Icare^® rebound tonometers: review of their characteristics and ease of use

Figures & data

Figure 1 Icare^® TA01i.

Notes: (A) Overview. (B) Measurements for children. Icare TA01i is the most flexible among the four Icare series tonometers because we can measure IOP at various angles. (C) Display shown with IOP.
Abbreviation: IOP, intraocular pressure.

Figure 2 Probes used in Icare^® series.

Note: The short probe is only for Icare^® PRO, and the long probe is for Icare^® TA01i, Icare^® HOME, and Icare^® ic100.

Figure 3 Icare® PRO.

Note: (A) Overview and (B) display panel shown with IOP values and measurement validity with color (green, yellow, and red).

Figure 4 Icare HOME.

Notes: (A) Overview. (B) Green light seen by patients during IOP measurement. (C) Display panel shown with messages.
Abbreviation: IOP, intraocular pressure.

Figure 5 Icare ic100.

Notes: (A) Overview. The green light indicates that the sensor recognizes the position is upright. (B) Color display shown with IOP and validity of measurements (superior, IOP and blue circle means it is the second IOP measurement among six; middle, IOP value after six measurements with a caution [yellow circle]; and inferior results, “repeat”).
Abbreviation: IOP, intraocular pressure.

Figure 6 (A) Box plots with mean IOP of Icare ic100 and GAT. IOP was significantly lower with the Icare ic100 than with GAT by about 2.5 mmHg. (B) Scatterplot of IOPs from Icare ic100 and GAT.

Table 1 Characteristics of Icare rebound tonometers

	Icare TA01i	Icare PRO	Icare HOME	Icare ic100
Released (year)	2003	2010	2014	2016
Probe	Long	Short	Long	Long
IOP display	○	○	Connecting PC	○
Position sensor	–	○	○	○
Sitting position	○	○	○	○
Supine position	–	⊚	–	–
Lateral position	○	○	○	○
Self/home tonometry	–	–	⊚	–
For children/handicapped patients
Sitting (awake)	⊚	○	–	○
Supine (sleeping)	–	⊚	–	–
Bland–Altman plots
Mean IOP difference between GAT	Slightly higher in younger patients	Close to GAT	Slightly lower measured by both self and others	Maybe slightly lower
Reported width of 95% LOA to GAT (mmHg)	8.93–11.38	5.2–9.4	7.31–14.59	10.84

Note: ○= appropriate to use. ⊚ = more appropriate to use.

Abbreviations: GAT, Goldmann applanation tonometer; IOP, intraocular pressure; LOA, limits of agreement; PC, personal computer.