A cautionary tale for anyone who simultaneously uses intracoular lenses and a roller coaster:
“Repositioning of a Dislocated Intraocular Lens During a Roller-Coaster Ride,” M.M. Bosch, K. Landau, and M.A. Thiel, New England Journal of Medicine, vol. 349, no. 11, September 11, 2003, pp. 1094–6. [AIR 15:5] The authors, at the University of Zurich, report:
“Implantation of an intraocular lens is the standard technique for visual rehabilitation in cataract surgery. We report the case of a patient with
spontaneous relocation of a dislocated intraocular lens during a roller-coaster ride…. On the weekend before the scheduled surgery, the patient took three consecutive rides on one of the largest roller coasters in Europe (Fig. 1C). After reaching a height of 73 m and being brought to a speed of 130 km per hour, passengers are exposed to a centripetal force of 4 G. Hours later, the patient discovered that his right pupil had become round. Slit-lamp examination confirmed the complete repositioning of the intraocular lens into the posterior chamber (Fig. 1D).”
CORRECTION: As several commenters have pointed out, an intraocular lens — which goes inside the eye — is not the same thing as a contact lens — which sits on the eye. The wording above has been changed to reflect that.