Strabismus

• Maddox wing

  Dissociates the eyes for near fixation and measures heterophoria
• Maddox wing

  1. The right eye sees a white vertical arrow and a red horizontal arrow

  2. The left eye sees horizontal and vertical rows of numbers
• Measuring horizontal deviation


  Ask the patient which number the white arrow points to
• Measuring vertical deviation

  Ask the patient which number the red arrow intersects
• Measuring cyclophoria

  Ask the patient to move the red arrow so it is parallel to the horizontal row of numbers
• Maddox rod

  A lens of red colored glass of 4-5 cylinders, put in front of one eye in the trial frame
• Maddox rod

  • For distant fixation
  • Changes the spot of light to a red line
• Using the Maddox rod

  1. Patient seated in a dark room wearing their glasses

  2. Spot of light at 6 meters
• Results from using the Maddox rod

  • Horizontal deviation: Orthophoria, Exophoria, Esophoria
  • Vertical deviation: Orthophoria, R hyperphoria, L hypophoria
  • Cyclophoria: Red line runs obliquely

  
• Measuring the angle of deviation

  1. Use a tangent scale on the wall

  2. Use prisms to bring the red line and spot together
• Measuring cyclophoria

  Rotate the Maddox rod until the red line appears horizontal