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.
Pilots who never venture into the flight levels tend to regard high-altitude flying in relatively simple terms. We all know what hypoxia is, though many of us have never experienced the symptoms ourselves in any meaningful way. Weâre aware of the FAA regulations requiring supplemental oxygen when flying above 12,500 feet for more than 30 minutes or any time above 14,000 feet â and so we make sure we stay below those altitudes.