Pentacam vs orbscan manual

Keratoconus is not fully understood, and its progression is unpredictable. Dr. Stark explained that the cause of the condition is multifactorial. "Keratoconus is an abnormality of the collagen and can be associated with skin disease, such as atopic dermatitis," he said. "So the condition is partly linked to this skin condition and partly The combined measurement errors for the mean anterior keratometry Ka,m show a narrow range between 0.12 D (Galilei) and 0.18 D (Pentacam), with 1 outlier at 0.52 D (Orbscan). This is also seen for the mean posterior keratometry Kp,m, with values of 0.05 D (Pentacam and Galilei) and an outlier at 0.17 D (Orbscan). Compared with the USP, Pentacam and Visante measurements significantly under-estimated corneal thickness by a mean of 7.54 +/- 15.06 microm (p < 0.01) and 11.64 +/- 12.87 microm (p < 0.01), respectively. There was no statistically significant difference between USP and Orbscan measurements. The Pentacam measured mean R1 of 7.90 mm and R2 of 7.69 mm. For anterior chamber depth values, a small statistically significant difference of 0.05 mm (P<.001) was found (corresponding to 0.01 D). Mean anterior chamber depth measured from the epithelium was 3.20 mm for the IOLMaster and 3.25 mm for the Pentacam. Orbscan. The Orbscan corneal topography system uses a scanning optical slit design that is fundamentally different from the corneal topography that analyzes the reflected images from the anterior corneal surface. The high-resolution video camera captures 40 light slits at the 45° angle projected through the cornea similarly as seen during slit Below are the multimap (4x) options in the Orbscan (Bausch and Lomb, NY) topographer which is placido and scanning slit based and the Sirius (CSO, Italy) tomograph and topographer which is Placido-disk and Scheimpflug based. Step 3. Next step is to look at the pseudocolor scale and identify the range and gradient of the values given. Comparison of the corneal power measurements with the tms4-topographer, pentacam hr, iol master, and javal keratometer. Middle East African Journal of Ophthalmology, 2015. Abbasali Yekta. Mehdi Khabazkhoob. ebrahim jafarzadehpur. Download Download PDF. Oculus Pentacam, and Orbscan II. Bland−Altman analysis of anterior chamber depth (ACD) measurements obtained with the Orbscan and IOLMaster. Orbscan ACD measurements were an average of 0.05 mm less than Pentacam measurements (p = 0.01). The mean difference between Orbscan and Pentacam measurements was only 1.44% of the mean ACD calculated across all measurements ( Fig. 3 ). Screening display for refractive surgery uses the ±75-μm elevation scale for all refractive patients (use a ±150-μm scale for evaluating pathology, not screening for normal patients) and use the color scale called intuitive, which developed for Oculus, Inc., when screen elevation and pachymetry maps. you limit my display so that it shows only the central 9-mm zone of the eye. it has been shown that corneal haze can affect the scanning light system of orbscan ii, resulting in pachymetry measurements that are lower than those obtained using ultrasound. 27 one possible explanation for the differences in pachymetry measurements between orbscan ii and pentacam hr or galilei could be the presence of subclinical corneal haze … 14. Sayed KM, Alsamman AH. Interchangeability between Pentacam and IOLMaster in phakic intraocular lens calculation. Eur J Ophthalmol. 2015;25(3):202-207. 15. Karunaratne