300mW Laser Temperature Measurement
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A very quick test is to close your eyes and see if you have any afterimage from the exposure (similar to the afterimage caused by a camera flash, or the sun glinting off a reflective object.) Normally you should not have an afterimage, or it should fade in less than a minute. If you do have a longer-lasting afterimage, or any new spots in your visual field, you may wish to have an eye exam by an ophthalmologist or a retinal specialist. Even then, this is suggested only for an extraordinary exposure such as deliberately staring into the scanner, or if the scanner is suspected to be malfunctioning and is brighter than normal.
It would not be economical to require laser scanners to have additional safety features, such as eye detection (to turn off if they see an eye) or a direction detector (to turn off unless the laser is facing downwards). Between the low power of the laser itself, plus the added safety of a constantly-moving beam, an accidental or unwanted exposure is not hazardous.