How is the retina effected with reduced axial lenght

I am wondering how the retina is effected when the axial lenth is reduced. does the retina reduce in size as well or does it become loose? And what if you are really high myope like -15

I’m suppose that a retina is stretched in myopia eyes. And if axial length reduces, it should be less streched. But I don’t no if there scientific researches on this.