Abstract
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 mid-peripheral cornea were 15.2 ± 3.2 mmHg and 15.7 ± 3.3 mmHg respectively. The mean mid-peripheral corneal thickness (578 µm) was sigificantly higher than the mean central thickness (538 µm) (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.
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Mok, K., Wong, CL. & Lee, VH. Tono-Pen tonometer and corneal thickness. Eye 13, 35–37 (1999). https://doi.org/10.1038/eye.1999.7
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DOI: https://doi.org/10.1038/eye.1999.7
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