Fort Worth, Texas ? Kenny Perry is having vision problems that make it difficult for him to read greens or see clearly from long distances and shady spots.

Yet, Perry is so comfortable playing at the Colonial that he’s still in the lead by three strokes with a tournament-record score after two rounds.

Perry shot a bogey-free 7-under 63 on Friday for his best round of the year, moving to 12-under 128. That is the 36-hole scoring record at Colonial, where Perry also holds the overall scoring record of 19 under for his 2003 victory.

D.J. Trahan (67) and Ted Purdy (65), whose first PGA Tour victory came last week at the Byron Nelson Championship, were tied for second at 9 under. Kirk Triplett was another stroke back in fourth after his second straight 66.

First-round leader Patrick Sheehan was 10 strokes worse Friday, a 72 following a 62 that gave him a two-stroke lead. Sheehan goes into the weekend six strokes back.