If you have trouble with glasses steaming up you can try various things. Wipe the lenses with a tiny drop of liquid handwash - not washing up liquid, it can damage the coating - and wipe dry with a spectacle cloth or microfibre cloth, not paper towel as that will scratch. You can wipe the lenses with a drop of hand santitiser gel. You can get anti-fog spray from Amazon, or probably from your optician, maybe chemists sell it.
If the mask has a nose wire, pinch it close to your nose and wear your glasses over the top. It helps to fold the top half-inch of the mask inwards, you can still pinch it onto your nose. Or take a strip of paper tissue and tape it along the top edge of the mask with micropore or sellotape.
If you're worried about feeling claustrophobic take it slowly, wear a mask for five minutes at a time around the house. You won't need to wash or replace it each time when it's only for a few minutes. Build up slowly. You only need to wear them on public transport or inside stores, carry it in a clean plastic bag and put it on just before you go through the door. How long does it take to do a supermarket shop? Half an hour? Surgeons wear them for hours in theatre, it honestly isn't going to be as bad as you imagine.
Remember if you dread a mask, you're really not going to want to wear a ventilator.
