Trial lens kit - Revision history

Dlskidmore: formatting

2020-07-16T17:17:27Z

formatting

← Older revision		Revision as of 17:17, 16 July 2020
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	*[https://www.reviewofoptometry.com/article/sharpen-your-subjective-refraction-technique Sharpen your Subjective Refraction Technique]		*[https://www.reviewofoptometry.com/article/sharpen-your-subjective-refraction-technique Sharpen your Subjective Refraction Technique]

	===Lecture Format Videos==		===Lecture Format Videos===
	* [https://youtu.be/cdZo7QPcQt8 Intro to Subjective Refraction]		* [https://youtu.be/cdZo7QPcQt8 Intro to Subjective Refraction]
	* [https://youtu.be/zFOLy90ynuk Lecture: Refraction: A Step Up From the Basics]		* [https://youtu.be/zFOLy90ynuk Lecture: Refraction: A Step Up From the Basics]

Dlskidmore: header depth

2020-06-11T16:08:43Z

header depth

← Older revision		Revision as of 16:08, 11 June 2020
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	Medical: If you have any vision problems not compensated for by refraction, go see your [[optometrist]].		Medical: If you have any vision problems not compensated for by refraction, go see your [[optometrist]].

	= Minimalist Trial Lens Kit =		== Minimalist Trial Lens Kit ==
	A small kit that will allow you to test small changes to your wearing lenses would be:		A small kit that will allow you to test small changes to your wearing lenses would be:
	* +/-0.25 and +/-0.5 [[#Flippers]]		* +/-0.25 and +/-0.5 [[#Flippers]]
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	* [[Snellen Chart]]		* [[Snellen Chart]]

	= Trial frames =		== Trial frames ==
	Trial frames are frames which you can mount trial lenses in and wear like glasses. They come in many forms, they may have lots of adjustments or come in fixed PD widths. Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses. Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens. A trial frame that holds four lenses and has axis adjustment is best.		Trial frames are frames which you can mount trial lenses in and wear like glasses. They come in many forms, they may have lots of adjustments or come in fixed PD widths. Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses. Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens. A trial frame that holds four lenses and has axis adjustment is best.

	== Placing lenses in the trial frame ==		=== Placing lenses in the trial frame ===
	Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]]. Line up the lines on [[cylinder]] lenses with the [[axis]] of [[astigmatism]]. There may be a dial that helps rotate the cylinder lens.		Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]]. Line up the lines on [[cylinder]] lenses with the [[axis]] of [[astigmatism]]. There may be a dial that helps rotate the cylinder lens.

	= Flippers =		== Flippers ==
	Flip lenses are designed to be hand held in front of the trial lens or customary lenses and test plus vs minus at a set power. Can be used to determine if the customary lenses need tweaking up or down. They may be monocular or [[binocular]] They are also used in [[vision training]].		Flip lenses are designed to be hand held in front of the trial lens or customary lenses and test plus vs minus at a set power. Can be used to determine if the customary lenses need tweaking up or down. They may be monocular or [[binocular]] They are also used in [[vision training]].

	= How to test myopia with a trial lens kit =		== How to test myopia with a trial lens kit ==
	You will use the sphere lenses for this test.		You will use the sphere lenses for this test.
	This is a very extensive topic		This is a very extensive topic
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	* [https://youtu.be/j48PMpFKxBo Trial Frame Refraction: More Than Just “1 or 2?”]		* [https://youtu.be/j48PMpFKxBo Trial Frame Refraction: More Than Just “1 or 2?”]

	= How to test Astigmatism =		== How to test Astigmatism ==
	Testing for [[astigmatism]] is tricky, and you should master testing for myopia first. Errors such as being off by 90 degrees are common.		Testing for [[astigmatism]] is tricky, and you should master testing for myopia first. Errors such as being off by 90 degrees are common.

	== JCC Lens ==		=== JCC Lens ===
	The JCC Lens has two cylinders at opposite angles and powers. By holding the lens in different ways over a trial cylinder lens, you can determine if the angle or power of the cylinder lens should be changed. (This is the part of the refraction test where the doctor is happy if both options are equally blurry.)		The JCC Lens has two cylinders at opposite angles and powers. By holding the lens in different ways over a trial cylinder lens, you can determine if the angle or power of the cylinder lens should be changed. (This is the part of the refraction test where the doctor is happy if both options are equally blurry.)
	* [https://youtu.be/ba4ck7oYauY JCC - Example 1 Emily 2/4]		* [https://youtu.be/ba4ck7oYauY JCC - Example 1 Emily 2/4]

	== Stenopeaic Slit ==		=== Stenopeaic Slit ===
	A stenopeaic slit is just an opaque disk with a slit in it. By putting the slit at different angles and taking standard myopic refraction, one can calculate the angle and power cylinder needed.		A stenopeaic slit is just an opaque disk with a slit in it. By putting the slit at different angles and taking standard myopic refraction, one can calculate the angle and power cylinder needed.
	* [http://www.journalrepository.org/media/journals/OR_23/2018/Feb/Chowdhury822018OR39503.pdf Stenopeaic Slit: A Diagnostic and Refractive Tool]		* [http://www.journalrepository.org/media/journals/OR_23/2018/Feb/Chowdhury822018OR39503.pdf Stenopeaic Slit: A Diagnostic and Refractive Tool]

	== JCC vs Stenopeaic ==		=== JCC vs Stenopeaic ===
	The use of a Stenopeaic slit vs a JCC lens seems to be cultural. Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit. The stenopeaic slit may be more useful for very high astigmatism. Both tests work for low to moderate astigmatism and it's more about how your doctor was trained which he/she will use. For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.		The use of a Stenopeaic slit vs a JCC lens seems to be cultural. Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit. The stenopeaic slit may be more useful for very high astigmatism. Both tests work for low to moderate astigmatism and it's more about how your doctor was trained which he/she will use. For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.

	= Pinhole =		== Pinhole ==
	The pinhole accessory in many trial lens sets may help distinguish between refractive issues and medical issues. If the vision does not improve or gets worse with use of the pinhole lens, this is an issue that should be addressed by an [[optometrist]].		The pinhole accessory in many trial lens sets may help distinguish between refractive issues and medical issues. If the vision does not improve or gets worse with use of the pinhole lens, this is an issue that should be addressed by an [[optometrist]].

Dlskidmore: new link, new headers

2020-06-11T16:07:51Z

new link, new headers

← Older revision		Revision as of 16:07, 11 June 2020
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	= How to test myopia with a trial lens kit =		= How to test myopia with a trial lens kit =
	You will use the sphere lenses for this test.		You will use the sphere lenses for this test.
	This is a very extensive topic~~, here are some lectures for optometrist students~~:		This is a very extensive topic
			===HowTos===
			*[https://www.reviewofoptometry.com/article/sharpen-your-subjective-refraction-technique Sharpen your Subjective Refraction Technique]

			===Lecture Format Videos==
	* [https://youtu.be/cdZo7QPcQt8 Intro to Subjective Refraction]		* [https://youtu.be/cdZo7QPcQt8 Intro to Subjective Refraction]
	* [https://youtu.be/zFOLy90ynuk Lecture: Refraction: A Step Up From the Basics]		* [https://youtu.be/zFOLy90ynuk Lecture: Refraction: A Step Up From the Basics]

Dlskidmore: more trial frame details

2020-06-11T02:47:15Z

more trial frame details

← Older revision		Revision as of 02:47, 11 June 2020
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	= Trial frames =		= Trial frames =
	Trial frames come in many forms, they may have lots of adjustments or come in fixed PD widths. Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses. Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens. A trial frame that holds four lenses and has axis adjustment is best.		Trial frames are frames which you can mount trial lenses in and wear like glasses. They come in many forms, they may have lots of adjustments or come in fixed PD widths. Using a frame with the correct PD is important so the wearer is looking through the optical centers of the lenses. Adjust the frame for the best comfort and so the wearer is looking through the optical center of the lens. A trial frame that holds four lenses and has axis adjustment is best.

	== Placing lenses in the trial frame ==		== Placing lenses in the trial frame ==
	Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]].		Always place the strongest lens in the stack closest to the eye to reduce the effects of [[vertex distance]]. Line up the lines on [[cylinder]] lenses with the [[axis]] of [[astigmatism]]. There may be a dial that helps rotate the cylinder lens.

	= Flippers =		= Flippers =
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	== JCC vs Stenopeaic ==		== JCC vs Stenopeaic ==
	The use of a Stenopeaic slit vs a JCC lens seems to be cultural. Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit. Both tests work and it's more about how your doctor was trained which he/she will use. For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.		The use of a Stenopeaic slit vs a JCC lens seems to be cultural. Most US doctors will use JCC lens, while middle eastern doctors prefer the stenopeaic slit. The stenopeaic slit may be more useful for very high astigmatism. Both tests work for low to moderate astigmatism and it's more about how your doctor was trained which he/she will use. For DIY types, the stenopeaic slit is easy to make at home and is compatible with the simpler cm [[measurement]] when a full trial lens kit is not available.

	= Pinhole =		= Pinhole =

Viceroy Sam: /* top */bolding

2020-06-03T22:47:59Z

top: bolding

← Older revision		Revision as of 22:47, 3 June 2020
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	A trial lens kit is a set of lenses of various powers and usually a frame shaped like a pair of glasses but with mounting points for the lenses. The number of lenses and powers will vary by what kit you buy. If you are a very high myope, try to find a kit that includes powers close to your [[prescription]].		A '''trial lens kit''' is a set of lenses of various powers and usually a frame shaped like a pair of glasses but with mounting points for the lenses. The number of lenses and powers will vary by what kit you buy. If you are a very high myope, try to find a kit that includes powers close to your [[prescription]].

	Legal: Check your local laws before performing any trial lens tests on someone other than yourself. This may require a licence in your jurisdiction.		Legal: Check your local laws before performing any trial lens tests on someone other than yourself. This may require a licence in your jurisdiction.

Divenal: /* How to test Astigmatism */ linkify

2020-06-02T08:48:41Z

How to test Astigmatism: linkify

← Older revision		Revision as of 08:48, 2 June 2020
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	= How to test Astigmatism =		= How to test Astigmatism =
	Testing for astigmatism is tricky, and you should master testing for myopia first. Errors such as being off by 90 degrees are common.		Testing for [[astigmatism]] is tricky, and you should master testing for myopia first. Errors such as being off by 90 degrees are common.

	== JCC Lens ==		== JCC Lens ==

Dlskidmore: /* How to test Astigmatism */ pretty up links

2020-06-01T16:54:55Z

How to test Astigmatism: pretty up links

← Older revision		Revision as of 16:54, 1 June 2020
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	== JCC Lens ==		== JCC Lens ==
	The JCC Lens has two cylinders at opposite angles and powers. By holding the lens in different ways over a trial cylinder lens, you can determine if the angle or power of the cylinder lens should be changed. (This is the part of the refraction test where the doctor is happy if both options are equally blurry.)		The JCC Lens has two cylinders at opposite angles and powers. By holding the lens in different ways over a trial cylinder lens, you can determine if the angle or power of the cylinder lens should be changed. (This is the part of the refraction test where the doctor is happy if both options are equally blurry.)
	* https://youtu.be/ba4ck7oYauY		* [https://youtu.be/ba4ck7oYauY JCC - Example 1 Emily 2/4]

	== Stenopeaic Slit ==		== Stenopeaic Slit ==
	A stenopeaic slit is just an opaque disk with a slit in it. By putting the slit at different angles and taking standard myopic refraction, one can calculate the angle and power cylinder needed.		A stenopeaic slit is just an opaque disk with a slit in it. By putting the slit at different angles and taking standard myopic refraction, one can calculate the angle and power cylinder needed.
	* http://www.journalrepository.org/media/journals/OR_23/2018/Feb/Chowdhury822018OR39503.pdf		* [http://www.journalrepository.org/media/journals/OR_23/2018/Feb/Chowdhury822018OR39503.pdf Stenopeaic Slit: A Diagnostic and Refractive Tool]

	== JCC vs Stenopeaic ==		== JCC vs Stenopeaic ==

Dlskidmore: /* How to test myopia with a trial lens kit */ Give links titles, nuke the low quality student video.

2020-06-01T16:53:17Z

How to test myopia with a trial lens kit: Give links titles, nuke the low quality student video.

← Older revision		Revision as of 16:53, 1 June 2020
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	You will use the sphere lenses for this test.		You will use the sphere lenses for this test.
	This is a very extensive topic, here are some lectures for optometrist students:		This is a very extensive topic, here are some lectures for optometrist students:
	* ~~https://youtu.be/j48PMpFKxBo~~		* [https://youtu.be/cdZo7QPcQt8 Intro to Subjective Refraction]
	* https://youtu.be/cdZo7QPcQt8		* [https://youtu.be/zFOLy90ynuk Lecture: Refraction: A Step Up From the Basics]
	* https://youtu.be/zFOLy90ynuk		* [https://youtu.be/j48PMpFKxBo Trial Frame Refraction: More Than Just “1 or 2?”]
	A ~~shorter overview of~~ the ~~process:~~
	* https://~~www~~.~~youtube.com~~/~~watch~~?~~v=HjRcdlXmR1A~~

	= How to test Astigmatism =		= How to test Astigmatism =

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

2020-05-28T19:49:24Z

nuking "prescription" where that is not what is meant

← Older revision		Revision as of 19:49, 28 May 2020
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	A trial lens kit is a set of lenses of various powers and usually a frame shaped like a pair of glasses but with mounting points for the lenses. The number of lenses and powers will vary by what kit you buy. If you are a very high myope, try to find a kit that includes powers close to your [[~~Full Prescription~~]].		A trial lens kit is a set of lenses of various powers and usually a frame shaped like a pair of glasses but with mounting points for the lenses. The number of lenses and powers will vary by what kit you buy. If you are a very high myope, try to find a kit that includes powers close to your [[prescription]].

	Legal: Check your local laws before performing any trial lens tests on someone other than yourself. This may require a licence in your jurisdiction.		Legal: Check your local laws before performing any trial lens tests on someone other than yourself. This may require a licence in your jurisdiction.
Line 6:		Line 6:

	= Minimalist Trial Lens Kit =		= Minimalist Trial Lens Kit =
	A small kit that will allow you to test small changes to your ~~existing prescription~~ would be:		A small kit that will allow you to test small changes to your wearing lenses would be:
	* +/-0.25 and +/-0.5 [[#Flippers]]		* +/-0.25 and +/-0.5 [[#Flippers]]
	* [[#Stenopeaic Slit\|stenopeaic slit]]		* [[#Stenopeaic Slit\|stenopeaic slit]]

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

2020-05-25T00:10:18Z

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

← Older revision		Revision as of 00:10, 25 May 2020
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	= Pinhole =		= Pinhole =
	The pinhole accessory in many trial lens sets may help distinguish between refractive issues and medical issues. If the vision does not improve or gets worse with use of the pinhole lens, this is an issue that should be addressed by an [[optometrist]].		The pinhole accessory in many trial lens sets may help distinguish between refractive issues and medical issues. If the vision does not improve or gets worse with use of the pinhole lens, this is an issue that should be addressed by an [[optometrist]].

			==References==
			{{reflist}}

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