48
PD = pupillary distance
HT = inclination of the line connecting the centres of the two pupils, referred to the
ground
Axis angles are expressed according to TABO system.
Numbers for “Pupil” and for “Gaze” represent, for OD and OS respectively, pupil diameters
and horizontal and vertical (in this order) offset angles of the average position of the corneal
reflex on respect of the centre of the detected pupil.
The Gaze is also graphically depicted for each eye in the two bottom corners of the display
in the form of a cloud of dots and an averaging cross inside two concentric blue circles.
When the cross is inside the smaller circle, the attention of the patient was high enough
during the examination.
In case of high Gaze values (cross outside inner circle) and collaborative patient, it is
recommended to repeat the exam after instructing again the patient about the need to stare
at the device, or, further, performing a monocular exam for each eye.
From the measurement screen the options are:
• Press and hold print button to save data to SD memory card and/or sent data to IrDA
printer (see Print paragraph);
• Press print button to make a ZOOM on the patient eye, move from the left to the right
simply switching with the right and left arrows of the joystick.
• Press S1 or S2 button (START BUTTON) to start a new measurement;
• Press C or D BUTTONs to change device setup for the next measurement;
• Press CENTRAL BUTTON to enter MENU (see Menu paragraph)
• Press LEFT BUTTON to recall last valid measurement performed (in case of invalid,
uncompleted measurement).
• Press RIGHT BUTTON for auxiliary window results, in normal 2WIN activities this will
bring to the amblyopia screening table.
• long left push: activates keyboard to insert patient name and date of birth: ACTIVE
KEYBOARD MODE.
• Long press RIGHT BUTTON: Screening Mode. Selection of age interval: push
right/left/up/down to switch between 'Ok' button, 'Cancel' button and the list of age
intervals. Press the centre button to select the item highlighted (N.B. If the date of
birth has been already inserted, then the age interval is automatically set). Push “Ok”
to save the choice.
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