The Edinburgh back has been a key component of a Dark Blue attack that leads the way in terms of championship tries so far. The Scots notched up two touchdowns in their opening-day defeat to England before running in another four in their 34-10 success over Italy last time out, but Scotland struggled to develop quick ball to their pacy runners.
The Dutch-born player, who has along with fellow wing Sean Maitland and full-back Stuart Hogg contributed four tries as part of a potent back three, said: "Against some of the other teams in the Six Nations, we will get it a lot tougher and if we don't get these fundamentals right, we won't be able to score those tries."
He added: "It's a vast improvement from where we have been in the past in terms of finishing. It's good to see that right across the back three but it is perhaps disguising where we are as a team.
"We need to look at the fundamentals of our game. We need to look at the tackle contests, our defence, our breakdown. Those are all important areas we need to improve on.
"We are making up for that by scoring tries, which is never a bad thing, but to become a more better side we need to look at those fundamentals.
"But the Italy performance was a good first step. We scored a lot of tries and the scoreboard looked brilliant."
Ireland visit Murrayfield this Sunday looking to extend a run of victories that stretches back to their only Edinburgh defeat of the Six Nations-era in 2001.
Visser, though, is unconcerned by what the record books say.
"The past is the past," he said. "We can't do anything about that. A lot of the players in this squad were not in those sides. Whatever happened in the past has nothing to do with what we can do in the future."
- Sports & Recreation