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13912-101 Rev. B
Measurements with the AT555 are made within a few milliseconds after the instrument “puffs”
the eye. Since this measurement cycle is so short, IOP readings can be acquired at different times
within a cardiac pulse period. Therefore, repetitive readings for an eye may fluctuate from 2 to 4
mmHg during this cardiac period.
Occasionally a reading greater than 4 mmHg may be shown (referred to as a “flier”) due to patient
movement or other reasons. The AT555 distinguishes these readings by putting brackets around
the value, as shown on the screen below.
Note: If a reading is surrounded by brackets (a “flier”), it will be used in the computation
of the average value and cause the average value to be out of range from the non-
bracket readings. If a fourth measurement is taken, the AT555 will automatically
replace the “flier.”
Instructions for Use (Continued)
Low Confidence Readings (Continued)
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