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diabetes causes rapid vision change,retina changes are big problem (NPDR)
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Diabetes causes rapid vision change,retina changes are big problem (NPDR)
If it's PIR (that's passive infra-red) then think of it as an eye that can only see changes in heat, staring straight forward. Whenever something that's warmer or colder than the background moves in or out of its field-of-vision, the sensor reacts to this change in scenery and trips an alarm.
Machine vision system or optical barcode/matrix code reader.
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