Be careful of anti-fog. If you have an anti-scratch, anti-reflective, or other coatings on your lenses, it could damage it. Just read the anti-fog spray info before using.
I looked for the ones I got off Etsy, but she quit making them. Good wire at the nose is key to prevent fogging. I also find the behind the head works better for son and I who wear glasses. It creates a tighter seal, along with the nose clip, to cut down on fogging. Also, behind the head straps don't tend to bother our ears as much as over the ear ones and stay on better. I can't find a decent over the ear that will stay on well for me. They either slip off or bend an ear down and pop off.
Behind the head straps are perfectly acceptable and allowed at Disney and Universal. Have worn them for 2 trip now. In fact, N95, the ones medical personnel use, are behind the head; whereas, KN95, not medically approved, are over the ear. Behind the head straps tend to create a tighter seal, which prevents air leakage.