JB,
Visual acuity stuff - I had to put unknown on mine...I had nothing on my prescription relating to all necessary stuff they ask for and it was fine. If you have to go for a medical (fingers crossed you do!) you'll have to provide a full report on your eyesight dated within the last 6 months.
Don't worry about not filling in the boxes with as many characters as they allow - I didn't.
As for your references, I'm sure you'll be fine with what you have provided....
Don't stress! You'll be fine!!
All the best to you
