Breast Lift on One Breast then Silicone Implant for the Other?

Dear Hellokitty!
Correction of breast asymmetry with different prcedures on each breast does introduce variables that are more difficult to control. This however is a good approach and you should be very satisfied with the results. The key is that you may need an adjustment with another surgery at some point in the future to achieve the best results.
With Warm Regards,
Trevor M Born MD

You have a difficult problem and there are many ways to address it. Sometimes it does require placing an implant on one side and not the other. This is not ideal but at times it is the best and only way to go about getting the breast looking similar. The key word I use here is similar. They will by no means be identical, but rather close.
Other methods include reducing the larger side and placing the same size implant on both sides. But this depends on how big the difference is between the two breasts.
For breast asymmetry I commonly recommend seeing a couple of board certified plastic surgeons to go over your options.

Please keep in mind that what you do today to make yourself less uneven will not last long. Depending on the degree of asymmetry present and the amount of breast tissue on the larger side as well as interval changes such as weight gain/loss, pregnancy, menopause, etc, your breasts WILL CHANGE with time. Even if you achieve perfect symmetry (impossible) in the short term, it is not permanent. Changes will occur over time. It is very important to have realistic expectations.
I have a four part video on Breast Asymmetry on Youtube and I am attaching a link to these if you are interested. These review some of the many options available to manage breast asymmetry

Breast asymmetry is very common. I often tell my patients that breasts can be more like "cousins" than "sisters". It sounds as if you have signifcant differences between your two breasts in terms of size and shape. This is a challenging problem that can be corrected and often requires two different operations on each breast. You can have a breast reduction on your larger breast so that it is smaller and matches your other breast. If you want the size of your breasts to be the same as the larger one than you must place an implant in your smaller breast. When you do this, the size will be the same, but your larger breast will be slightly more "droopy" - this means that you will need a breast lift on the larger breast. It sounds like the plan your surgeon has made with you is a reasonable one - assumming that you want your breasts to be the size of the larger one, and not the size of the smaller one.

If your breasts are significantly different before surgery, they will remain somewhat different after surgery. This is normal. Do not expect perfect symmetry. The decision to have implants on one side or both is simple. Do you want your larger side to be even larger? If you do, then you should have implants on both sides with the smaller side having a bigger implant obviously. If you don't want your larger side to be even larger, then do not put an implant on this side.
Either way, the only way to make the smaller side larger is to put an implant on that side. Once you have decided about the implants, then your surgeon should evaluate the shape difference in your breasts. Here is where the various lift procedures may be used. Good luck.