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Customization
To insert a custom table (in order to follow regional or different rules compared to the AAPOS
ones), a file 'screeningTable.txt' has to be written and inserted in the SD memory card.
Data must be written in the first six lines of the file. Each line corresponds to an age interval
(maximum six intervals). The age intervals are fixed, while it is possible to modify the
thresholds values.
The columns correspond to the following entries:
Minimum age, Maximum age: age interval
Hyperopia, Myopia, Astigmatism, Anisometropia, Anisocoria, Gaze: numerical thresholds
A measurement is considered positive (the screening is passed) if the value is compliant to
the following thresholds:
Hyperopia: the measured spherical value on all meridians must be lower than this threshold
[in Measurement>Screening>Threshold Settings there are three possibilities: (a) Screen
Min Axis, (b) Screen Max Axis, (c) Screen Displayed]
(a) Screen Min Axis: you are measuring with a notation that minimize the sphere –
this mode is independent by how the data is displayed;
(b) Screen Max Axis: you are measuring using a notation that maximize the sphere -
sphere –this mode is independent by how the data is displayed;
(c) Screen Displayed: you are measuring what you see on screen - this mode is
dependent by how the data is displayed;
Myopia: the measured spherical value on all meridians must be lower than this threshold [in
Measurement>Settings>Threshold there are three possibilities: (a) Screen Min Axis, (b)
Screen Max Axis, (c) Screen Displayed]
Astigmatism: the measure of the absolute value of the cylinder must be lower than this
threshold
Anisometropia: the difference between absolute value of myopia or astigmatism between
the two eyes must be lower than this threshold
Anisocoria: the difference between the two pupil diameters must be lower than the threshold
Gaze: if a single eye is measured, the mean gaze position, measured in x and y degrees,
must be lower than this threshold. If both eyes are measured, the evaluation for warning
conditions is performed only on the difference of these values. In other words, the distance
between the two horizontal and vertical Purkinje reflections, normalized to the center, must
lower than the threshold.
The following as an example:
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