YOU SAID:

To have eyes in the back of one's head

INTO JAPANESE

頭の後ろに目がある

BACK INTO ENGLISH

eyes on the back of the head

INTO JAPANESE

頭の後ろに目

BACK INTO ENGLISH

eyes behind head

INTO JAPANESE

頭の後ろの目

BACK INTO ENGLISH

eyes on the back of the head

INTO JAPANESE

頭の後ろに目

BACK INTO ENGLISH

eyes behind head

INTO JAPANESE

頭の後ろの目