Ross Taylor was struggling to see the ball in New Zealand's first-Test defeat against Australia before a dose of eye drops enabled him to compile a record-breaking innings at the WACA.
Taylor's incredible knock of 290 in the second Test was the highest score by a visiting player in Australia, lasting 567 minutes and including 43 boundaries as the tourists made a mammoth 624 all out.
The 31-year-old was out for a duck and then made 26 at the Gabba, where Australia won the opening game of the three-match series by 208 runs.
Taylor had problems seeing the ball in his first game for his country following a lay-off after undergoing testicular surgery as a result of taking a painful blow on the tour of Zimbabwe.
The elegant right-hander had his eyes checked before the second Test in Perth and reaped the rewards.
"I had to get my eyes tested in between. I couldn't really see the ball so the eye drops obviously worked. I have a pterygium in my left eye and I do that a lot [opening his eyes].
"The optometrist said when it's dark you'll probably do this a lot [again opening his eyes] and I told the boys and they lost it because that's how they take the mickey out of me."
Taylor said a more relaxed preparation to the WACA Test has also paid dividends.
"I was out of the game for six weeks, I couldn't do anything," he said. "I was anxious, it's a big tour and we put a lot of pressure on ourselves and I wanted to do well and was a bit underdone and all at sea.
"I trained pretty hard leading in but sometimes when you try too hard you don't get the results. Leading into this I let it all go to see where it took me.
"I'd put too much pressure on myself so I just relaxed, got on the balls of my feet and played straight. Chalk and cheese from where I was a week ago."
Steve Smith (131 not out) and Adam Voges (101no) were unbeaten at stumps on day four to stretch Australia's lead to 193.