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• T = is the minimum pupil diameter limit threshold. If during the 4 calibrating intensities
of light the pupil diameter of any patient pupil goes under this value, then during the
last and final measurement phase the 2WIN will use the corresponding light intensity
that caused that specific threshold crossing.
• M = multiplication factor of the calibration impulse
• P = is the desired percentage of pupil diameter variation
The four calibration intensities are written in the configuration file with A,B,C,D letters.
A,B,C,D values must be placed in ascending order.
The 2WIN during this calibration mode will start the exam with a starting 1 second of dark
condition, then it will switch between the 4 A,B,C,D calibration intensities, each of them
turned on for 1 second).
If the pupil diameter percentage variation is greater than the P parameter or if the minimum
pupil diameter is lower than T parameter then 2WIN will store the intensity value (one of the
A,B,C,D) that caused on of the above conditional pupil reaction (T or P parameter). This
value will be used to illuminate the patient in the final phase of the measurement.
Example (pupilresponse.txt) file in the SD 2WIN card:
T4.2
P15
M1.5
A8
B16
C32
D64
In this example the 4 light intensities at the beginning of the measurement will be 8%, 16%,
32% and finally 64% of the maximum light intensity. At the end of the measurement it will be
used a final light impulse that will cause a pupil diameter lower than 4.2 mm or will create a
percentage pupil variation that will overcome the 15% value, multiplied finally by a factor of
1.5.
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