Axial length changes during accommodation in myopes and emmetropes.
Read SA, Collins MJ, Woodman EC, Cheong SH.
Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Queensland, Australia.
Optom Vis Sci. Sep;87(9):656-62.
2010
and also:
Axial elongation following prolonged near work in myopes and emmetropes.
Woodman EC, Read SA, Collins MJ, Hegarty KJ, Priddle SB, Smith JM, Perro JV.
Br J Ophthalmol. 2011 May;95(5):652-6.
These studies found that the eye elongates during periods of accommodation (when the eye changes to achieve clear focus), and it does so equally in people who are myopic as well as those who are not. The lens thickness also changes. In the second study, the myopic eyes elongated more than the non-myopic eyes, during a prolonged period (30 minutes) of near work.
From what I've learned so far, the myopic eye (with axial myopia) is elongated, and its crystalline lens does not function properly. In induced myopia, these structural changes are induced and can be reversed. But the studies of induced myopia are on animals. If lens thickening and axial elongation are part of the process of focusing, I wonder why the myopic eye continues to elongate and loses its capacity to change.
Link to abstracts:
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