Comparison of calculated and gradient AC/A ratios among normal, exophoria and esophoria

Abstract

AIM: To analyze the clinical application of calculated and gradient accommodative convergence/accommodation ratio(AC/A)in different eye positions.METHODS: A total of 127 myopes in ophthalmology were included. The calculated AC/A was obtained by near/distance phoria and the gradient AC/A was obtained by near addition +1.00D. The differences of eye positions of the calculated and gradient AC/A were compared. RESULTS:The calculated AC/A value was higher than the near +1.00D gradient AC/C(P0.05).CONCLUSION: The calculated AC/A is higher than the gradient AC/A, especially in patients with esophoria and emmetropia, it is easy to obtain high AC/A values by using the calculation method, resulting in erroneous diagnosis. The gradient method is more recommended.

Keywords

• accommodation convergence to accommodation ratio(ac/a)
• calculated ac/a ratio
• gradient ac/a ratio
• phoria