Each device calculates the final IOP measurement by discarding the highest and lowest readings and displaying the average of the remaining 4 readings. Both Icare ic100 and Icare HOME also have a 'series' mode, in which the user only needs to press the 'measurement' button once and keep the button pressed down to activate 6 automatic measurements. The user must press the 'measurement' button to perform 1 individual IOP measurement. The IOP reading is based on 6 individual readings (1 measurement sequence, which takes about 2 seconds). The person taking the measurements can move the forehead support by turning the adjustment wheel to ensure the probe is correctly positioned. The distance between the tip of the probe and the cornea should be 4–8 mm for Icare TA01i, Icare ic100 and Icare HOME and 3–7 mm for Icare PRO. The forehead support should be positioned against the forehead. The person looks straight ahead and the tonometer is brought close to the eye with the probe perpendicular to the centre of the cornea. The person is positioned appropriately according to the tonometer in use: standing or sitting for all devices, or supine for Icare PRO only. A new single‑patient use probe is inserted into the probe base and the button is pressed again to activate the probe. The tonometer is switched on by pressing the 'measurement' button (or 'main' button for Icare PRO). Rechargeable internal lithium‑ion battery User can manually select 'left' or 'right' depending on which eye is being measuredĪutomatic eye recognition to identify left or right eye Red light on probe base for incorrect positioning or green light for correct positioning Two short beeps and an error message on the display Notification of incorrect device position Standing, sitting or lying down in the supine position Position of the person during the measurement USB port for data transfer to PC with Icare LINK software Monochromatic 7‑digit liquid crystal display (LCD)ġ28×128 pixel organic light‑emitting diode (OLED) display Icare LINK software can be installed on the computer and used by healthcare professionals to transfer, analyse and store measurement data from the handheld device. Icare PRO and Icare HOME can be connected to a computer. Icare HOME is also supplied with a carrying case. Several additional accessories are supplied with each model, including a USB cable and a USB memory stick with Icare LINK software for the Icare PRO and Icare HOME, and a USB charger (for rechargeable battery) for the Icare PRO. The probes are disposable and must be changed for each patient, but can be used for both eyes assuming there is no eye infection. Each model has a built‑in adjustable forehead support and is supplied with single‑patient use probes, a spare probe base and a container for cleaning the probe base (recommended every 3–6 months). There are 4 Icare models, all of which use the same rebound technology: Icare TA01i, Icare ic100, Icare PRO and Icare HOME (previously known as Icare ONE see table 1). They assess the deceleration and rebound time of a small, lightweight probe, which makes brief contact with the cornea and can be used without local anaesthesia. Icare tonometers are portable, handheld devices used to measure IOP.
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