OT skills guide: Jackson Cross Cylinder

This video takes you through the technique and theory of using the Jackson Cross Cylinder to determine a patient’s astigmatism. This is used after determining the best vision sphere.

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[Mango]

As a patient, this helps reduce the anxiety of choosing. It has helped me have better understanding on what is the purpose of this phase scientifically. I don’t have astigmatism but my child does. Thank you for sharing this valuable information. Now I look forward to our next Ophthalmology visit.

[camelCased]

Important bit when dealing with patients who have seriously impaired vision since birth (nystagmus, ocular albinism, such as myself). They might have a very weak ability to judge the specific direction of lines in the distance. So, for example, if a patient who has problems with distinguishing vertical lines clearly is being asked if the circle looks sharper with lens one or two, they might base their reply solely on the horizontal-ish parts of the circle. They will have a very hard time deciding if the circle has become rounder or not because the vertical parts will look blurry to them because of their nerve-brain issues, so no lens can fix those. This might make subjective refraction much more difficult when you know that the patient sometimes is confused and might start giving conflicting answers when it comes to dealing with correction at more vertical angles.

[otiebrown]

It is good to see the debate on the difficulties of measuring cylinder- accurately.

[mayestico]

I am grateful for this video helps me understand the essence of astigmatism.

[almikdadalasaad]

no one have ever explained it better, thanx a lot.

[eduard]

Absolutely excellent video, thank you for sharing the knowledge with us.

[tabelangbrendainbrendain]

This really helped a lot we hope for many more videos

[astemet]

It was really useful to mee.. i was so confused about my degrees for cil

[CuriousDrifter]

The circle of least confusion was already placed on the retina at the end of the last video (best sphere) and verified by the duochrome test, why do we need to over minus the patient by -0, .25 before using JCC?

[nsr]

Hi, I have a doubt in +1 blur test, Is it not necessary that patient should read 6/18?

[rehmanakudi]

I don't think it's a good way of teaching JCC...we were taught a much better way by professor Barratt and Prof Elliott at Bradford uni...check his book out... Primary Eye Care. Not saying this is wrong...just over complicating what in essence is a pretty simple task.

[m.a]

3:00 that's wrong! The position of handle should be parallel to trial cyl...

[ansuneldelarey]

You don't leave the patient on "red best" to start "over minus" them.... you over minus them before JCC but that would be green best?!

[raptorial]

you hand hesitates yoo much so I think axis in 45 degree was not accurate
but geberally thx for illustrate

[ugochinnamdi]

Could have been a great video but you were too fast. Thank you all the same

[temakapoo]

Why is she talking in this way !
Discusting