Theo repeated the incantation over and over in his head and out loud, for a further five minutes, until he was 100% sure that it was glued in his brain. He still wasn't keen on the spell, though. Oculo Focalis. Easy enough.
PHHHHEWWWWW!BREATHE. He picked up his wand and positioned himself in front of the eyesight chart again so that he was standing far away enough. Theo pointed his wand at his eyes and...

And....

AND.....

"Oc-ccc-ccc..."

Nope, can't do it.

He dropped his wand on the ground and stared blankly at it for a moment. Did he mean to drop it like that? It seemed to be his hands trying to tell him something. Errrrr, probably telling him to never EVER to point wands at eyes. Theo picked it up and checked all around him to see if anyone saw.