Duochrome Test | Red Green Test | FRIEND Test
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- Опубліковано 29 гру 2020
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A duochrome test is a test commonly used to refine the final sphere in refraction, which makes use of the transverse chromatic aberration of the eye. Because of the chromatic aberration of the eye, the shorter wavelengths (green) are focused in front of the longer red wavelengths.
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#optometryacademy #duochrometest #redgreentest #friendtest #optometry #optometrist #wavelength #Red #Green #binocular #akleshkumar
Loved this ❤️
Nicely explained 👍
Ok fine and thank you!
Now question arise!
1. In duochrome test why only red - green colour are used why not other colour?
2. Why duochrome test should not be perform whose visual acuity worse than 6/9 ?
Hope you will answer of these question.
Excellent explanation
Thank you 😊
very helpful sir
Sir I've a question...
Duochrome test is for:
a.subjective verification of refraction
b.subjective refinement of refraction
c.subjective binocular balancing
d.none
please reply sir
It's B
@@OptometryAcademy thank you sir
Why duochrome test not used with visual acuity less than 6/9 ??
Cause more than 0.50DS power are too small to distinguish between two colors(Red&Green)
It's great vedio.
Thank you 😊
Thanks..
I have a question:
U said "Optics of green better is:
We add +0.25 DS to make yellow light focused on retina" !
We are talking about green light! Why do we have to focus yellow(NOT Green) on retina?!
The same question about red.
Because when both sides, red and green, look the same, the yellow that is between red and green in LMS is placed right on retina.
Nicely explained, Aklesh Kumar :) Thumbs up :)
I would like to add few points and perhaps raise a question.
The question 1st: Why would you "dim the lights" during the R/G test?
When performing "normal visual acuity testing" you should always have normal lights on (daylight/artificial daylight), unless you are testing for specific conditions (f.e. Night driving), because it could also uncover other visual problems. The fact, that people will often tell you that the light is too bright for them (while it is "normal" for most people), could mean (among other things) that they could have a problem with their pupils not adjusting to light conditions properly, due to binocular problems (especially untreated heterophorias).
So my question is... is there a reason behind diming the lights for the R/G test?
As refraction can greatly differ between Photopic vision (under well-lit circumstances) and Scotopic vision (under dim or low light conditions), wouldn't you get "further from the TRUE refraction" if you measure the client for his new pair of "day glasses"?
The other point I would add to the video is, that even after you are done with R/G, the final "fine tuning" should take place when the client is looking way further than 6m (20 feet), ideally further than 30m (100 feet). THEN you should re-finetune. Many people test "ONLY inside" at 4m (13 feet), which alone alters the correct refraction by 0.25D due to the eye accommodating 0.25D at the closer eye chart, making people prescribe too small of a "minus lens" (-3,75 instead of the correct -4,00) or too strong of a plus lens (+4,25 instead of +4,00). These small differences can only be detected at longer distances, ideally making the client read a car sign or something better yet something smaller, on the edge of their visual acuity (so that the tiny difference is visible, and it is visible).
People often think 0.25D is nothing, but it is often the reason for "unsharp" vision in the distance area of a progressive lens (PAL)(client will lower his head saying "I can see better when I lower my head" as they are searching for the "more minus/less plus" part of the PAL. At the same time, in a PAL you are limiting the width of the distance areas, especially the peripheral sharpness.
Sorry for such a long comment, hope my point was clear :D
Thank you for this long comment. Really happy to read this.
We dim room light for better visibility and accuracy because other light creat scattering and Decrease Hue
If the patient as cyclindrical power. Then duochrome test is required??
No need.. we need to test JCC.. to verify cylinder power and axis
Sir kannadali madi videosna
Need lovely 😍💋 💝💖❤️
Sir hindi me bataye GE
Hi sir, plese explain in kannada language, to understand it better for someone like me
I know only Hindi and English. 😌
Nicely explained 👍