I have severe nearsightedness (-7 diopter) and I wanted to know what the cause is primarily?

I have severe nearsightedness (-7 diopter) and I wanted to know what the cause is primarily?
Is it because of the lense inside my eye is defective??
or the muscles that adjust the lense have something wrong with them?
or my cornea is shaped different (too steep or whatever)?
or is it because my eyeball is too long so the image is unable to focus on the retina?
or could it be either of these or a combination...
I do know that the cornea and the lense work together to focus the image on the retina and the muscles work to fatten or elongate the lense in order to focus the image.
I have been researching this a lot but haven't been able to find the answer so if anyone knows I will greatly appreciate an answer!!
Also, if you have an tips on how to prevent my vision from getting worse, let me know.

You simply have a LOOONG eyeball. As you suspected, the image is unable to focus on the retina due to the length of the eyeball/globe.

There has been some research that shows that wearing rigid gas permeable (RGP) lenses may slow progression of nearsightedness.

There is also a procedure called Ortho-K where you wear RGP lenses at night to "reshape" your cornea. PrinceIDoc here on Answers does Ortho-K. I'll start this one, and maybe he will tell you more....

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