I certainly hope that you have had some sort of exam that deals specifically with the lump in your breast. You didn't mention having a mammogram or ultrasound but you do refer to having been to a doctor. Anything new or different in the breast sould be checked out as soon as possible. I don't think your vision problems would be related to the breast issues. I would advise that you see a Breast Specialist about both your breast concerns. Rgards ....
After reading Carmen42 comments above, I thought this bit of info would be of interest. As you have said her eye problems wouldn't be associated with the breast discharge.
However after reading this I thought perhaps the two are connected. Lots of things going wrong with your brain can effect your eyes.
Several disorders can cause an abnormal discharge. Abnormal discharges vary in appearance depending on the cause. A bloody discharge may be caused by a noncancerous breast tumor (such as a tumor in a milk duct, called an intraductal papilloma) or, less commonly, by breast cancer. Among women who have an abnormal discharge, breast cancer is the cause in fewer than 10%. A greenish discharge is usually due to a fibroadenoma, a noncancerous solid lump. A discharge that contains pus and smells foul may result from a breast infection. A large amount of milky discharge in women who are not breastfeeding may result from galactorrhea (see Pituitary Gland Disorders: Galactorrhea). Tumors of the pituitary gland or brain, encephalitis (a brain infection), and head injuries can also cause a nipple discharge. Taking certain drugs, such as antidepressants and certain antihypertensives, can cause a nipple discharge. Taking oral contraceptives may cause a watery discharge.