Very thorough & knowledgeable: spent a lot of time to thoroughly diagnose and prescribe a prism correction, employing techniques that I hadn't experienced before. Just got the new glasses, and they're great! Didn't realize how much I was straining until I didn't have to anymore. Thank you, Dr. Banh! You saw me at 20/20 in Santa Clara - I'm inferring you're no longer there :-( Best to you in your career!