Measurement of Strabismic Angle Using the Distance Krimsky Test

The alternate prism cover test (APCT) is the most fre-quently used method to measure the angle of deviation in patients with strabismus, but it can only be used when both eyes have sufficient vision for fixation. In cases of sensory strabismus, severe amblyopia, and infantile strabismus, it is difficult to take measurements with the APCT due to in-sufficient vision or poor cooperation in these patients [1,2]. In such cases, the Hirschberg test or Krimsky test, which use corneal reflection for measuring the strabismic angle, are commonly used. Although these methods are useful in measuring the near angle of deviation, their accuracy for the distance angle of deviation is undefined because these methods use a near fixation-point [2,3]. When the differ-ence between the near and the distance angle of strabis-mus is substantial, a serious error may occur if strabismi