I never have problems with sweat if I wear my contacts. When I do wear glasses: Posture. Don't look down when running. Pushups, look forward.
Also, don't wipe your face/head. That always seems to send all of the sweat directly into my eyes.
I ran a 50k race with ~7k feet of elevation gain yesterday. Cool in the morning, around 56 F. A little warm toward the end, around 85 F.
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