If the reader is calibrated and tested to be as good as a trained human with perfect eyesight, that seems better on average than relying on untrained humans wit

If the reader is calibrated and tested to be as good as a trained human with perfect eyesight, that seems better on average than relying on untrained humans with unknown eyesight. Heck, it could even be better as it would be able to supply a controlled lighting condition by measuring off a known LED.