The eyecup is certainly the most useful accessory for users who use the device tactically or for hunting. Already the simple eyecup successfully prevents the leakage of stray light when the TILO is worn as glasses. Thus, the user remains unseen even in pronounced darkness for wildlife and humans. The eyecup is simply slipped over the receiving ring. Another positive side effect of the attached eyecup is that it provides extra protection against scratching the eyepiece glass. Suitable for all TILO devices.