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Astigmatism is also a source of anisometropia. Glasses correction of anisometropia can lead to aniseikonia, or different retinal image sizes. Thalakan ( talk) 04:25, 14 December 2011 (UTC)
[Blank contribution by Special:Contributions/2601:2C3:4201:D70:CC1A:C3C1:6DB3:367B on 28 Feb 2020.]
The formula for iseikonic lenses would benefit from an example.
Though I'm not an expert, I started drafting an example based partly upon general knowledge, and partly upon on default values for an online calculator.
However, I ran into trouble trying to typeset the mathematical formula. I wanted to show the working (including the size of each term in the formula), but I cannot seem to get the syntax to work.
Hence I left the following 'hidden' in the article for someone else to pick up on.
<!--
Example:<br>
Consider a pair of spectacles to correct for myopia with a prescription of −1.00 m<sup>−1</sup> in one eye and −3.00 m<sup>−1</sup> in the other. Suppose that for both eyes the other parameters are identical, namely ''t'' = 1 mm = 0.001 m, ''n'' = 1.6, ''P'' = 5 m<sup>−1</sup>, and ''h'' = 15 mm = 0.015 m. <br>
Then for the first eye <math> \textrm{Magnification} = \frac{1}{(1-(0.001/1.6)×5)}\cdot \frac{1}{(1-0.015×−1)} </math>
-->
—DIV ( 1.129.106.159 ( talk) 06:50, 27 February 2021 (UTC))
This online calculator indicates that the distance used in the formula should be defined as that from the pupil to the back of the spectacle lens, rather than the cornea. It seems reasonable to me. If so, then the definition of h in the current WP article is not quite right.
It would also imply that with contact lenses the severity of aniseikonia would be much reduced, but not strictly zero.
—DIV ( 1.129.106.159 ( talk) 11:56, 27 February 2021 (UTC))
This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||
|
Ideal sources for Wikipedia's health content are defined in the guideline
Wikipedia:Identifying reliable sources (medicine) and are typically
review articles. Here are links to possibly useful sources of information about Anisometropia.
|
Astigmatism is also a source of anisometropia. Glasses correction of anisometropia can lead to aniseikonia, or different retinal image sizes. Thalakan ( talk) 04:25, 14 December 2011 (UTC)
[Blank contribution by Special:Contributions/2601:2C3:4201:D70:CC1A:C3C1:6DB3:367B on 28 Feb 2020.]
The formula for iseikonic lenses would benefit from an example.
Though I'm not an expert, I started drafting an example based partly upon general knowledge, and partly upon on default values for an online calculator.
However, I ran into trouble trying to typeset the mathematical formula. I wanted to show the working (including the size of each term in the formula), but I cannot seem to get the syntax to work.
Hence I left the following 'hidden' in the article for someone else to pick up on.
<!--
Example:<br>
Consider a pair of spectacles to correct for myopia with a prescription of −1.00 m<sup>−1</sup> in one eye and −3.00 m<sup>−1</sup> in the other. Suppose that for both eyes the other parameters are identical, namely ''t'' = 1 mm = 0.001 m, ''n'' = 1.6, ''P'' = 5 m<sup>−1</sup>, and ''h'' = 15 mm = 0.015 m. <br>
Then for the first eye <math> \textrm{Magnification} = \frac{1}{(1-(0.001/1.6)×5)}\cdot \frac{1}{(1-0.015×−1)} </math>
-->
—DIV ( 1.129.106.159 ( talk) 06:50, 27 February 2021 (UTC))
This online calculator indicates that the distance used in the formula should be defined as that from the pupil to the back of the spectacle lens, rather than the cornea. It seems reasonable to me. If so, then the definition of h in the current WP article is not quite right.
It would also imply that with contact lenses the severity of aniseikonia would be much reduced, but not strictly zero.
—DIV ( 1.129.106.159 ( talk) 11:56, 27 February 2021 (UTC))