Station six
(allowed 5 minutes)
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Using the heterophoria method, calculate the AC/A (accommodative convergence / accommodation) ratio using the following values (assuming the patient is emmetropic):
 
  • Interpupillary distance                =  60 mm
  • Alternate cover test 

  •            at the distance (6 metre)  = 36 prism dioptres esophoria
               at near  (33 cm)                 = 30 prism dioptres esophoria
 

 

 
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