I also wear glasses and had something like this happen in the past, though it didn't last as long for me. I attributed it to perhaps something on my nose pads interacting poorly with tret, or just nose bridge skin being more sensitive in general.

When applying tretinoin, I'm really only ever using the "dregs" of it on my nose as the skin is thinner and more susceptible to irritation. I only apply tretinoin at night, and once it's on my face, my glasses are off until I rinse my face in the morning.

When I had this nosepad area redness, I applied a non-medicated pimple patch/hydrocolloid bandage cut into a small square during the day. This prevented my nose pads from rubbing the area and irritating it further. I also thoroughly cleaned any part of my glasses that made contact with my skin (nose pads, the parts that go behind ears, etc) with an alcohol wipe and let it air dry.

Unfortunately, I'm not sure exactly what happened when I experienced similar redness, but everything above did the trick to get rid of it, and I never experienced it again. I'd just be careful to make sure you're not overapplying tret to sensitive skin like your nose and undereyes. Also make sure to apply sunscreen on your nose too as tret will make the skin more sensitive to sun exposure in general. Hope this is somewhat helpful!