Is my cataract going to get worse?

I'm 29 years old. Recently, my vision in my right eye has been improving steadily. This prompted me to get a thorough eye check, where I was diagnosed with cataracts. The doctor explained that my right eye's vision is improving because the muscles are relaxing. However, I find this explanation difficult to believe since my prescription has remained constant for 14 years, and it has only recently dropped from -4.5 to -3 within a few months. Will my condition gets worse?