A camera capable of operating in a red-eye prevention mode. The camera has an electronic flash device which is activated by a drive circuit in synchronization with the exposure. The electronic flash device also serve as a pre-light-emission device capable of performing pre-light-emission for the purpose...http://www.google.com.hk/patents/US5526090?utm_source=gb-gplus-share專利 US5526090 - Control device for preventing red-eye effect on camera
