When we ride a bike too fast why do tears fall from our eyes. What is going on biologically and what may the evolutionary story be behind this?

This quora Q&A gives a few ideas, none of which satisfy my question fully.

  1. This is similar to a response to smoke.
    • But this is clean air? Why doesn't this happen all the time?
  2. Our eyes always need to be lubricated.
    • But why the need for excess tears?

1 Answer 1


Our eyes need to be covered with a thin film of liquid all the time. When riding fast, the wind flow pushes the liquid away from your cornea. Your eye compensates for that by producing more tear.


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