0 a device that takes a picture of visual information and changes it into a form that a computer can store and show on its screen:
The optical reader scans number plates and compares them against stolen vehicles.
Optical data readers can be used to scan a document and make sense of the patterns it finds within the document.
Some devices, such as optical mark readers, enable data to be entered directly, without human intervention.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.