LEED certified buildings save money and resources and have a positive impact on the health of occupants, while promoting renewable, clean energy. LEED, or Leadership in Energy & Environmental Design, is a green building certification program that recognizes best-in-class building strategies and practices.he key to success is making sure you're using the right tools. LEED v4 is backed by a supporting cast of tools and resources. 1  Discover which LEED v4 rating system applies to your project. 2  Get started.
The Process of Sight. All vision is based on the perception of electromagnetic rays. These rays pass through the cornea in the form of light; the cornea focuses the rays as they enter the eye through the pupil, the black aperture at the front of the eye.
BiF14 HE LIGHT TOUCH Seeing in the light and in the dark T he human eye is remarkably sensi-tive. The first stage in the process of seeing is the absorption of light in cells called rods and cones, which lie in the retina, a thin sheet of tissue at the back of the eye. The retina records the image of the world around you somewhat like film does in a camera.