Healing Environment and EBD (Evidence Based Design at Agha Khan Hospital, Karachi, The permission is been secured from AKU public Relation office and drawing have been provided by Payette Boston. Room assistance were administered by the secretary at the day care center to secure permission to use images of the AKU interior of the day care ward. The radiation penetration calculation through a Ambulatory day care skylight at Agha Khan Hospital. This research has taken into account analysis of ecological hospital designed with considerations of sun light from the window, and the efficiency with consideration to the Vitamin E; at Agha Khan Hospital in Pakistan, which has been examined in regard with window design and radiation penetration. “A window design, can provide same or even more (i.e. variable degree) level of comfort (vitamin E) for hospital buildings as that of high energy consumption hospitals”. As we all know that Sun is the brightest star in the solar system. It gives us light which is a valuable source of heat energy. It can be considered as the ‘life blood’ for all living things on the planet and without which, almost all the living organisms would fail to exist.