fatdad wrote:The effects on vision of people who have had radial keratotomy. I heard of instance of people on Everest having vision problems. Supposedly the lack of air pressure at higher altitudes permits the eyes to bulge out more, but I don't know if this theory has ever been tested or at what altitude the effects become noticeable.
The very well known case of this was Beck Wethers on Everest in 1996. His vision difficulties were only the beginning of much bigger problems that followed.