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Articles from Vishal Jhanji
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Longitudinal evaluation of posterior corneal changes after LASIK in high myopia: a swept-source optical coherence tomography study
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Comparison of corneal measurements in keratoconus using swept-source optical coherence tomography and combined Placido–Scheimpflug imaging
Read Full ArticlePurpose The aim of this study was to provide a comprehensive comparison of reliability of corneal topographic measurements in keratoconic eyes using swept-source optical coherence tomography (OCT) and a combined Placido–Scheimpflug imaging. Methods A total of 30 eyes of 30 patients were included. The mean age was 31.2 ± 8.4 years. Two consecutive topographic measurements were obtained for one eye of each patient using swept-source OCT (CASIA) and combined Placido–Scheimpflug imaging (TMS-5). Test–retest reliability of CASIA and TMS-5 measurements including central corneal thickness (CCT) and thinnest corneal thickness (TCT), keratometry at steep (Ks) and flat (Kf ...
Mentions: Marco Yu -
Change of Optical Intensity during Healing Process of Corneal Wound on Anterior Segment Optical Coherence Tomography
Read Full ArticleThe purpose of this study is to investigate the process of corneal wound healing after penetrating injury with the change in optical intensity on anterior segment optical coherence tomography (AS-OCT) and to investigate factors associated with severity of corneal scar. Forty-seven eyes from 47 patients with repaired corneal laceration were included. AS-OCT was performed on 1day, 1week, 1, 3 and 6 months after primary repair. Internal aberrations of wound edges were observed on AS-OCT images. Parameters including height of steps, width of gaps, maximal corneal thickness, area and optical intensity of corneal wound/scar were measured. The relationship between the ...
Mentions: Haoyu Chen -
Longitudinal Evaluation of Cornea With Swept-Source Optical Coherence Tomography and Scheimpflug Imaging Before and After Lasik
Read Full ArticleAbstract: Swept-source optical coherence tomography (OCT) is the latest advancement in anterior segment imaging. There are limited data regarding its performance after laser in situ keratomileusis (LASIK). We compared the reliability of swept-source OCT and Scheimpflug imaging for evaluation of corneal parameters in refractive surgery candidates with myopia or myopic astigmatism. Three consecutive measurements were obtained preoperatively and 1 year postoperatively using swept-source OCT and Scheimpflug imaging. The study parameters included central corneal thickness (CCT), thinnest corneal thickness (TCT), keratometry at steep (Ks) and flat (Kf) axes, mean keratometry (Km), and, anterior and posterior best fit spheres (Ant and Post ...
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Longitudinal Evaluation of Posterior Corneal Elevation after Laser Refractive Surgery Using Swept-Source Optical Coherence Tomography
Read Full ArticlePurpose To investigate the change in posterior corneal elevation up to 1 year after myopic femtosecond-assisted LASIK and photorefractive keratectomy (PRK). Design Prospective, longitudinal, comparative study. Participants Patients undergoing femtosecond-assisted LASIK or PRK. Methods Corneal imaging was performed using swept-source optical coherence tomography at baseline and at each postoperative follow-up. A 2-way analysis of variance model with repeated measures and a linear mixed effect model were used to compare the differences in posterior corneal elevation between LASIK and PRK at different points after adjusting for the preoperative spherical equivalent (SEQ), central corneal thickness (CCT), thinnest corneal thickness (TCT), residual bed ...
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Optical quality assessment in normal and forme fruste keratoconus eyes with a double-pass system: a comparison and variability study
Read Full ArticlePurpose To comparatively evaluate the image quality in normal and forme fruste keratoconus patients using a double-pass system. Methods Fourteen normal eyes and 15 eyes with forme fruste keratoconus were included. Corneal tomographic parameters were obtained with optical coherence tomography. Image quality characteristics were determined by an optical quality analysis system (OQAS). Two readings were obtained from each eye. The following parameters were analysed: modulation transfer function cutoff frequency (MTF), Strehl ratio and OQAS values (OV) at contrasts of 100% (OV-100), 20% (OV-20) and 9% (OV-9). Repeatability coefficient (RC), coefficient of variation (CVw) and intraclass correlation coefficient (ICC) were evaluated ...
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Intraoperative Pachymetry Using Spectral-Domain Optical Coherence Tomography during Accelerated Corneal Collagen Crosslinking
Read Full Article<p>accelerated corneal crosslinking (CXL). Methods. Intraoperative pachymetry was performed using SDOCT and ultrasound pachymetry (USP) in 6 eyes of 6 patients with keratoconus. Pachymetry readings were obtained at baseline, after epithelium removal and after 30 minutes of riboflavin instillation. SDOCT measurements of eyes with and without lid speculum during riboflavin instillation were compared. Results. There was no statistically significant difference in central corneal thickness (CCT) measurements between SDOCT and USP (
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Intrastromal fluid drainage with air tamponade: anterior segment optical coherence tomography guided technique for the management of acute corneal hydrops
Read Full ArticleAims To describe a new technique of corneal stab incision with intracameral air injection for management of patients with acute corneal hydrops. Methods Five patients with acute corneal hydrops with large Descemet's membrane (DM) detachment and multiple stromal clefts underwent the procedure. The technique entailed anterior segment optical coherence tomography guided intrastromal fluid drainage through multiple corneal stromal venting incisions along with anterior chamber air tamponade. The time taken for the DM to reattach, resolution of corneal oedema and the best-corrected visual acuity (BCVA) were assessed postoperatively. Results Five patients (age range, 10–25 years) with large DM detachment ...
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Corneal thickness and elevation measurements using swept source optical coherence tomography and slit scanning topography in normal and keratoconic eyes
Read Full ArticleBackground Optical coherence tomography is being used increasingly for corneal measurements. The current study compared corneal thickness and corneal elevation using SS-OCT (Casia, Tomey, Nagoya, Japan) and slit scanning topography (Orbscan IIz, Bausch & Lomb, Rochester, New York). Design Prospective study Participants 41 normal and 46 keratoconus subjects Methods All eyes were imaged using SS-OCT and slit scanning tomography during the same visit. Mean central (CCT) and thinnest (TCT) corneal thickness and best-fit sphere (BFS) measurements were compared between the instruments. Corneal thickness was also measured with ultrasound pachymetry (USP). Main outcome measures Agreement of measurements between SS-OCT and scanning slit ...
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Evaluation of Posterior Wound Profile After Penetrating Keratoplasty Using Anterior Segment Optical Coherence Tomography
Purpose: To study the wound configuration after penetrating keratoplasty (PKP) using anterior segment optical coherence tomography. Methods: All post-PKP patients who were examined at the Cornea Services of the Royal Victorian Eye and Ear Hospital, Melbourne, between February and November 2008, were enrolled in the study. The wound profile was studied using anterior segment optical coherence tomography. Results: A total of 159 graft-host sections from 29 eyes (24 patients, mean age 57 ± 20 years) were analyzed. Cases with remaining sutures were excluded from the study. The majority of patients included were operated for keratoconus (16 eyes, 55%) followed by endothelial ...Read Full Article
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