Difference between revisions of Blur
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==Myopic vs Hyperopic Blur== | ==Myopic vs Hyperopic Blur== | ||
Myopic blur is the type of blur normally experienced by people with uncompensated [[myopia]]. Hyperopic blur is the type normally experienced by people with uncompensated hyperopia. In order to induce blur, use a lens with the opposite [[diopter]] sign as the lens normally used for blur correction, so a plus lens will give myopic blur to an [[emmetrope]]. A weak negative lens will give myopic blur to a myope. | Myopic blur is the type of blur normally experienced by people with uncompensated [[myopia]]. Hyperopic blur is the type normally experienced by people with uncompensated hyperopia. In order to induce blur, use a lens with the opposite [[diopter]] sign as the lens normally used for blur correction, so a plus lens will give myopic blur to an [[emmetrope]]. A weak negative lens will give myopic blur to a myope. | ||
==Diffusion blur== | ==Diffusion blur== | ||
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==Defocus as a stimulus for eye length changes== | ==Defocus as a stimulus for eye length changes== | ||
The eye needs stimulus to make corrective changes. Studies have shown that inducing defocus can induce axial lengthening and shortening. | The eye needs stimulus to make corrective changes. Studies have shown that inducing defocus can induce axial lengthening and shortening. | ||
<ref name="pmid29749514">{{cite journal| author=Zhou YY, Chun RKM, Wang JC, Zuo B, Li KK, Lam TC | display-authors=etal| title=Proteomic analysis of chick retina during early recovery from lens‑induced myopia. | journal=Mol Med Rep | year= 2018 | volume= 18 | issue= 1 | pages= 59-66 | pmid=29749514 | doi=10.3892/mmr.2018.8954 | pmc=6059693 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29749514 }} </ref> | |||
<ref>{{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}}</ref><ref>{{Cite journal |last=Zhu |first=Xiaoying |last2=McBrien |first2=Neville A. |last3=Smith |first3=Earl L. |last4=Troilo |first4=David |last5=Wallman |first5=Josh |date=2013-04-01 |title=Eyes in Various Species Can Shorten to Compensate for Myopic Defocus |url=https://iovs.arvojournals.org/article.aspx?articleid=2189093 |journal=Investigative Ophthalmology & Visual Science |language=en |volume=54 |issue=4 |pages=2634–2644 |doi=10.1167/iovs.12-10514 |issn=1552-5783}}</ref> | <ref>{{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}}</ref><ref>{{Cite journal |last=Zhu |first=Xiaoying |last2=McBrien |first2=Neville A. |last3=Smith |first3=Earl L. |last4=Troilo |first4=David |last5=Wallman |first5=Josh |date=2013-04-01 |title=Eyes in Various Species Can Shorten to Compensate for Myopic Defocus |url=https://iovs.arvojournals.org/article.aspx?articleid=2189093 |journal=Investigative Ophthalmology & Visual Science |language=en |volume=54 |issue=4 |pages=2634–2644 |doi=10.1167/iovs.12-10514 |issn=1552-5783}}</ref> | ||