Tono-Pen tonometer and corneal thickness

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...

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Veröffentlicht in:Eye (London) 1999-01, Vol.13 (1), p.35-37
Hauptverfasser: Mok, Kwok Hei, Wong, Carrie Siu-Ling, Lee, Vincent Wing-Hong
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0950-222X
1476-5454
DOI:10.1038/eye.1999.7