MFC use in eye. Between the two?

My mother is 57 years old and have high BP problem..she was suffering from eye problem in left eye .I went to eye specialist he diagnosed it as"BRVO" and suggested for AVASTIN injection in  left eye. He also said to use MFC eye drop in left eye at interval of 4 -4 hours atleast  before 24 hr injection is taken ,I did that accordingly .but now due to some personal reasons I could not go to that hospital, I went to other eye specialist after proper check up and OTC checkup he also diagnosed with same problem. He also said that injection" Anti veg f" needs to be given in left eye and he didn't said himself to use MFC before injection is given . I m confused now what should I do (1) Can I use MFC eye drop in left eye before injection atleast before 24 hrs at interval of 4-4 hrs? (2) AVASTIN injection and ANTIVEG F injection are same or there is difference between the two? Pls help.