February 1977
Volume 16, Issue 2
Articles  |   February 1977
Radio telemetry of intraocular pressure in vitro.
Investigative Ophthalmology & Visual Science February 1977, Vol.16, 168-171. doi:
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      R L Cooper, D Beale; Radio telemetry of intraocular pressure in vitro.. Invest. Ophthalmol. Vis. Sci. 1977;16(2):168-171.

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      © ARVO (1962-2015); The Authors (2016-present)

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A guard ring pressure transensor, using the principles of surface applanation, was used to transmit intraocular pressure (IOP) from a cadaver canine eye. The transensor consisted of a passive resonant coil/capacitor combination, made pressure sensitive by the movement of a small ferrite plate which acted as its applanating surface. Oscillation induced in the transensor by a remote grid dip oscillator (GDO) was monitored by a digital frequency counter (DFC). The resonant frequency of oscillation in the transensor bore a linear relationship to the in vitro IOP in three separate experiments (coefficient of determination for linear regression, r2 equals 0.90). These data indicate that radio telemetry is feasible, using a miniature applanating passive radio telemetric device for continual monitoring of IOP.


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