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Blurred Vision Due To Blood Glucose Level
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<blockquote data-quote="Dark Horse" data-source="post: 2457631" data-attributes="member: 52527"><p>Thanks for the link. As I read it, they are talking about the brain adapting to having both focussed and unfocussed areas on the retina due to the use of multi-focal lenses. I think the adaptation they are talking about is the brain learning to pay attention to the area that is in focus and to ignore the area that is out of focus rather than starting to see out of focus images as being in focus. If an image is unfocussed on the retina, there is a loss of information which the brain can't properly compensate for although it's plausible that someone could get better at interpreting blurred images.</p><p></p><p>You're right that the cornea is responsible for the majority of refraction of the incoming light (about 2/3rds) and the lens is used to provide accommodation so we can see at both near and far distances. In the old days, cataract surgery involved removal of the lens with no artificial lens to replace it and people who had this became very far-sighted. </p><p></p><p>Another link you might find interesting is <a href="https://webeye.ophth.uiowa.edu/eyeforum/cases/295-refractive-changes-in-diabetes.htm" target="_blank">https://webeye.ophth.uiowa.edu/eyeforum/cases/295-refractive-changes-in-diabetes.htm</a> It says:-</p><ul> <li data-xf-list-type="ul"><em>Sudden refractive changes in a diabetic patient are related to changes in osmotic pressure in the lens </em></li> <li data-xf-list-type="ul"><em>Osmotic changes → swelling or dehydration of the lens → change in the thickness, curvature, and/or refractive index</em></li> <li data-xf-list-type="ul"><em>Myopic shifts are more commonly reported, but hyperopic shifts have been reported and are thought to be due to changes in refractive index of the lens</em></li> </ul><p>The general view is that changes in focussing ability with hypeglycaemia are due to effects on the lens rather than the cornea.</p></blockquote><p></p>
[QUOTE="Dark Horse, post: 2457631, member: 52527"] Thanks for the link. As I read it, they are talking about the brain adapting to having both focussed and unfocussed areas on the retina due to the use of multi-focal lenses. I think the adaptation they are talking about is the brain learning to pay attention to the area that is in focus and to ignore the area that is out of focus rather than starting to see out of focus images as being in focus. If an image is unfocussed on the retina, there is a loss of information which the brain can't properly compensate for although it's plausible that someone could get better at interpreting blurred images. You're right that the cornea is responsible for the majority of refraction of the incoming light (about 2/3rds) and the lens is used to provide accommodation so we can see at both near and far distances. In the old days, cataract surgery involved removal of the lens with no artificial lens to replace it and people who had this became very far-sighted. Another link you might find interesting is [URL]https://webeye.ophth.uiowa.edu/eyeforum/cases/295-refractive-changes-in-diabetes.htm[/URL] It says:- [LIST] [*][I]Sudden refractive changes in a diabetic patient are related to changes in osmotic pressure in the lens [/I] [*][I]Osmotic changes → swelling or dehydration of the lens → change in the thickness, curvature, and/or refractive index[/I] [*][I]Myopic shifts are more commonly reported, but hyperopic shifts have been reported and are thought to be due to changes in refractive index of the lens[/I] [/LIST] The general view is that changes in focussing ability with hypeglycaemia are due to effects on the lens rather than the cornea. [/QUOTE]
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