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https://www.readbyqxmd.com/read/28432114/intereye-asymmetry-in-bilateral-keratoconus-keratoconus-suspect-and-normal-eyes-and-its-relationship-with-disease-severity
#1
Mohammad Naderan, Mohammad Taher Rajabi, Parviz Zarrinbakhsh
BACKGROUND/AIM: To describe the intereye asymmetry in patients with keratoconus (KC), keratoconus suspect (KCS) and normal participants, and to evaluate the relationship between asymmetry and disease severity. METHODS: In this prospective observational comparative study, 446 patients with bilateral KC, 68 patients with bilateral KCS and 306 normal participants underwent topographic, keratometric and pachymetric evaluations by Pentacam as well as refractive and visual acuity examinations...
April 21, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28412801/-preliminary-report-on-the-application-of-femtosecond-laser-assisted-anterior-capsulotomy-in-intumescent-white-cataract-surgery
#2
T T Peng, Y Wang, X Y Bao
Objective: To assess the effect of femtosecond laser-assisted anterior capsulotomy in intumescent white cataract surgery. Methods: Retrospective case series study. One hundred and fifty cataract patients (150 eyes) from June 2014 to June 2015 in Wuhan Aier ophthalmology hospital were enrolled in this study. They were divided into three groups: 50 intumescent white cataract patients (50 eyes) in the study group were performed femtosecond laser-assisted capsulotomy (LenSx system) operation selectively. Fifty intumescent white cataract patients (50 eyes) underwent normal manual continuous circular capsulorhexis as the control group 1...
April 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28412797/-correlation-between-axial-length-and-corneal-curvature-and-spherical-aberration
#3
X J Wang, Y Z Bao
Objective: To discuss the correlation between axial length and corneal curvature and corneal spherical aberration in a group of cataract patients with axial length greater than 24 mm. Methods: Retrospective case series. This study comprised 117 (234 eyes) age-related cataract patients. There were 51 men (43.59%) and 66 women (56.41%) with mean age of (69.0±8.7) years (range from 52.0 to 85.0 years). The average axial length was 27.6±1.8 (range from 24.2 to 31.9 mm). We devided them into four groups according to the axial length...
April 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28403194/calculations-of-actual-corneal-astigmatism-using-total-corneal-refractive-power-before-and-after-myopic-keratorefractive-surgery
#4
Kyoung Yul Seo, Hun Yang, Wook Kyum Kim, Sang Min Nam
PURPOSE: To calculate actual corneal astigmatism using the total corneal refractive astigmatism for the 4-mm apex zone of the Pentacam (TCRP4astig) and keratometric astigmatism (Kastig) before and after photorefractive keratectomy or laser in situ keratomileusis. METHODS: Uncomplicated 56 eyes after more than 6 months from the surgery were recruited by chart review. Various corneal astigmatisms were measured using the Pentacam and autokeratometer before and after surgery...
2017: PloS One
https://www.readbyqxmd.com/read/28396804/impact-of-treatment-decentration-on-higher-order-aberrations-after-smile
#5
Ying Yu, Wenwen Zhang, Xinliang Cheng, Jianru Cai, Hui Chen
Purpose. To evaluate decentration following femtosecond laser small incision lenticule extraction (SMILE) and sub-Bowman keratomileusis (SBK) and its impact on higher-order aberrations (HOAs). Methods. Prospective, nonrandom, and comparison study. There were 96 eyes of 52 patients who received SMILE and 96 eyes of 49 patients who received SBK in this study. Decentration was calculated 6 months after surgery with Pentacam. HOAs and visual acuity after the surgery were examined for patients in both groups before and 6 months after surgery...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28396803/corneal-clarity-and-visual-outcomes-after-small-incision-lenticule-extraction-and-comparison-to-femtosecond-laser-assisted-in-situ-keratomileusis
#6
Apostolos Lazaridis, Konstantinos Droutsas, Walter Sekundo, Michael Petrak, Stephan Schulze
Purpose. To evaluate corneal clarity and visual outcomes after small-incision lenticule extraction (SMILE) and compare them to femtosecond laser-assisted in situ keratomileusis (FS-LASIK). Materials and Methods. Fifty-eight myopic eyes of 33 patients who underwent SMILE were compared to 58 eyes of 33 patients treated with FS-LASIK. All procedures were performed using VisuMax® femtosecond laser and MEL 80® excimer laser (Carl Zeiss Meditec AG, Germany). Pentacam™ (Oculus, Germany) was used for pre- and 3-month postoperative corneal densitometry (CD) analysis...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28379654/corneal-collagen-crosslinking-for-post-lasik-ectasia-an-australian-study
#7
Jessica Y Tong, Deepa Viswanathan, Christopher Hodge, Gerard Sutton, Colin Chan, John J Males
PURPOSE: Post laser-assisted in situ keratomileusis (LASIK) ectasia is a rare and unpredictable complication after LASIK. Corneal collagen crosslinking (CXL) has emerged as a promising technique to address this complication. Our study evaluates the long-term efficacy of CXL for post-LASIK ectasia in an Australian setting. DESIGN: Retrospective review of post-LASIK ectasia patients referred to and treated at 3 corneal refractive surgery institutions in Sydney, Australia...
March 29, 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28368992/validation-of-an-objective-keratoconus-detection-system-implemented-in-a-scheimpflug-tomographer-and-comparison-with-other-methods
#8
Irene Ruiz Hidalgo, Jos J Rozema, Alain Saad, Damien Gatinel, Pablo Rodriguez, Nadia Zakaria, Carina Koppen
PURPOSE: To validate a recently developed program for automatic and objective keratoconus detection (Keratoconus Assistant [KA]) by applying it to a new population and comparing it with other methods described in the literature. METHODS: KA uses machine learning and 25 Pentacam-derived parameters to classify eyes into subgroups, such as keratoconus, keratoconus suspect, postrefractive surgery, and normal eyes. To validate this program, it was applied to 131 eyes diagnosed separately by experienced corneal specialists from 2 different centers (Fondation Rothschild, Paris, and Antwerp University Hospital [UZA])...
March 31, 2017: Cornea
https://www.readbyqxmd.com/read/28367522/corneal-thickness-measurements-with-scheimpflug-and-slit%C3%A2-scanning%C3%A2-imaging-techniques-in-keratoconus
#9
Mohammad Aghazadeh Amiri, Hassan Hashemi, Shahroukh Ramin, Abbasali Yekta, Azadeh Taheri, Payam Nabovati, Mehdi Khabazkhoob
PURPOSE: To determine the repeatability of corneal thickness measurements with Scheimpflug (Pentacam) and slit scanning (Orbscan) imaging techniques in different grades of keratoconus. METHODS: This study was conducted as a cross-sectional research. Imaging with Orbscan and Pentacam was performed on patients with different grades of keratoconus. With each device, 3 measurements were taken at 10 min intervals. Repeatability indices in different grades of keratoconus were calculated for each device...
March 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28361378/evaluation-of-corneal-topographic-changes-and-surgically-induced-astigmatism-after-transconjunctival-27-gauge-microincision-vitrectomy-surgery
#10
Kemal Tekin, Kenan Sonmez, Merve Inanc, Kubra Ozdemir, Yasin Sakir Goker, Pelin Yilmazbas
PURPOSE: To evaluate the corneal topographic changes and postvitrectomy astigmatism after 27-gauge (g) microincision vitrectomy surgery (MIVS) by using Pentacam HR-Scheimpflug imaging system. METHODS: This prospective descriptive study included 30 eyes of 30 patients who underwent 27-g MIVS. All eyes underwent a Pentacam HR examination preoperatively and on the first week, first month and third month postoperatively. The power of the corneal astigmatism, mean keratometry (K m), K 1 and K 2 values and corneal asphericity (Q value) values for the both front and back surfaces of the cornea, index of surface variance (ISV), index of vertical asymmetry (IVA), index of height asymmetry (IHA), index of height decentration (IHD) and higher-order aberrations including coma, trefoil, spherical aberration, higher-order root-mean-square and total RMS were recorded...
March 30, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28357136/repeatability-and-agreement-of-central-corneal-thickness-and-keratometry-measurements-between-four-different-devices
#11
Laszlo Kiraly, Jana Stange, Kathleen S Kunert, Saadettin Sel
Background. To estimate repeatability and comparability of central corneal thickness (CCT) and keratometry measurements obtained by four different devices in healthy eyes. Methods. Fifty-five healthy eyes from 55 volunteers were enrolled in this study. CCT (IOLMaster 700, Pentacam HR, and Cirrus HD-OCT) and keratometry readings (IOLMaster 700, Pentacam HR, and iDesign) were measured. For statistical analysis, the corneal spherocylinder was converted into power vectors (J0, J45). Repeatability was assessed by intraclass correlation coefficient (ICC)...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28346277/myopic-laser-corneal-refractive-surgery-reduces-interdevice-agreement-in-the-measurement-of-anterior-corneal-curvature
#12
Haiying Jin, Zhongmin Ou, Haike Guo, Peiquan Zhao
OBJECTIVES: To investigate interdevice differences and agreement in the measurement of anterior corneal curvature obtained by different technologies after laser corneal refractive surgery. METHODS: The prospective study comprised 109 eyes of 109 consecutive patients who had undergone laser-assisted in situ keratomileusis (LASIK). Preoperative and postoperative corneal parameters were measured by Scheimpflug imaging (Pentacam), Placido-slit-scanning (Orbscan) and auto-keratometry (IOLMaster)...
March 24, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28342729/repeatability-and-agreement-of-scheimpflug-based-and-swept-source-optical-biometry-measurements
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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