Slow down?

It sure is a temptation to keep barreling through dappled light. It nearly ended badly for me when a deer crossed near me on a fast, fun descent.

Just as in a car or motorcycle at night - or when cresting a blind hill or taking a blind corner - the limiting factor on your speed needs to be, if something happens just beyond what I can see at this moment, will I be able to respond to it in time? That's partly about limiting speed, partly about heightening awareness, partly about developing skills. There's a classic article about this in motorcycling called "The Fridge Factor" - the gist of which is to ride as though just beyond the apex of that turn, in one lane there's a refrigerator, and in the other lane there's the pickup truck out of which the fridge just fell. It applies equally to any road user.

It's been a long time since I wore light-sensitive lenses, but I don't think they respond instantaneously even now. I'll totally take my glasses off when needed - or in the evenings, swap to a pair of amber lenses - but you don't want to be taking a hand off the bar and fumbling around in your jersey pocket in a critical situation.