An observational study determined that there is a strong correlation between sitting close to the television and poor eyesight. Can sitting too close to the television causes poor eyesight? Explain. Causation cannot be proven because everyone watches television. Causation can be proven because it is well known that sitting close to the television causes poor eyesight. Causation can be proven because there was a strong correlation. Causation cannot be proven because poor eyesight can occur for other reasons, such as genetics