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Abstract #5246 Published in IGR 1-2
Tono-Pen tonometer and corneal thickness.
Mok KH; Wong CS; Lee VWEye 1999; 13: 35-37
PURPOSE: To compare the intraocular pressure (IOP) measurements taken at the central cornea with those taken at the mid-peripheral cornea using the Tono-Pen tonometer. METHODS: Forty-eight normal human subjects had their IOP measurements taken (i) with the Goldmann tonometer, (ii) with the Tono-Pen at the central cornea and (iii) with the Tono-Pen at the mid-peripheral cornea. The central and mid-peripheral corneal thickness at the site of IOP measurements were then determined by ultrasonic pachymetry. RESULTS: The mean IOP with the Goldmann tonometer was 15.7 ± 3.1 mmHg. The mean Tono-Pen IOPs at the central and midperipheral cornea were 15.2 ± 3.2 mmHg and 15.7 ± 3.3 mmHg respectively. The mean midperipheral corneal thickness (578 microns) was significantly higher than the mean central thickness (538 microns) (p < 0.001). CONCLUSION: There was no significant difference between the IOP taken with the Tono-Pen and with the Goldmann tonometer. In addition, no clinically significant difference was observed between the IOP readings of central and mid-peripheral cornea measured by the Tono-Pen.
Queen Mary Hospital Unit, Department of Ophthalmology and Visual Sciences, Chinese University of Hong Kong, China. mokkh@ha.org.hk
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
