Give me a break here: If its a bright sunny day and you have to squint wear a hat and sunglasses. Anytime a fair complected person migh sunburn then eye protection is ideal.
JCH MD
so how would you define heavy indirect sunlight?
Or what conditions are acceptable without wearing sunglasses? Anywhere where it's shaded?
1. What is dangerous IS STARING DIRECTLY AT THE SUN. THAT WILL BURN OUT YOUR MACULA.
2. What is not good for the eye is many years of heavy indirect sunlight exposure: this increases the risk of cataract, marcular degeneration, pinguecula, ptyergia and eyelid skin cancers.
JCH MD