The Clinical Near Gradient Stimulus AC/A Ratio Correlates Better With the Response CA/C Ratio Than With the Response AC/A Ratio

What is it about?

A common method (the near gradient method) of assessing the influence of eye focusing in driving the size of a strabismus (squint) was thought to work by driving accommodation (focusing). However, this method correlated poorly with a "gold standard" method and actually correlated best with how much eye convergence drives focusing (the "CA/C" ratio)

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Why is it important?

The CA/C ratio is almost impossible to assess clinically. Using the near gradient "AC/A" method may help clinicians get a rough estimate of how much eye convergence drives accommodation. This may help them predict responses to common treatments such as surgery or glasses.