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Myopic defocus is the technical term used by research papers to describe the blur caused by having the light focused in front of the retina. This is the typical symptom of uncorrected Myopia (short-sightedness). Myopic blur can be induced by reduced lenses for myopes or plus lenses and looking in the distance.
Studies have shown it to induce axial shortening. It is the underlying mechanism for EndMyopia myopia reduction.
Appropriate amounts of myopic defocus induce axial shortening. Excessive myopic defocus or form deprivation (such as blur from diffusers) tend to induce axial elongation, just like hyperopic defocus, or may result in no changes, which is called blur adaptation.