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).
Someone with short-sightedness can see near objects clearly, but cannot focus properly on distant objects. This is caused by the eyeball being elongated, so that the distance between the lens and the retina is too great.