This page is an entry in the Key.
“Optically generated” refers to an effect created by the physical optics of the camera or device (that is, its lens or lenses).
“Non-optically generated” refers to visual effects that were not generated by the physical optics of the camera or device.
Although it could refer to darkroom-generated effects, in the 21st century “non-optically generated” usually describes effects determined either by software in the device / smartphone / camera, or later — on a computer — using software like Photoshop.
There are many situations in which photographs made with “optically generated” effects can qualify as TCQ—
— while identical-looking photographs in which the effects were “non-optically generated” are disqualified from TCQ.
See the brief on def|pen for more.