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Typical Clinical Studies
One study undertaken by Suzuki1 has, for example, undertaken a comparison of the Orbscan scanning slit corneal topography/pachymetry unit, the Topcon SP2000P non-contact specular microscopy system and the Tomey ultrasound pachymetry system. In their specific study, a series of 216 healthy eyes of 114 subjects were analysed. Specific results of the study are indicated in Table 1.
It is noted, that in the course of ultrasound pachymetry, one source of potential error is the deviation from perpendicular of the probe's application to the corneal surface. This is indicated in Figure 1 where the potential increase in path length of ultrasound will appear to increase the corneal thickness.
The increase in measured thickness, PI, assuming a nominal corneal thickness of 535 microns with angle § as indicated in Figure 1 is given by:
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