What are the four foundation elements of supply chain management? The four foundation elements of supply chain management are  purchasing, production, logistics and processing or collaboration  between trading partners.
Short-sightedness (myopia) Other people have eyes that are too long, so the light focuses in front of the retina (they are short-sighted). This means that they cannot see things clearly if they are far away from them (such as the TV or board at school).
Hyperopia, also known as farsightedness, is a condition in which nearby objects appear out of focus. Hyperopia occurs when the eyeball is too small or the eye's focusing power is too weak, causing the visual image to focus behind the retina instead of directly onto it.