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.
Emphysema caused by smoking most often occurs in the upper lobes of the lungs. In chronic bronchitis, smoking triggers inflammation that causes damage in the airways. The processes involved include: 1  Damage to the cilia, the hair-like waving projections that move mucus, bacteria, and foreign particles out of the lungs. 2  Enlargement of the mucus glands in the large airways of the lungs. 3  Overgrowth of smooth muscle cells in the airway.