Visante AS‐OCT CCT measurements were captured using the global pachymetric function. Ultrasound pachymetry of the right and left eyes revealed a CCT of 698 and 654 μm, respectively. The absence of corneal swelling due to the instillation of local anaesthetic and the algorithmic difference are valid reasons in explaining this variation. Newer instruments are currently available including the optical coherence tomography (OCT) instrument. To access the article, you may purchase it or purchase the complete back file collection A 63-year-old man with Fuchs’ dystrophy and cataract underwent successful phacoemulsification, insertion of a posterior chamber intraocular lens, and Descemet’s stripping endothelial keratoplasty (DSEK) of the right eye. There are many tech-niques currently available for determining In our case, at 1 month after DSEK, an apparently unreliable CCT was measured with ultrasound. Fifty eyes met the selection criteria of less than 9.00 D of spherical error, cylindrical power less than ‐4.00 D and no known corneal disease. ScienceDirect ® is a registered trademark of Elsevier B.V.Agreement among 3 Methods to Measure Corneal Thickness: Ultrasound Pachymetry, Orbscan II, and Visante Anterior Segment Optical Coherence TomographyCopyright © 2007 American Academy of Ophthalmology.


A history of dry eye syndrome or smoking was not a criterion for exclusion. It is used to perform corneal pachymetry prior to refractive surgery, for Keratoconus screening, LRI surgery and is useful in screening for patients suspected of developing glaucoma among other uses. Bland–Altman analysis was also carried out, determining the mean and 95 per cent limits of agreement (LOA).The 50 subjects, average age 56 ± 15 years, (range: 27 to 82), yielded 50 eyes for corneal thickness comparison. ScienceDirect ® is a registered trademark of Elsevier B.V.Central corneal thickness measurements using Orbscan II, Visante, ultrasound, and Pentacam pachymetry after laser in situ keratomileusis for myopiaCopyright © 2007 ASCRS and ESCRS.

Compared with the US measurement, Pentacam and Visante measurements significantly underestimated corneal thickness by a mean of 7.54 ± 15.06 μm (Pentacam and Visante measurements of corneal thickness 6 months after LASIK were significantly less than those obtained using Orbscan and US pachymetry, although all 4 measurement methods showed a high correlation with each other.Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, University Eye Center, Hong Kong Eye Hospital, Hong Kong, ChinaNo author has a financial or proprietary interest in any material or method mentioned.Supported in part by the Action for Vision Eye Foundation, Hong Kong, China.We use cookies to help provide and enhance our service and tailor content and ads. This method uses a tangential slit of light directed onto the cornea at a known angle. Measurements with a standard deviation of less than 12 microns were included.Pearson correlation coefficients were calculated to compare automated optical pachymetry and AS‐OCT with ultrasound. This case demonstrates that anterior segment optical coherence tomography imaging and analysis software may provide a more appropriate measurement of CCT in patients who have undergone DSEK.From the Department of Ophthalmology, University of North Carolina School of Medicine, Chapel Hill, North Carolina.Supported by Research to Prevent Blindness, Inc., New York, New York.The authors have no financial or proprietary interest in the materials presented herein.Address correspondence to Graham W. Lyles, MD, Department of Ophthalmology, 5151 Bioinformatics Bldg., CB #7040, Chapel Hill, NC 27599-7040. The Estimated Central Corneal Thickness of 770 μm Is Based on 16 Radial Scans Incorporating 2,048 Corneal Thickness Measurement Points.In our patient, the 1-month postoperative ultrasound measured CCT of 549 μm was deemed an artifact because approximately 30 μm of Descemet’s membrane and endothelium were removed from the recipient and 180 μm of donor cornea were inserted.To monitor corneal health after DSEK, reproducible measurements of CCT are necessary. Central and peripheral (4.0 mm from the corneal centre to the superior, inferior, nasal and temporal areas) corneal thickness was analyzed in 30 eyes of 15 patients (mean age, 26.8 ± 6.8 years), with the AS-OCT Visante both automatically (Global-Pachymetry Map) and manually (Flap Tool). Anterior segment optical coherence tomography had better agreement with the gold standard USP, as compared with Orbscan II. Corneal pachymetry is the process of measuring the thickness of the cornea.

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