My daughter has thinned retinas and is extremely nearsighted. She got her glasses prescribed at 3 months. I actually called the opthamology (I can never spell that correctly...) department at 2.5 months for the exact reasons you mentioned. The only difference is that my daughter did seem to react to light. I would call and let them know your concerns. If they don't think you should be seen, they will tell you. I am so thankful that I called when I did because DD had basically gone 3 months without really seeing me.
However, I can tell you the exact date, time, etc. that my daughter saw me for the first time. What an amazing gift!
Good luck and I am happy to answer any more questions that you have!