All the high index lens materials suffer from chromatic aberration. The lens material you've now chosen actually has the best optical properties out of all the

All the high index lens materials suffer from chromatic aberration. The lens material you've now chosen actually has the best optical properties out of all the plastic lens materials. Its only downside is that the refractive index is only 1.5 which does mean they will be a little bit thicker than the high index ones. You could also try a material called Trivex which also has low chromatic aberration while being a little thinner than the material you are using which is called CR-39