I think I answered this question yesterday. SEE VIDEO BELOW FOR SIMILAR PATIENTS:
As I recall, you started with some asymmetry. The real problem here is not recognizing this prior to surgery. In general, I make patients aware of their breast asymmetry (everyone has it) and some chose to fix it (not always possible) while others elect to do nothing. For the most part, in clothing, your asymmetry will go undetected and that is quite reasonable for many patients. That does not seem to be the situation in your particular instance.
In your case, the mounds are shaped differently and are typical of patients who present with a greater soft tissue envelope and mild sagging (on the right breast) compared to a smaller more elevated breast on the left. Placing similar sized implants will inflate the relatively smaller breast and elevate the nipple on the left more than the right giving it a "tighter" appearance with higher nipple-areola complex.
Which breast do you like better? Some of my patients prefer the right (more natural) whereas younger patients tend to prefer the left ( "high and tight"). Depending on your preference different options are available but there is no obvious deformity. It essentially comes down to taste and preference and you need to make your preferences known to your surgeon.
FOR EXAMPLE, if you like the right, you may want to consider downsizing the left implant and contemplating a right perareolar crescent mastopexy. If you prefer the left you may want to make the right larger with a periareolar crescent mastopexy. In any case you will incur more scars.