In photography it is known that when you reduce the aperture, you increase the depth of field. What this means is that more of the image is in focus. The reason however is not as you suggest above but has to do with the out of focus light that is falling on the light sensor covering a smaller area. You may want to look into this.

I’m not convinced by conventional wisdom, which according to Wikipedia is that the only proven explanation for myopia progressing over time, is that the eyeball (including its length) continues to grow with age. Apparently there is some conflicting evidence that constant reading might be a factor, but no proof of any benefit from either wearing progressive vision lenses or going without single vision lenses, part or all of the time. Yet have studies fully eliminated all possible combinations of contributing factors? What if you combine single vision lenses with constant near work, insufficient breaks, poor lighting, and/or overcorrection, etc.? I’m not ready to buy that near-sightedness worsens only by growing up and nothing else! Not when other internet articles indicate that doctors have been wondering for years if giving the myopic eye distance lenses for reading is such a good idea.

In any event, perhaps in your particular case it might be worth trying “mono-vision”—correcting your strong eye to distance vision, and the weak eye to near vision. (The brain adapts to seamlessly switching between eyes, while still using the periphery of the other eye for depth perception. Although it’s easier if it’s your right eye that is used for distance, and there isn’t too huge a difference between eyes; sometimes it can still work.) That way each eye only has to accommodate half the range—your “near vision” eye only has to cover from near to mid-vision, and your “distance” eye only has to cover from far to mid distance.

Maybe that would lessen any potential increased worsening, although reportedly there would still be some as long as your eyes continue to grow. (And with the natural onset of presbyopia as you get older, you may eventually need to switch to progressive vision. I don’t know whether that can be combined with mono-vision, but it couldn’t hurt to ask.)

Since apparently there is at least one study that indicates undercorrecting myopia causes it to worsen even faster (the theory being that any blurred vision causes the eye to elongate), mono-vision (or at least progressive vision) might be a better alternative. Or leave them off to read, but at least wear them for distance vision (such as driving!).