Intraocular pressure measurements in relation to head position and through soft contact lenses: Comparison of three portable instruments

Ainat Klein*, Gabi Shemesh, Anat Loewenstein, Shimon Kurtz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

■ BACKGROUND AND OBJECTIVE: To compare the reproducibility of three portable instruments - the Tono-Pen tonometer (Reichert Ophthalmic Instruments, Depew, NY), the Phosphene tonometer (Bausch & Lomb, Rochester, NY), and the TERT (Through Eyelid Russian Tonometer; Rjazan State Instrument Making, Rjazan, Russia) - in the measurement of intraocular pressure (IOP) with and without soft contact lenses and in different head positions. ■ PATIENTS AND METHODS: Twenty-six eyes of healthy volunteers were examined by the three instruments while the subjects were sitting, recumbent, and hyperextending their heads, and with and without contact lenses. IOP measurements were compared and the effects of head position and presence of contact lenses on the resultant values were analyzed. ■ RESULTS: The average difference between the recumbent and sitting positions was 3.56, 2.68, and 2.62 mm Hg for the Tono-Pen tonometer, Phosphene tonometer, and TERT, respectively. There was an increase of 5.60, 2.78, and 2.63 mm Hg in hyperextension compared to sitting for the Tono-Pen tonometer, Phosphene tonometer, and TERT, respectively. The difference in the IOP values obtained in the presence and absence of therapeutic contact lens for the three instruments in the three positions was between -1.23 and +1.47 mm Hg. ■ CONCLUSION: IOP measurements of bedridden patients are only slightly higher than those of sitting patients except for the Tono-Pen tonometer in the hyperextension position. The presence of contact lenses does not affect IOP values obtained by the three evaluated instruments.

Original languageEnglish
Pages (from-to)64-71
Number of pages8
JournalOphthalmic Surgery Lasers and Imaging
Volume42
Issue number1
DOIs
StatePublished - Jan 2011

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