Difference between revisions of Axial length
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==Biology== | ==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. <ref>{{cite journal| author=Wallman J, Winawer J| title=Homeostasis of eye growth and the question of myopia. | journal=Neuron | year= 2004 | volume= 43 | issue= 4 | pages= 447-68 | pmid=15312645 | doi=10.1016/j.neuron.2004.08.008 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15312645}}</ref> | 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. <ref>{{cite journal| author=Wallman J, Winawer J| title=Homeostasis of eye growth and the question of myopia. | journal=Neuron | year= 2004 | volume= 43 | issue= 4 | pages= 447-68 | pmid=15312645 | doi=10.1016/j.neuron.2004.08.008 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15312645}}</ref> | ||
==How it can be reduced== | ==How it can be reduced== | ||
Revision as of 14:14, 15 June 2020
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. Finally, good distance vision practices.
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.