In some cases, the vitreous gel can peel the retina away from the back of the eye, resulting in a macular hole or retinal tear. This can progress into a retinal detachment if left untreated. Injury or trauma Very occasionally, an injury to the eye or trauma can result in a retinal detachment.
Breathing at higher altitudes might be especially difficult if you have COPD as well as another condition, such as high blood pressure, heart disease, or diabetes. Being exposed to high-altitude conditions for more than several days can also affect the heart and kidneys.
Review the four forces that affect flight and discuss how they cause an airplane to fall, rise, slow down, or speed up. Discuss how drag can slow an airplane down. Ask students if the drag on an object will increase if the surface area is increased or the object speeds up.