Martial Geiser discovered the Delano diagram in 1984 after the visit of John Rogers at Kern & Co in Aarau. Since that time, he became enthusiastic about that simple and truly ingenious way to look at an optical system. He used it in many occasions, used the first y-ybar software written by Roland Shack on DOS. He started with students project to develop a graphical interface and ended with this web interface for y-ybar calculation. Such results come never out of one person:

• Tilman Stuhlinger for the numerous discussion over the last twenty years.
• Roland Shack for the many explanations I got during my stay in Tucson many years ago.
• Eric Logean and Sylvain Boley for their help to write down what the software should do.
• Hartmut Schmidt for all the discussions and the opportunities I got to teach the y-ybar in Germany.
• Yves Putallaz for the very first application running on Window with visual basic.
• Loic Haenni, a student for the first application on the web.
• Alexandre Cotting, a professor of informatics.
• Sylvain Roh for the numerous changes and adaptation to run smoothly the application on the web.