Can an optometrist force a brand of contacts on me?

I went to a new opto in November to get my annual exam and Acuvue 2 perscription. After waiting two months for the trial pair, becuase my pers. changed I was given Acuvue Oaysis, without and pre- knowledge. I had a bad reaction and had to remove them after 3 days. I told the doctor my eye was red and i took them out and she told me to come in. I was then charged for another eye exam. I asked for my Acuvue perp. and told by the receptionist it was being ordered. Today, a month later, she doctoe called to tell me my trial of Acuvue Advance was ready and to come in for a consult. I told her I would not try them and I wanted Acuvue 2's , which is what I have worn for 10 years. She said she will not order those and its take the new ones or thats it. My insurance was only good for 1 exam and that was for 2008 so I cant go anywhere else. If I go for the new trial and have another bad reaction i will charged again, which she said when asked, and then I am no better off just out more $. Is there any law or code in PA that states she has to order my contacts? Is she allowed to just say no even though she accepted my copay for the exam?