The Tono-Pen AVIA Vet tonometer is an ergonomic, hand-held tonometer that measures intraocular pressure.
The body of the instrument is designed to fit comfortably in the user’s hand, facilitating fast and accurate measurements. The tip of the tonometer contains a sensor that houses a transducer assembly which converts applied force into an electrical signal. The electronics housed in the ergonomic Tono-Pen AVIA Vet tonometer body process and analyze the waveforms produced by each applanation of the corneal surface of the eye. These are used to produce an averaged IOP measurement. The measurement is displayed on the Liquid Crystal Displays (LCDs). A replaceable battery compartment houses the Tono-Pen AVIA Vet POWERCEL battery pack, consisting of two Lithium Manganese Dioxide batteries.
The Tono-Pen AVIA Vet tonometer has the following features:
• Easy to use – IOP can be measured reliably by veterinary professionals.
• Portable – The Tono-Pen AVIA Vet tonometer weighs just 71 g (2.4 oz) and is battery operated.
• Accurate – The measurements from the Tono-Pen AVIA Vet tonometer correlate strongly with Goldmann applanation tonometry and direct measurements of IOP.
• Versatile – The Tono-Pen AVIA Vet tonometer may be used easily with the patient in any position, making the instrument suitable for the office and in remote locations.
1. Instill a drop of topical anesthetic into the eye to be examined.
2. Position the patient, seated or supine, in front of a fixation target.
3. Where possible, instruct the patient to look straight ahead at the fixation target (i.e. ear, nose, distant object) to minimize eye movement, with eyes fully open.
4. Hold the Tono-Pen AVIA Vet tonometer as you would a pencil and position yourself to allow viewing of the Transducer Assembly and the patient’s cornea where contact will be made. For normal corneas, central corneal contact is recommended.
5. The corneal surface needs only to be momentarily contacted. Indentation or additional pressure is not required and may lead to injury to the eye.
6. Brace the heel of your hand on the patient’s cheek for stability while holding The Tono-Pen AVIA Vet tonometer perpendicular to and within approximately 1.3 cm (1/2”) of the patient’s cornea.
1. Press and release the activation button once to initiate the applanation mode.
2. A brief display of “88888” will flash on the LCD, a double row of dashes “===” will be displayed, the green LED will turn on, and a “beep” tone will sound, indicating the Tono-Pen AVIA Vet tonometer is ready to measure intraocular pressure.
3. Tap very lightly and briefly on the corneal surface. The device will chirp and the DATA field on the LCD will increment for each valid IOP reading obtained.
4. When another beep tone is heard, indicating 10 applanations have been read, the green LED will turn OFF, and the averaged IOP measurement will appear on the LCD above “mmHg”. The statistical confidence indicator will appear on the LCD above DATA.
If 15 seconds elapse prior to applanation being initiated, the TonoPen AVIA Vet tonometer will initiate the Sleep Mode, indicated initially by the display of a single row of dashes “—”, followed by a blank display. The applanation mode may be initiated by pressing the activation button. If any error codes appear on the LCD after the final beep, the applanation procedure must be repeated.
During the measurement, the LCD shows the cumulative number of applanations detected. Once 10 applanations are achieved, the LCD will display the IOP in millimeters of mercury (mm Hg), along with a statistical confidence indicator. A statistical confidence indicator of 95 means that the standard deviation of the valid measurements is 5% or less of the number shown. The higher the statistical confidence indicator, the more reliable the measurement. If the statistical confidence indicator is 80 or 80-, a repeat measurement is recommended.
The Tono-Pen AVIA VET does not require daily calibration, however may on occasion ask for a quick operator calibration. This calibration can be performed in-clinic by any operator, in less than 15 seconds.
The device displays individual readings and the average of 6 readings along with a statistical confidence indicator, ensuring accurate, repeatable, and reliable tonometry results.
Sanitization is not required given the latex/plastic tip cover that is present upon measurement. These tip covers are single-use disposable, and are not intended to be used on more than one patient.