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https://www.readbyqxmd.com/read/29145265/corneal-clarity-measurements-in-healthy-volunteers-across-different-age-groups-observational-study
#1
Khaled Alzahrani, Fiona Carley, Arun Brahma, Debbie Morley, M Chantal Hillarby
The aim of this study was to standardize and investigate the changes in corneal clarity with age. Densitometry software for the Oculus Pentacam was used to examine corneal clarity at different age groups.A total of 192 eyes from 97 healthy participants were included in this cohort comparative nonrandomized, cross-sectional study. An Oculus Pentcam was used to image the cornea of healthy participants grouped by age (between 10 and 70 years old). Data from the densitometry output have been used to determine clarity in concentric zones and different depths of the cornea...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29141080/the-associations-of-lens-power-with-age-and-axial-length-in-healthy-chinese-children-and-adolescents-aged-6-to-18-years
#2
Shuyu Xiong, Bo Zhang, Yuan Hong, Xiangui He, Jianfeng Zhu, Haidong Zou, Xun Xu
Purpose: To investigate the relationship between lens power and age as well as the relationship between lens power and axial length (AL) in Chinese children and adolescents. Methods: The participants underwent a comprehensive ophthalmic examination that included AL, cycloplegic refraction, and Pentacam measurements. The crystalline lens power was calculated using Bennett's formula and then compared among the children of different age groups, refractive statuses, and AL categories...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29135710/adjustment-of-intrastromal-corneal-ring-segments-after-unsuccessful-implantation-in-keratoconic-eyes
#3
Tiago Monteiro, José Ferreira Mendes, Fernando Faria-Correia, Nuno Franqueira, David Madrid-Costa, José F Alfonso
PURPOSE: To evaluate visual, refractive, and corneal topography outcomes in eyes with keratoconus that have undergone exchange/adjustment surgery with a new intrastromal corneal ring segment (ICRS) combination after unsuccessful visual and/or refractive outcomes after primary ICRS surgery. METHODS: A retrospective nonrandomized case series was conducted including consecutive eyes of patients with keratoconus that underwent ICRS adjustment after an unsuccessful visual outcome...
November 13, 2017: Cornea
https://www.readbyqxmd.com/read/29124079/identifying-more-reliable-parameters-for-the-detection-of-change-during-the-follow-up-of-mild-to-moderate-keratoconus-patients
#4
Ivo Guber, Colm McAlinden, François Majo, Ciara Bergin
Background: Reaching a consensus on which parameters are most reliable at detecting progressive keratoconus patients with serial topography imaging is not evident. The aim of the study was to isolate the parameters best positioned to detect keratoconus progression using the Pentacam HR® measures based on the respective limits of repeatability and range of measurement. Method: Using the Pentacam HR®, a tolerance index was calculated on anterior segment parameters in healthy and keratoconic eyes...
2017: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29120713/waveform-analysis-of-deformation-amplitude-and-deflection-amplitude-in%C3%A2-normal-suspect-and-keratoconic-eyes
#5
Mathew Francis, Natasha Pahuja, Rushad Shroff, Roshan Gowda, Himanshu Matalia, Rohit Shetty, Everette J Remington Nelson, Abhijit Sinha Roy
PURPOSE: To evaluate the performance of waveform-derived variables in distinguishing normal, suspect, and keratoconic eyes. SETTING: Narayana Nethralaya Eye Hospital, Bangalore, India. DESIGN: Retrospective case series. METHODS: Scheimpflug tomography (Pentacam) and dynamic Scheimpflug analysis (Corvis ST) of 253 normal (253 patients) eyes and 205 keratoconic eyes (205 patients) were evaluated. Among the 205 patients, 62 had keratoconus in 1 eye, while the unaffected eye was suspect...
October 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29118708/corneal-collagen-cross-linking-combined-with-an-artiflex-iris-fixated-anterior-chamber-phakic-intraocular-lens-implantation-in-a-patient-with-progressive-keratoconus
#6
Sharif Hashmani, Nauman Hashmani, Roha Saeed Memon
We present here the case of a 24-year-old male who experienced progressive keratoconus and vision loss which adversely affected his ability to carry out everyday tasks. This landed him in the Hashmanis Hospital for consultation. He had a preoperative best corrected visual acuity of 6/12. He underwent multiple Oculus Pentacam examinations, which showed progressive keratoconus. Corneal collagen cross-linking (CXL) was performed to stabilize his cornea and, subsequently, an Artiflex anterior chamber iris-fixated phakic intraocular lens (ACIF-PIOL) was implanted to alleviate his refractive errors...
September 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/29111836/long-term-changes-in-backscattered-light-measurements-in-keratoconus-corneas-treated-with-collagen-cross-linking
#7
Gabor Nemeth, Jasmin Hassan, Laszlo Modis, Ziad Hassan
PURPOSE: Our aim was to compare densitometry data between keratoconus and normal corneas and to assess the long-term changes in corneal backscattered light values after corneal collagen cross-linking (CXL) treatment. MATERIAL AND METHODS: Retrospective analysis was performed on 26 eyes of normal patients (age: 32.71 ± 12.68 years) and 39 eyes of keratoconus patients (28.93 ± 7.59 years) using the Pentacam HR corneal densitometry module before CXL and during the postoperative period, which lasted a mean of 2...
November 7, 2017: Current Eye Research
https://www.readbyqxmd.com/read/29090045/comparison-between-pentacam-hr-and-orbscan-ii-after-hyperopic-photorefractive-keratectomy
#8
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/29081937/measurements-of-corneal-thickness-in-eyes-with-pseudoexfoliation-syndrome-comparative-study-of-different-image-processing-protocols
#9
Katarzyna Krysik, Dariusz Dobrowolski, Katarzyna Polanowska, Anita Lyssek-Boron, Edward A Wylegala
PURPOSE: Comparative analysis of central and peripheral corneal thickness in PEX patients using three different imaging systems: Pentacam-Scheimpflug device, time-domain optical coherence tomography (OCT) Visante, and swept-source OCT Casia. MATERIALS AND METHODS: 128 eyes of 80 patients with diagnosed PEX were examined and compared with 112 normal, non-PEX eyes of 72 cataract patients. The study parameters included 5 measured zones: central and 4 peripheral (superior, inferior, nasal, and temporal)...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29075015/the-quantitative-assessment-of-alterations-in-lens-transparency-after-transconjunctival-27-gauge-microincision-vitrectomy-surgery
#10
K Tekin, M Inanc, K Ozdemir, K Sonmez, P Yilmazbas
PurposeTo evaluate the baseline and post-vitrectomy lens densitometry values by a Scheimpflug camera in eyes with epiretinal membrane that were treated with 27-G microincision vitrectomy surgery (MIVS) without tamponade and to compare the results with those in fellow healthy eyes.Patients and methodsProspective case series. The lens densitometry measurements of 24 patients, who underwent 27-G MIVS without any tamponade for the treatment of epiretinal membrane, were taken preoperatively and on the first week, first month, and third month postoperatively with Pentacam HR-Scheimpflug imaging system...
October 27, 2017: Eye
https://www.readbyqxmd.com/read/29064187/posterior-corneal-surface-differences-between-non-laser-in%C3%A2-situ-keratomileusis-lasik-and-10-year-post-lasik-myopic-eyes
#11
Ma-Li Dai, Qin-Mei Wang, Zu-Shun Lin, Ye Yu, Jin-Hai Huang, Giacomo Savini, Jia Zhang, Ling Wang, Chen-Chen Xu
PURPOSE: To evaluate the posterior corneal surface differences between non-laser in situ keratomileusis (LASIK) and 10-year post-LASIK myopic eyes. METHODS: The study included 130 eyes from 65 patients, who were treated with myopic LASIK 10 years ago. In addition, 130 eyes from 65 unoperated myopic patients of matching present age and preoperative refraction were divided into control group. Data on the posterior corneal surface and anterior chamber were obtained from Pentacam software and compared between the groups...
October 24, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29035922/effect-of-scattering-and-aberrations-on-visual-acuity-for-band-keratopathy
#12
Kazutaka Kamiya, Hidenaga Kobashi, Masahide Takahashi, Nobuyuki Shoji, Kimiya Shimizu
SIGNIFICANCE: The progressive accumulation of the calcification may deteriorate corneal transparency, especially in the interpalpebral area, and subsequent visual performance for patients with band keratopathy. However, the detailed quantitative analysis of light scattering or higher-order aberrations on visual performance for these patients so far has not been elucidated. PURPOSE: The aim of this study was to assess the relationship of intraocular forward scattering, corneal backward scattering, and corneal higher-order aberrations with visual acuity in eyes with band keratopathy...
November 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29034562/canine-central-corneal-thickness-measurements-via-pentacam-hr-%C3%A2-optical-coherence-tomography-optovue-ivue-%C3%A2-and-high-resolution-ultrasound-biomicroscopy
#13
Allison E Wolfel, Samantha L Pederson, Allison M Cleymaet, Ann M Hess, Kate S Freeman
OBJECTIVE: To compare central corneal thickness (CCT) values in canine eyes using Pentacam-HR(®) Scheimpflug imaging (Pentacam), Optovue(®) iVue spectral-domain optical coherence tomography (SD-OCT), and high-resolution ultrasound biomicroscopy (UBM) and generate normative canine Pentacam CCT values. ANIMALS STUDIED: Twenty-four client-owned dogs (37 eyes) with nondiseased cornea(s) presenting to the Colorado State University Veterinary Teaching Hospital. PROCEDURES: Corneal images were acquired via Pentacam, SD-OCT, and UBM in the listed order...
October 15, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/29032108/pregnancy-induced-changes-in-corneal-biomechanics-and-topography-are-thyroid-hormone-related
#14
David Tabibian, Begoña M de Tejada, Zisis Gatzioufas, Sabine Kling, Vanessa S Meiss, Marc-Olivier Boldi, Véronique Othenin-Girard, Antonina Chilin, Julien Lambiel, Florence Hoogewoud, Farhad Hafezi
PURPOSE: To identify biomechanical and topographic changes of the cornea during pregnancy and the postpartum period and its association to hormonal changes. DESIGN: Prospective single-center observational cohort study. METHODS: Participants were 24 pregnant women (48 eyes), monitored throughout pregnancy and after delivery. Biomechanical and topographic corneal properties were measured using the Ocular Response Analyzer (ORA) and a Scheimpflug imaging system (Pentacam HR) each trimester and 1 month after delivery...
October 13, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29028106/correlation-between-presence-of-primary-iris-and-cilliary-body-cysts-and-intraocular-pressure
#15
K-C Xue, D-D Hu, L Zhao, N Li, H-Y Shen
OBJECTIVE: The objective of this study was to examine the correlation between the presence of primary iris-ciliary cysts and the intraocular pressure. PATIENTS AND METHODS: Sixty patients with short-sightedness undergoing routine examination for laser vision correction in our hospital in 2003 were enrolled. Patients with known high intraocular pressure and risk of glaucoma were excluded from the study. A total of 119 eyes were examined by the Ultrasound Biomicroscope (UBM), and the presence of the primary iris-ciliary cysts was confirmed...
September 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29022163/comparison-of-central-corneal-thickness-with-four-different-optical-devices
#16
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/29016452/intraocular-lens-position-in-combined-phacoemulsification-and-vitreoretinal-surgery
#17
Serdar Ozates, Hasan Kiziltoprak, Mustafa Koc, Mehmet Murat Uzel, Mehmet Yasin Teke
PURPOSE: To assess the decentration and angle of tilt of the intraocular lens (IOL) according to the intravitreal tamponade types used in combined phacoemulsification and vitreoretinal surgery. METHODS: This prospective and randomized clinical study involved 73 eyes of 69 patients who underwent combined vitreoretinal surgery. Eyes with intravitreal tamponades formed the study group and eyes without intravitreal tamponades formed the control group. The study group was further divided into silicone oil and gas tamponade subgroups...
October 9, 2017: Retina
https://www.readbyqxmd.com/read/28991609/optimized-keratometry-and-total-corneal-astigmatism-for-toric-intraocular-lens-calculation
#18
Giacomo Savini, Kristian Næser, Domenico Schiano-Lomoriello, Pietro Ducoli
PURPOSE: To compare keratometric astigmatism (KA) and different modalities of measuring total corneal astigmatism (TCA) for toric intraocular lens (IOL) calculation and optimize corneal measurements to eliminate the residual refractive astigmatism. SETTING: G.B. Bietti Foundation IRCCS, Rome, Italy. DESIGN: Prospective case series. METHODS: Patients who had a toric IOL were enrolled. Preoperatively, a Scheimpflug camera (Pentacam HR) was used to measure TCA through ray tracing...
September 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28991339/pupil-dynamics-induced-by-light-reflex-after-posterior-chamber-phakic-intraocular-lens-implantation
#19
Kazuko Totsuka, Hitoshi Ishikawa, Kazutaka Kamiya, Nobuyuki Shoji, Kimiya Shimizu
PURPOSE: To assess the light reflex of the pupil after Implantable Collamer Lens (ICL) (KS-aquaPORT; STAAR Surgical, Nidau, Switzerland) implantation to determine whether the ICL implantation might affect the pupil dynamics. METHODS: This study examined 28 eyes of 28 consecutive patients who underwent implantation of the posterior phakic ICL for the correction of myopia and astigmatism. Patient age at the time of surgery was 31.1 ± 6.8 years (range: 25 to 42 years)...
October 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28985735/objective-and-subjective-diagnostic-parameters-in-the-fellow-eye-of-unilateral-keratoconus
#20
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
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