Seeing

This is the ability to observe the immediate environment using our eyes. Naturally, visual physiology requires adequate light in order to effectively see or look at an object. Adequate light is also important for reading, watching TV and attending class lectures in a school. The physical structure of housing provides the required light through two sources: artificial light from electric sources and natural light through the windows from the sun. The minimum recommended light-admitting window area is similar to that for breathing.