He doesn't look like he's in pain when reading

My husband and I have noticed a difference since the children got their Irlen spectacles.

Ewan is now doing his homework which was impossible before, he doesn't look like he's in pain when reading and reads more at home. His teacher said its hard to tell but he is finally progressing forward after a stalled couple of years.
Julia has increased her reading and is really enjoying her chapter books now. Her teacher said straight away that they're definitely making a difference.  

She's gone up a few reading levels and it is now pleasant to listen to her reading. She's fluent now where as she was very staggered before.