxial and 2.85 mm conventional clear corneal incisions. Eyes were divided into with-the-rule (WTR) astigmatism and against-the-rule (ATR) astigmatism groups depending on the steeper meridian and measured with autokeratorefractor and Pentacam® before surgery, at 1 day, 1 week, 1 and 2 months postoperatively...
February 8, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28163862/comparison-of-central-corneal-thickness-measurements-by-pentacam-and-ultrasound-pachymetry-in-normal-myopic-patients
#17
Sherif Emerah, Ehab ELZakzouk, Mohamed Farag
INTRODUCTION: Precise measurement of corneal thickness is of crucial importance in corneal refractive procedures. The aim of this work is to compare the central corneal thickness measurements using Scheimpflug imaging (Pentacam) and contact US pachymetry in normal myopic patients. METHODS: This retrospective cohort study was conducted on in 144 eyes of 72 normal myopic patients during 6 months. The study location was the Research Institute of Ophthalmology (Giza, Egypt), and Magrabi Eye Hospital (Dubai, United Arab Emirates)...
December 2016: Electronic Physician
https://www.readbyqxmd.com/read/28149779/clinical-evaluation-of-surgery-induced-astigmatism-in-cataract-surgery-using-2-2-mm-or-1-8-mm-clear-corneal-micro-incisions
#18
Jun Yang, Xiu Wang, Hong Zhang, Yi Pang, Rui-Hua Wei
AIM: To evaluate corneal astigmatism after phacoemulsification using 2.2 mm or 1.8 mm clear corneal micro-incisions and its effects on visual function. METHODS: Sixty cases (60 eyes) with cataract were randomly divided into groups A (n=30) and B (n=30) respectively underwent 2.2 mm and 1.8 mm clear corneal tunnel incision phacoemulsification combined with folding intraocular lens implantation from the time direction of 11:00. On day 1 and at 1, 4, and 6wk after operation, patients' vision was measured and both the corneal curvature and corneal thickness (CT) were recorded using Pentacam...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28129300/multimodal-assessment-of-corneal-thinning-using-optical-coherence-tomography-scheimpflug-imaging-pachymetry-and-slit-lamp-examination
#19
Julius T Oatts, Jeremy D Keenan, Tova Mannis, Tom M Lietman, Jennifer Rose-Nussbaumer
PURPOSE: To assess the relationship between corneal thinning measured by clinician-graded slit-lamp examination compared with ultrasound pachymetry (USP), anterior segment optical coherence tomography (AS-OCT), and the Pentacam. METHODS: Patients with corneal thinning underwent USP, AS-OCT, Pentacam measurements and standardized clinical grading by 2 cornea specialists estimating thinning on slit-lamp examination. Reproducibility of each testing modality was assessed using the intraclass correlation coefficient...
January 26, 2017: Cornea
https://www.readbyqxmd.com/read/28129291/characteristics-of-corneal-astigmatism-of-anterior-and-posterior-surface-in-a-normal-control-group-and-patients-with-keratoconus
#20
Mehdi Shajari, Stefan Friderich, Miad Pour Sadeghian, Ingo Schmack, Thomas Kohnen
PURPOSE: To evaluate and compare power and axis orientation of anterior and posterior astigmatism in eyes with keratoconus with healthy eyes. METHODS: In this retrospective cohort study, we examined 861 eyes of 494 patients diagnosed with keratoconus at the Department of Ophthalmology, University Hospital Frankfurt, and 256 eyes of 256 healthy individuals. Using a Scheimpflug device (Pentacam HR), we measured the magnitude and axis orientation of anterior and posterior corneal astigmatism, corneal thickness, and conus location...
January 26, 2017: Cornea
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