Wearing Sunglasses 3 Months Post Op?

You should not damage anything to your nose by wearing sunglasses (or regular glasses) 3 months after rhinoplasty.  The swelling after rhinoplasty can take 6-12 months to resolve, so this is most likely the reason for the impressions you saw after wearing your sunglasses.  This will not lead to any permanent change in the appearance of your nose.  

At 3 months post surgery, your nasal bones should be strong enough for glasses.  It can take up to a full year for all of the swelling to completely subside.  The impression was most likely due to some residual swelling, but you did not do anything to cause long term damage.

I generally advise my patients to refrain from wearing sunglasses for at least 6 weeks after surgery. You should be ok at 3 months post-op. I would recommend speaking with your surgeon, as they may have specific guidelines they would like you to follow. I hope this helps, and I wish you the best of luck.