I can understand the difficulty you are experiencing.
I very much doubt that this would, however, be grounds for being off during treatment. Of course, your employer might be willing to give you the time off (with or without pay) if you asked.
One thing you could do would be to fashion side shields for your glasses using any sort of material from paper, cardboard, fabric etc. You should be able to wear your modified normal Rx glasses as almost every set of eyeglasses block UV light now a days.
They also make large, wrap around, UV blocking glasses that fit over prescription glasses. Talk to a local ophthalmologist and see what she has available. These glasses are usually very inexpensive. In my practice the post op glasses, which I give to patients for free after surgery, block UV light and fit over glasses. An eye surgeon may give you a pair for free or just a pound or two.
Make sense to you?
It's safe for you to press the positive feedback button now if you so desire. And, never fear, even after you press that button I'll still be right here to continue helping you, but, as I do work for tips, I want to make sure you are happy before rating me.
Dr. Rick MD FACS