Minh duoc Bac Hung Tan Phu tu van ve viec tai sao cac van dong vien dang cap the gioi ,xu dung mat den ben FH ,ly do de co duoc mau den cua mat vot ,phai co than hoat tinh ,con mau do thi khong,nen mat den co do bam+do ben rat cao ,ma ben FH cuong do hoat dong nhieu hon ben BH .