Large Power Differential in two eyes

hi there,

I've been using lens glasses for three years and have been almost
consistently uncomfortable with them. I went for eye check for 4
times or so, and each time the prescription doesn't change much.

I guess the problem might be in the power differential of my two
eyes(-2D, and -4.5D), I did some research and learned this might be
the cause. I tried contacts which is supposed to be better in this
sense, I do feel better but the vision is not as good as glasses,
whenever I look on an object, the focusing with contacts take some
time. The reason might be that contacts didn't correct my
stigmatism( 0.25 maybe). Also, I'm not very comfortable to take it in
and out of my eye daily, and my eye may be a bit dry, It's
uncomfortable after one day or two.

I'm thinking about can I use a lens glasses with -2D for both eyes ?
I know it will make my bad eyes lazy, but I really wanna get to a
better status than I currentlly am. To make up, can I use a contact of
-2.5D for my bad eye( so, it gonna be -2+ -2.5 = -4.5 for the bad
eye) ? Or I can occasionlly use a lens glasses(-2D, -4.5D) to get my
bad eye some exercises.

Opinions appreciated!.

Chao.