Maddox Vs Awaya Cyclodeviation
Test
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The Maddox
Rod test measures the same condition the Awaya
Test for Cyclodeviation does: the size of a cyclodeviation. However, compared to
the Awaya test it is crude, and dissociating and does not control accommodation:
For the Maddox test, you use multi-cylinders in the trial
case to convert the image of a light into that of a line, one red and one white.
Rotate one or the other to get them aligned and then read off the degrees in the
trial frame, compare the degrees and if they are not the same, the difference is
the amount of cyclodeviation.
This test condition is very dissociating since the only
thing in the visual field of both eyes is that light. There is no peripheral
material to be viewed, so this may be more cyclodeviation than the patient
actually is suffering from under normal viewing conditions. But that light does
not require much sharpness of focus to see, so the patient may not be properly accommodating
especially when the test is performed at the usual near or reading distance.
This could result in an underestimation of the cyclodeviation that the
patient really has under normal binocular viewing. Using the book of the Awaya
test and the targets therein, which require fair control of accommodation, one
will determine more accurately the actual cyclodeviation the patient actually
suffers from.
Awaya Cyclodeviation Test
Aniseikonia
Technical Bulletin (pdf)
Aniseikonia
And Cyclodeviation Index
Richmond
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