Difference between revisions of Lens-induced myopia
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tweak and add some references
(I'm still fighting this mantra that hyperopic defocus is categorically *the* mechanism at play here :-)) |
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'''Lens-induced myopia''' is the generally accepted observation (by researchers, if not the mainstream optometry industry - citation needed) that wearing corrective lenses seems to somehow cause myopia to worsen. Typically when someone wears [[distance vision]] glasses for [[close-up]] use. | '''Lens-induced myopia''' is the generally accepted observation (by researchers, if not the mainstream optometry industry - citation needed) that wearing corrective lenses seems to somehow cause myopia to worsen. Typically when someone wears [[distance vision]] glasses for [[close-up]] use. | ||
The actual mechanism is still an area of active research | The actual mechanism is still an area of active research, but the underlying cause appears to be [[axial elongation]]<ref>{{cite journal| author=McBrien NA, Adams DW| title=A longitudinal investigation of adult-onset and adult-progression of myopia in an occupational group. Refractive and biometric findings. | journal=Invest Ophthalmol Vis Sci | year= 1997 | volume= 38 | issue= 2 | pages= 321-33 | pmid=9040464 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=9040464 }}</ref>. | ||
One of several hypotheses is that it is result of [[hyperopic defocus]].<ref name="Proteomic analysis of chick retina during early recovery from lens‑induced myopia">{{Cite journal |last=Zhou |first=Yun Yun |last2=Chun |first2=Rachel Ka Man |last3=Wang |first3=Jian Chao |last4=Zuo |first4=Bing |last5=Li |first5=King Kit |last6=Lam |first6=Thomas Chuen |last7=Liu |first7=Quan |last8=To |first8=Chi-Ho |date=2018-05-03 |title=Proteomic analysis of chick retina during early recovery from lens‑induced myopia |url=http://www.spandidos-publications.com/10.3892/mmr.2018.8954/abstract |journal=Molecular Medicine Reports |volume=18 |issue=1 |pages=59–66 |doi=10.3892/mmr.2018.8954 |issn=1791-2997}}</ref> | |||
It has been shown in studies that myopic defocus is protective against myopia progression.<ref name="Long -term effects of optical defocus on eye growth and refractogenesis">{{Cite journal |last=Tarutta |first=Elena |date=2016 |title=Long -term effects of optical defocus on eye growth and refractogenesis |url=https://www.pum.edu.pl/__data/assets/pdf_file/0007/112849/PomeranianJLifeSci_62-01_025-030.pdf |journal=Pomeranian J Life Sci |volume=62(1) |pages=25–30}}</ref> | It has been shown in studies that myopic defocus is protective against myopia progression.<ref name="Long -term effects of optical defocus on eye growth and refractogenesis">{{Cite journal |last=Tarutta |first=Elena |date=2016 |title=Long -term effects of optical defocus on eye growth and refractogenesis |url=https://www.pum.edu.pl/__data/assets/pdf_file/0007/112849/PomeranianJLifeSci_62-01_025-030.pdf |journal=Pomeranian J Life Sci |volume=62(1) |pages=25–30}}</ref> | ||
A core tenant of EM is that doing [[near work]] in lenses designed for [[distance work]] causes myopia progression. Even if hyperopic blur is not induced by the lenses, the [[accommodation]] system is being constantly stressed and this encourages [[ | A core tenant of EM is that doing [[near work]] in lenses designed for [[distance work]] causes myopia progression. Even if hyperopic blur is not induced by the lenses, the [[accommodation]] system is being constantly stressed and this encourages eye [[axial elongation]].<ref>{{cite journal| author=Read SA, Collins MJ, Woodman EC, Cheong SH| title=Axial length changes during accommodation in myopes and emmetropes. | journal=Optom Vis Sci | year= 2010 | volume= 87 | issue= 9 | pages= 656-62 | pmid=20562668 | doi=10.1097/OPX.0b013e3181e87dd3 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=20562668 }}</ref><ref>{{cite journal| author=Mallen EA, Kashyap P, Hampson KM| title=Transient Axial Length Change during the Accommodation Response in Young Adults. | journal=Invest Ophthalmol Vis Sci | year= 2006 | volume= 47 | issue= 3 | pages= 1251-4 | pmid=16505066 | doi=10.1167/iovs.05-1086 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16505066 }}</ref>This is supported by the fact that both [[bifocals]] and [[multifocals]], which allow the eye to use less accommodation to do near work, are protective against myopia progression <ref name="Can Bifocals Slow Myopia Progression?">{{Cite journal |last=Gw |first=Fulk |last2=La |first2=Cyert |date=Dec 1996 |title=Can Bifocals Slow Myopia Progression? |url=https://pubmed.ncbi.nlm.nih.gov/9286316/ |journal=Journal of the American Optometric Association |language=en |volume=67(12) |pages=749–754 |pmid=9286316 |via=PubMed}}</ref><ref name="Myopia Progression With Biofocal Soft Contact Lenses - A Twin Study">{{Cite journal |last=Aller |first=Thomas |date=2002-12-13 |title=MYOPIA PROGRESSION WITH BIFOCAL SOFT CONTACT LENSES - A TWIN STUDY.: Poster # 142 |url=https://journals.lww.com/optvissci/Citation/2002/12001/MYOPIA_PROGRESSION_WITH_BIFOCAL_SOFT_CONTACT.346.aspx |journal=Optometry and Vision Science |language=en-US |volume=79 |issue=12 |pages=179 |issn=1538-9235}}</ref><ref name="Myopia Control With Bifocal Contact Lenses: A Randomized Clinical Trial">{{Cite journal |last=Aller |first=Thomas |last2=M |first2=Liu |last3=Cf |first3=Wildsoet |date=Apr 2016 |title=Myopia Control With Bifocal Contact Lenses: A Randomized Clinical Trial |url=https://pubmed.ncbi.nlm.nih.gov/26784710/ |journal=Optometry and Vision Science Supplement |language=en |volume=93(4) |pages=344–52 |pmid=26784710}}</ref><ref name="Effect of Bifocal Lenses on the Rate of Childhood Myopia Progression">{{Cite journal |last=Goss |first=D A |date=Feb 1986 |title=Effect of Bifocal Lenses on the Rate of Childhood Myopia Progression |url=https://pubmed.ncbi.nlm.nih.gov/3953756/ |journal=American journal of optometry and physiological optics |language=en |volume=63(2) |pages=135–41 |pmid=3953756}}</ref> | ||
==Near Work Induced Myopia== | ==Near Work Induced Myopia== | ||