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.
Most experts say it is unlikely that flying will cause pre-term delivery. I don't think that there is any evidence to suggest that flying can cause women to go into labor, says Dr. John Repke, chairman of the department of obstetrics and gynecology at the University of Nebraska Medical Center in Omaha.