If it's material created before the lecture, get accessibility services to transcribe a copy before the lecture (they usually need around a week of lead time.... it's annoying, but it's the way things are).

I've been doing accessible digital transcripton for a while now, and can also do it a little more last minute (private company), but I am in Canada, so not sure if that comlplicates things. Interested in what ends up working; I have a friend experiencing similar things and I transcribe for 3 of her classes right now (advanced computer science and math equaions).

It could definitely help if you spoke with your professor - especially if they are unaware of your situation. If you are already working with disability services they should be able to help you navigate that conversation if you need it. Saying an equation out loud and being more verbally descriptive is definitely a strategy that could help. Pointing or saying "this equation here" are less helpful. It is entirely possible that more people in the class could benefit besides yourself. The professor might not know that it is hard to see what is going on. If they are using a document camera and have pre-made material, you could ask for a copy of that material to review at your seat (either digitally or as a paper copy). If they are writing things during class, you could ask that they use a darker pen or marker and write larger so equations or diagrams are easier to read. Some document cameras have the ability to take pictures of what is projected - you could also ask if that is an option. Or you could take photos during class to review later or ask to meet during office hours to review material. Best case scenario your professor will be eager to help and open to suggestions on how to do that. They might just need some prompting to make small changes to their current teaching style.