How to Refract Tutorial: Jackson Cross Cylinder Technique

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Subjective Refraction Tutorial Jackson Cross Cylinder Technique. Plus cylinder refraction with phoropter. Dr. David Guyton. Source: American Academy of Ophthalmology. Table of Contents:
00:25 Title/Intro
00:54 History
02:28 Subjective Refraction
02:55 Basics of Astigmatism and Cross Cylinder Testing
08:36 Sphere Refraction
13:51 Cross Cylinder Testing
22:28 Uninterrupted Refraction Example
24:41 Duochrome Testing
25:41 Binocular Balancing
27:50 Vertex Distance
29:17 Cycloplegic refraction
30:36 Determination of Reading Add
31:53 Documenting and Prescribing a Refraction
32:44 Conclusion
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Комментарии
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As always David Guyton is a brilliant ophthalmologist who was of great value as we worked on a proposal to help pilots avoid entry into myopia - if they had the technical and scientific interest to do so.

otiebrown
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Dr. David Guyton is a LEGEND. PLEASE PLEASE upload the rest of his videos. Thank you for this one its a gem!

doublevision.productions
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A special word of thanks to Dr. Guyton for providing me with a myopia prevention paper by Dr. Stirling Colgate.
It was of great value to me.

otiebrown
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EXCELLENT!!! Please upload A lot of Ophthalmic Technicians could use this information!!!!

lynalexander
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I was raised Presbyopian but I converted to Catholicism in 2013

mattjindrak
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Nice.
But, with 20/20, it is doubtful that "cylinder correction", is ever even necessary.
To avoid conflict on this issue, I measure my own refractive status, by using my Snellen and Test Lens Kit.
Refractive status = +0.5 Diopters.

otiebrown
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I find it easier to use my own test lenses, and my own Snellen.
Thus establishing my own OBJECTIVE refraction.
Since I can clear the 20/20 line, with SPHERICAL MINUS, (if necessary), there is no need to measure cylinder at all.
Currently, I measure 20/20, and check my refraction, objectively, using the "just blur", method, and my test plus lenses.
Thus, I will never ever enter into myopia ever again.
My best regards to Dr. Guyton, who helped us organize a true prevention method (as I described it ) at the USNA, with Dr. Montor and Dr Peter Greene.
Thank you so much David!
Otis S. Brown
Electrical Engineer
(Retired)

otiebrown