Once this type of retinal detachment develops and causes symptoms, it can progress to total blindness if it is not repaired promptly. In the United States, retinal detachment is a relatively uncommon condition, affecting only one of every 10,000 Americans each year.
Gas exchange in reptiles still occurs in alveoli however, reptiles do not possess a diaphragm. Thus, breathing occurs via a change in the volume of the body cavity which is controlled by contraction of intercostal muscles in all reptiles except turtles.
Gas Exchange in the lungs. Exterior view of Alveoli. This is where gas exchange takes place in the lungs. Alveoli are tiny balloon-like sacs, in the lungs, where gas exchange takes place and they serve as the barrier between the external environment (the air) and the internal environment (the blood).