I'm sorry to say that there isn't a magic trick to deal with the high altitude sun reflected off of glaciers, but there are a number of products and strategies you can use to good effect. FWIW, I was a competitive swimmer and lifeguard, so I spent a lot of time out in the sun when I was younger. I never sunburned even though I eschewed sunblock. The first time I climbed a glacier in college, (Mt. Baker), I got sunburned so badly I ended up with a horrible case of cold sores that covered my mouth. (Cold sores are caused by herpes viruses that stay dormant in your neural dendrites until they are 'activated' by exposure to UV radiation or some other mechanism). That was the day before I met my girlfriend's parents for the first time, and boy was she pissed. Not only was I as red as a boiled lobster, I had a super nasty case of herpes all over my mouth. Not the impression she wanted me to make. But, like I said there are strategies you can employ to mitigate your exposure to harmful UV radiation
1. A good hat. I personally prefer a Bay Six, white mesh cap
http://www.tennis-warehouse.com/Bay_Six_No-Logo_Hat_White/descpageUNIQUE-KENUC.html. The brim is large and darker colored on the underside to reduce albedo radiation. I will often tuck a bandanna under the back, as a cape, to protect my neck. Sequel used to make the Desert Rat Hat, which had a removable neck cape (attached by Velcro) which also closed in front (with Velcro). The cape is lose fitting, so you shouldn't have any breathing problems. They look fairly ridiculous, but work well. Unfortunately, Sequel is no longer in business but I suspect you could find one on Ebay or something. You could achieve the same effect with a large, white bandanna and a small safety pin. Or, you could make a bold fashion statement and go with a straw cowboy hat.
2. Good sunblock that doesn't sweat off. I prefer Aloe Gator SPF 40+ in the gel form.
https://www.amazon.com/Aloe-Gator-SPF-40-Gel/dp/B001OPH3CI?th=1&psc=1 The gel is less irritating to my sensitive skin, and does not sweat off and end up in my eyes like every other lotion type of sunscreen. Available in 1 oz., 2oz., 4 oz., and 8 oz. sizes. I like the 2 oz. size because it is so lightweight and it fits in the chest pocket of my wind shirt, which keeps the gel from becoming too thick from cold weather. I worked as a lifeguard in the summers and Bullfrog brand was very popular with the other lifeguards due to its water resistance. Available up to SPF 50+.
https://www.campmor.com/c/bullfrog-water-sport-lotion-spf-50-h11745oz?gclid=CI6l24WE3NMCFQ6bfgod0tkDeA3. Sunblock lip balm. In as high an SPF as you can find. Zinc oxide was popular with the lifeguards for the nose and lips and is available in SP 50.
https://jet.com/product/detail/f3c36a32b634483d875752e63a2cebd1?jcmp=pla:ggl:NJ_cons_Gen_Health__Beauty_a3:Health__Beauty_Skin_Care_Sun_Care_a3:na:PLA_786070203_37816626461_pla-307606444263:na:na:na:2&code=PLA15&gclid=CJOUgoKD3NMCFYOKfgod3UwCMQ. I use Banana Boat brand lip balm, SPF 30, which does the trick for me.
4. A nose guard with your glacier glasses. I made my own from SAM splint material. And hey, Colin Haley uses one so there you go.
5. Climb at night and be off the glacier before the sun rises too high in the sky. When I alpine climb I aim to leave high camp at 2:00 AM. The guide services often aim for midnight.
6. Apply sunblock before you need it. Right before you start the approach at the parking lot, when you get up in the middle of the night to start your climb, before the sun rises.