This collapse came about because of the process of modernization. The reading is about how modernity has transformed vision.
The camera obscura was a powerful apparatus that was in use for centuries and observers relied on it very much. Camera obscura turned into a model that was elaborated in many ways. However being overtaken by modernity it collapsed during the 18th and 19th centuries. Some of the things that made it to be overtaken with time were its rigidity, the fixed positions, linear optical system, identification of object and perception among other things which were inflexible. A better observer was needed to replace the camera obscura. With the collapse of the model there arose many different human vision models. The human body plays an important role sinmce it is the carrier of vision. Camera obscura was a way through which a person could know about the world by perceiving using his mind. This was therefore a crucial apparatus whose collapse was not expected but had to come with changing times (Crary