I think sospans reference to sacadic eye movement seems the most plausible explanation to the classic "sorry didn't see you mate" scenario.
My brother, a taxi driver proud of his vigilance, knocked a cyclist off his bike pulling out of a T junction some time ago. We discussed the event in depth later down the pub. Mitigating factors were the broad blind spot from the shallow angle screen pillar of his Renault C5, but we agreed the speed and duration of his right left scan particularly at a familiar junction close to home, was the route cause of missing seeing the cyclist.
With advancing age I find myself gradually easing out of awkward rural junctions and doing a double take on my scan nowadays.
2018 Roadster - Red/Magnolia - "Morton" 1966 Land Rover series 2a SWB 1945 Moto Guzzi Airone