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The Israeli authorities at Erez checkpoint this week prevented the exit of 17 sight-impaired patients, suffering from various eye diseases, from the Gaza Strip in order to undergo cornea transplants, a treatment that is not available in the Gaza health system. Because of this delay, the medical window of opportunity to perform the transplants for these patients was closed, because corneas can be transplanted only within the shortest time frame (24-48 hours after they are extracted from the donor's body). The patients from Gaza whose exit was prevented will therefore have to wait for another donation, which may or may not happen.