Placido-Based Indices of Corneal Irregularity
نویسندگان
چکیده
منابع مشابه
Corneal collagen crosslinking in progressive keratoconus: Changes in corneal irregularity indices and correlation with the best spectacle-corrected visual acuity
METHODS: This is a retrospective uncontrolled study in eyes with progressive KC. In all 62 eyes from 48 patients, BSCVA, mean K, corneal irregularity at 3 mm and 5 mm were measured before CXL, at six months, and then annually until the last visit. For data analysis, patients were divided into three groups according to their mean preoperative K: group 1 included 12 patients with mean K value les...
متن کامل[Preliminary results of a wide-angle corneal topography system for Placido-based videokeratographers].
PURPOSE To develop the instrumentation and software for wide-angle corneal topography using a Placido-based videokeratographer. The objective is to allow the measurement of a greater area of the cornea using a simple adaptation to the Placido mire. METHODS Using the traditional Placido disc of a commercial corneal topographer, 9 LEDs (Light Emitting Diodes) were installed on the conic mire so...
متن کاملCorneal thickness, curvature, and elevation readings in normal corneas: combined Placido-Scheimpflug system versus combined Placido-scanning-slit system.
PURPOSE To evaluate agreement in central corneal thickness (CCT), keratometry, and anterior and posterior elevation map measurements in normal corneas between a combined Placido-Scheimpflug system and a combined Placido-scanning-slit elevation topography system. SETTING Department of Cataract & Refractive Surgery, Rothschild Foundation, Paris, France. DESIGN Evaluation of diagnostic test or...
متن کاملEstimating variability in placido-based topographic systems.
PURPOSE To describe a new software tool for the detailed presentation of corneal topography measurements variability by means of color-coded maps. METHODS Software was developed in Visual Basic to analyze and process a series of 10 consecutive measurements obtained by a topographic system on calibration spheres, and individuals with emmetropic, low, high, and irregular astigmatic corneas. Cor...
متن کاملPrecision of Corneal Thickness Measurements Obtained Using the Scheimpflug-Placido Imaging and Agreement with Ultrasound Pachymetry
Purpose. To assess the reliability and comparability of measuring central corneal thickness (CCT) and thinnest corneal thickness (TCT) using a new Scheimpflug-Placido analyzer (TMS-5, Japan) and ultrasound (US) pachymetry. Methods. Seventy-six healthy subjects were prospectively measured 3 times by 1 operator using the TMS-5, 3 additional consecutive scans were performed by a second operator, a...
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ژورنال
عنوان ژورنال: Optometry and Vision Science
سال: 2011
ISSN: 1040-5488
DOI: 10.1097/opx.0b013e3182279ff8