PHILADELPHIA (973espn.com) - Patrick Robinson has surfaced as his own worst critic.

The veteran cornerback, who signed with the Eagles as a free agent in the offseason, described his day on the practice field Tuesday as "terrible."

The former first-round pick was particularly upset at getting beaten deep by camp star Marcus Johnson on two different occasions.

“It was a terrible day for me," Robinson surmised while talking to reporters after practice. "It was terrible."

When asked by 973espn.com why he was being so hard on himself Robinson pointed to the explosive plays by Johnson, the kind of quick strikes that can cripple a defense.

"I gave up two deep balls,” Robinson explained. “That’s a huge no-no. When you give up that deep ball, that’s a huge blow for our team. You don’t give up a deep ball. That’s a problem for a defense.”

Maybe the top trait for any cornerback in this league is a short memory and Robinson, who will turn 30 in September, understands he can't let this kind of thing linger.

"We (the secondary) got a lot of expectations for ourselves, and I didn’t have a good day," he said. "But it’s camp. Sometimes you’re going to have some days like that, but you have to bounce back. You have to keep going. Especially as a DB. You have to bounce back."

Robinson admitted the drastic change in weather affected him. For the most part, the Eagles have enjoyed unseasonably cool and cloudy skies this summer until the 90s and humidity returned to the NovaCare Complex on Tuesday.

“I got a little fatigued and it got the best of me,” Robinson admitted. “That’s something I have to work on, being in great shape, having great technique the whole practice, not sometimes, not every now and then. You have to have great technique for the whole practice.”

Robinson was harsher than his own head coach, however, as Doug Pederson praised the Florida State product after watching the same practice.

“I've seen some really good strides understanding Jim's [Eagles defensive coordinator Jim Schwartz] defense, how [Eagles defensive backs coach] Cory [Undlin] is teaching his drill work, his fundamentals," the coach claimed. "He's obviously taken it from OTAs right into camp. So I've seen a lot of improvement there. (I’m) excited to watch him live."

The Eagles' WRs have dominated the CBs early in camp but with Alshon Jeffery (shoulder) and Torrey Smith (back spasms) sitting out Tuesday, reserves like Johnson, Nelson Agholor, and Mack Hollins got chances on the outside and the offense wasn't quite as dominant as a whole.

To date, Robinson has been running with the first team at right cornerback opposite Jalen Mills with rookie third-round pick Rasul Douglas as his backup.

Douglas, who has struggled early in camp, made some noise Tuesday by intercepting Carson Wentz in a live period of practice.

“We're constantly looking to bring in guys to compete," Pederson said when discussing the CB position as a whole. "But I like where we're at right now. These guys know, and everybody knows, we have to get better. We have to continue to compete. I thought (Tuesday) was another step in that direction.”

-John McMullen covers the Eagles and the NFL for 973espn.com. You can reach him at jmcmullen44@gmail.com or on Twitter @JFMcMullen