Difference between revisions of Axial length
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==How it can be reduced== | ==How it can be reduced== | ||
[[Myopic defocus]], as well as conscious accommodation of the ciliary muscle during [[active focus]]. | [[Myopic defocus]], as well as conscious accommodation of the ciliary muscle during [[active focus]], can cause axial shortening. Having good [[close-up]] and [[distance vision]] practices helps. | ||
==How it can be increased== | |||
:''Main article: [[Axial elongation]]'' | |||
[[Hyperopic defocus]], excessive [[myopic defocus]], and form deprivation can cause [[axial elongation]]. | |||
==References== | ==References== | ||
Revision as of 19:04, 19 September 2021
Axial length of the eyeball is the distance from the lens to the retina. Elongation is the scientifically accurate reason why anyone has myopia.
Biology
It would require precision engineering to be able to grow an eye that was perfectly emmetropic at birth. Instead, it is of approximate dimensions, and feedback during postnatal development tunes the axial length to match the focusing system. Two mechanisms are available: changing the thickness of the choroid, and changing the length of the eyeball itself. [1]
How it can be reduced
Myopic defocus, as well as conscious accommodation of the ciliary muscle during active focus, can cause axial shortening. Having good close-up and distance vision practices helps.
How it can be increased
- Main article: Axial elongation
Hyperopic defocus, excessive myopic defocus, and form deprivation can cause axial elongation.
References
- ↑ Wallman J, Winawer J (2004). "Homeostasis of eye growth and the question of myopia". Neuron. 43 (4): 447–68. doi:10.1016/j.neuron.2004.08.008. PMID 15312645.Page Module:Citation/CS1/styles.css has no content.