Maddox cross

The Maddox cross is a tangent scale for squint angle measurement and retinal correspondence testing.

Maddox cross

The Maddox cross is provided with two scales:

  • large-digit scale for 5 m testing distance
  • small-digit scale for 1 m testing distance

The numbers denote the angle in degrees. In the centre of the scale is a spot fixation light which should be located at eye level exactly opposite the patient during the examination.

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