New Zealand batsman Ross Taylor believes having an eye procedure before the second cricket test against Australia probably helped in his record breaking innings.
"I had to have an eye test, I couldn't really see the ball. I have a pterygium in my left eye so the eye drops obviously worked."
Taylor's 290 was the highest score by a visitor on Australian soil.
Australia will start the fifth day of the second test in Perth on 258 for 2 in their second innings - a lead of 193 runs.
Taylor said he suffers from a dry eye condition which he thinks affected his performance in the first test, so he got medical treatment.
Pterygium is a common eye condition that affects people who spend a lot of time outdoors.
Taylor batted for almost nine-and-a-half hours and his 290 included 43 fours.
Australia will resume on day five today (3.30pm NZ time) with Steve Smith on 131 and Adam Voges on 101.