As such some of what we see is just the brains interpretation of sensations from the eye structure and the pressure applied to it. Try rubbing your closed eyes and you will see what I mean. Always remember that the number one job of the brain is pattern recognition.
Emphysema is a form of chronic (long-term) lung disease, usually caused by smoking. Because of lung damage, people with emphysema have difficulty blowing air out. The major symptom of emphysema is shortness of breath.
The most common cause of emphysema is smoking. Pulmonary fibrosis involves scarring, or fibrosis, in the lungs. This process causes air sacs and the supporting lung tissue to become stiff and thick. Fibrosis worsens over time and the lungs are not able to move oxygen into the blood stream.