Can laser eye surgery regress?
The patients I have seen with RK (the procedure you had on your left eye) have not regressed, they have advanced. They had a minus prescription before their surgery, now they have a plus one. Laser surgery does sometimes regress a little. It is perfectly normal for people at age 40 to require glasses to read. Having refractive surgery does not change this. If your eye with RK is better than your laser eye, you are very unusual.