Do I need to consider the size of contacts when buying them?
I am a new user for contacts and I was recommended from my friend to use colored contacts recently. My eyes look bigger compared with off glasses. I really like my new look. But why do my eyes get dry and itch after wearing contacts for a while, is it because of lack of oxygen? And one day, one contact even jump out of my eyes, I was terrified, then I am guessing that the size of the contacts are too small for my eyes. Is that right? Do I need to have my eyes checked before to ensure get the correct size contacts?