A noncontact, Scheimpflug-based optical device (Pachycam, Oculus, Wetzlar, Germany) was used to measure the corneal thickness and curvature during the baseline examination of all participants. Only measurements with a quality score above 90% were accepted. Pachymetry is based on Scheimpflug images of a horizontal 4-mm section and reveals the central and thinnest corneal thicknesses. The Pachycam has an integrated keratometer that measures the central K-value as well as the K-values in the central 30°. Beginning with the 5-year follow-up, we replaced the Pachycam with the Pentacam HR (Oculus, Wetzlar, Germany) for corneal thickness measurements and keratometry. The Pentacam uses the same measurement technology, but it provides additional data on the architecture of the anterior segment of the eye (see anterior segment tomography). All of these tests started with the right eye.
Pachycam
Manufactured by Oculus
Sourced in Germany
The Pachycam is a high-resolution camera designed for scientific and industrial applications. It features a large, high-sensitivity image sensor capable of capturing detailed images and video under a wide range of lighting conditions. The Pachycam is known for its robust construction and reliable performance, making it a valuable tool for various research and documentation tasks.
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Lab products found in correlation
2 protocols using pachycam
1
Corneal Thickness and Curvature Measurement
2
Measurement of Intraocular Pressure and Lens Status
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IOP was measured with a noncontact tonometry and automatic air-puff control (NT 2000; Nidek, Inc., San Jose, CA, USA), the mean of three measurements within a 3 mm Hg range was obtained for each eye. The date and time of the measurement was recorded. IOP measurements were mainly performed between 11:00 and 18:00 hours. First, the right eye was measured three times followed by the left eye. If there was a difference of more than 3 mm Hg between the three measurements, the measurement was immediately repeated. For further calculations, the mean IOP value of the right and left eye was used. Further information on the lens status were determined with slit-lamp examination at baseline examination22 (link) and Scheimpflug imaging at follow-up examination.23 (link) Pachymetry was measured with Pachycam (Oculus, Wetzlar, Germany) at baseline and Pentacam HR (Oculus) at follow-up examination. Glaucoma status was determined on optic disc photographs and using frequency doubling technology perimetry according to a modified definition of the Glaucoma classification according to International Society of Geographical and Epidemiological Ophthalmology (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1771026/ ).24 (link)
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