Great question — answering as the UphillTech team:
There is no visible or measurable variation in visibility that is based on whether you are looking west or east. There will be innumerable reasons why at a particular time on a particular day one person may have had better visibility than someone else, but that would be a long list of conditions including position of the sun, location, time, weather, local conditions, eye health of individuals, and so on.
Full answer by Rory Alsop: https://outdoors.stackexchange.com/a/29314 (CC BY-SA 4.0).
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