Actress Kate Walsh was visiting “Late Show with David Letterman” at the Ed Sullivan Theatre on Tuesday in New York City wearing the classy Barton Perreira ”Socialite” sunglass.  Barton Perreira is a new line of optical and sunglasses targeted to the luxury market. They began about a year ago and have already become quite popular because of the experience of the founders, their popularity among celebrities and the simple beauty of the shape, style and design. The company was founded by Patty Perreira and Bill Barton who formerly designed frames for the eyewear powerhouse Oliver Peoples. Many of the Barton Perreira frames are made from titanium, while others are hand-made zyl.