AC/A ratio (Accommodative convergence/ Accommodation ratio)
![AC/A ratio Calculated heterophoria method](https://optominsight.com/wp-content/uploads/2023/05/Screenshot-9-2-768x108.png)
Accommodative convergence/ Accommodation ratio also known as AC/A ratio, is a measurement of changes in accommodative convergence in prism diopters induced when the patient exert or relax 1 diopter of accommodation. Changes in the accommodation are either evoked by placing…