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.
The Eye and the Sense of Sight. We perceive shapes, distance, movement, color, heat and depth by our sense of sight. The organ for the sense of sight is the eye, about the shape of a ping-pong ball. The eye alone cannot make sight possible. It works with the brain and on the outside, needs light to be present. First, let us see what the eye is made up of and then look closer at how it works.