England's Justin Hollingsworth was threatening with every delivery and the 19-year-old was the standout of the bowling unit, taking two critical wickets.
Hollingsworth and Dean opened the batting for England with an impressive stand of 175 off 25.4 overs to put England in a strong position before Hollingsworth's lbw dismissal for 76.
T20 captain Luke Sugg came in to build the chase with Dean after Pete Blueitt was run out for two.
Needing 20 off the last four overs to seal the win, Sugg and Dean put on a 107-partnership to secure the result in the 38th over, with Dean hitting the winning runs and carrying his bat on 96.
Reflecting on the match, Dean said: “Obviously it is always pleasing to have a man-of-the-match performance to help your team win, but today was a real team effort.
“Everyone was involved in the field to make sure Australia only scored 285 and we gave a very mature performance chasing down that total.”
The captain was philosophical about his almost-century: “I never worry about my score, I just bat for the team and was more worried about making sure we got over the line.
“I was happy I managed to carry my bat and am now looking forward to the next game tomorrow.”
England Visually Impaired team
Matt Dean (captain)