Chromatic Aberration - Revision history

Snax: /* Lens Material */

2022-09-18T04:49:10Z

Lens Material

← Older revision		Revision as of 04:49, 18 September 2022
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	* [https://www.framesbuy.com/trends/lens-index/ FramesBuy]		* [https://www.framesbuy.com/trends/lens-index/ FramesBuy]

	Anecdotally from the forums, -3 is a balanced cutoff range for CR-39 where one can take advantage of higher abbe and competitive cost, without ~~experience~~ too much distortion at lens edges.		Anecdotally from the forums, -3 is a balanced cutoff range for CR-39 where one can take advantage of higher abbe and competitive cost, without experiencing too much distortion at lens edges. Outside of that range, consider higher index lenses to minimize distortion.

	==References==		==References==

Snax: /* Lens Material */

2022-09-18T04:47:01Z

Lens Material

← Older revision		Revision as of 04:47, 18 September 2022
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	[https://community.endmyopia.org/t/lens-materials-and-optical-quality-chart/4415 chart created by steadicat]		[https://community.endmyopia.org/t/lens-materials-and-optical-quality-chart/4415 chart created by steadicat]

			=== Tradeoff Between Chromatic Aberration vs Distortion ===

			When choosing lens index, remember to take into account overall distortion at the edges of the lens. Too much overall distortion may make it difficult to view the edges of the lenses.

			[https://endmyopia.org/need-high-index-lenses/ EndMyopia: Do You Need High Index Lenses?]

			The following vendor articles may be of interest:
			* [https://www.zennioptical.com/glasses-lenses Zenni]
			* [https://www.eyebuydirect.com/prescription-lens/lens-index EyeBuyDirect]
			* [https://www.selectspecs.com/guides/lenses/single-vision/ SelectSpecs]
			* [https://www.framesbuy.com/trends/lens-index/ FramesBuy]

			Anecdotally from the forums, -3 is a balanced cutoff range for CR-39 where one can take advantage of higher abbe and competitive cost, without experience too much distortion at lens edges.

	==References==		==References==

Snax at 07:08, 5 August 2022

2022-08-05T07:08:54Z

← Older revision		Revision as of 07:08, 5 August 2022
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			[[File:Lens materials and optical quality chart.png\|Lens materials and optical quality chart]]

			[https://community.endmyopia.org/t/lens-materials-and-optical-quality-chart/4415 chart created by steadicat]


	==References==		==References==

User at 00:23, 29 August 2021

2021-08-29T00:23:04Z

@@ Line 3: / Line 3: @@
 [[File:Chromatic aberration lens diagram.svg|Chromatic aberration lens diagram]]
-= Duochrome test =
+== Duochrome test ==
 {| class="wikitable"
 |-
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 <youtube>WP6eeoyB9go</youtube>
-= External Sources =
+== External Sources ==
 * [[Wikipedia:Chromatic aberration]]
 * [[Wikipedia:Duochrome test]]
 ==References==

Dlskidmore: /* Duochrome test */ I think there is signs confusion here. Need to re-work the wording that is not backwards when signs are considered.

2020-07-17T19:47:49Z

Duochrome test: I think there is signs confusion here. Need to re-work the wording that is not backwards when signs are considered.

← Older revision		Revision as of 19:47, 17 July 2020
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	\|}		\|}

	The chromatic aberration expected during a normal eye exam is about a half diopter difference between red and green. This can be a handy test to dial in a final prescription by looking at text on red and green backgrounds and seeing which is clearer. For a standard [[Prescription]], if the green side is clearer, a quarter diopter of sphere is added, if the red side is clearer, a quarter diopter is removed. If the optometrist is trying to introduce a small amount of [[Myopic defocus]] he/she wants the red side clear.		The chromatic aberration expected during a normal eye exam is about a half diopter difference between red and green. This can be a handy test to dial in a final prescription by looking at text on red and green backgrounds and seeing which is clearer.

	<youtube>WP6eeoyB9go</youtube>		<youtube>WP6eeoyB9go</youtube>

Viceroy Sam: Add video, tidy links.

2020-07-09T13:49:33Z

Add video, tidy links.

← Older revision		Revision as of 13:49, 9 July 2020
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	The chromatic aberration expected during a normal eye exam is about a half diopter difference between red and green. This can be a handy test to dial in a final prescription by looking at text on red and green backgrounds and seeing which is clearer. For a standard [[Prescription]], if the green side is clearer, a quarter diopter of sphere is added, if the red side is clearer, a quarter diopter is removed. If the optometrist is trying to introduce a small amount of [[Myopic defocus]] he/she wants the red side clear.		The chromatic aberration expected during a normal eye exam is about a half diopter difference between red and green. This can be a handy test to dial in a final prescription by looking at text on red and green backgrounds and seeing which is clearer. For a standard [[Prescription]], if the green side is clearer, a quarter diopter of sphere is added, if the red side is clearer, a quarter diopter is removed. If the optometrist is trying to introduce a small amount of [[Myopic defocus]] he/she wants the red side clear.

			<youtube>WP6eeoyB9go</youtube>

	= External Sources =		= External Sources =
	* ~~https~~:~~//en.wikipedia.org/wiki/Chromatic_aberration~~		* [[Wikipedia:Chromatic aberration]]
	* ~~https~~:~~//en.wikipedia.org/wiki/Duochrome_test~~		* [[Wikipedia:Duochrome test]]

	==References==		==References==

Divenal: more pictures...

2020-06-24T10:54:38Z

more pictures...

← Older revision		Revision as of 10:54, 24 June 2020
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	Chromatic aberration is probably most easily understood as a prism effect. When light shines through a prism, you see that different colors of light bend (undergo [[Refraction]]) differently and create a rainbow effect. When light shines through any lens, including glasses and the natural lens of your eye, the same occurs to a lesser degree. The effect of this is that the [[Focal Length]] of the lens is not exactly the same for all colors of light.		Chromatic aberration is probably most easily understood as a prism effect. When light shines through a prism, you see that different colors of light bend (undergo [[Refraction]]) differently and create a rainbow effect. When light shines through any lens, including glasses and the natural lens of your eye, the same occurs to a lesser degree. The effect of this is that the [[Focal Length]] of the lens is not exactly the same for all colors of light.

			[[File:Chromatic aberration lens diagram.svg\|Chromatic aberration lens diagram]]

	= Duochrome test =		= Duochrome test =

Divenal: add link to refraction page

2020-06-03T12:04:42Z

add link to refraction page

← Older revision		Revision as of 12:04, 3 June 2020
Line 1:		Line 1:
	Chromatic aberration is probably most easily understood as a prism effect. When light shines through a prism, you see that different colors of light bend differently and create a rainbow effect. When light shines through any lens, including glasses and the natural lens of your eye, the same occurs to a lesser degree. The effect of this is that the [[Focal Length]] of the lens is not exactly the same for all colors of light.		Chromatic aberration is probably most easily understood as a prism effect. When light shines through a prism, you see that different colors of light bend (undergo [[Refraction]]) differently and create a rainbow effect. When light shines through any lens, including glasses and the natural lens of your eye, the same occurs to a lesser degree. The effect of this is that the [[Focal Length]] of the lens is not exactly the same for all colors of light.

	= Duochrome test =		= Duochrome test =

Dlskidmore: nuking "prescription" where that is not what is meant

2020-05-28T19:29:48Z

nuking "prescription" where that is not what is meant

← Older revision		Revision as of 19:29, 28 May 2020
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	\|}		\|}

	The chromatic aberration expected during a normal eye exam is about a half diopter difference between red and green. This can be a handy test to dial in a final prescription by looking at text on red and green backgrounds and seeing which is clearer. For a [[~~Full~~ Prescription]], if the green side is clearer, a quarter diopter of sphere is added, if the red side is clearer, a quarter diopter is removed. If the optometrist is trying to introduce a small amount of [[Myopic defocus]] he/she wants the red side clear.		The chromatic aberration expected during a normal eye exam is about a half diopter difference between red and green. This can be a handy test to dial in a final prescription by looking at text on red and green backgrounds and seeing which is clearer. For a standard [[Prescription]], if the green side is clearer, a quarter diopter of sphere is added, if the red side is clearer, a quarter diopter is removed. If the optometrist is trying to introduce a small amount of [[Myopic defocus]] he/she wants the red side clear.

	= External Sources =		= External Sources =

NottNott: Text replacement - "Category:Articles" to "==References== {{reflist}} Category:Articles"

2020-05-25T00:11:10Z

Text replacement - "Category:Articles" to "==References== {{reflist}} Category:Articles"

← Older revision		Revision as of 00:11, 25 May 2020
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	* https://en.wikipedia.org/wiki/Chromatic_aberration		* https://en.wikipedia.org/wiki/Chromatic_aberration
	* https://en.wikipedia.org/wiki/Duochrome_test		* https://en.wikipedia.org/wiki/Duochrome_test

			==References==
			{{reflist}}

	[[Category:Articles]]		[[Category:Articles]]