a. What is the instrument shown above? b. What does it measure? c. A patient reports that the white arrows is point at the number 4 and the red arrow at 3. What does this mean?
b. What does it measure?
c. A patient reports that the white arrows is point at the number 4 and the red arrow at 3. What does this mean?
Answer a Maddox wing. Answer b Test for near heterophoria. A convenient hand held quick and efficient near test for heterophoria. Dissociation of the eyes is effected by means of a septum and the deviation determined by the apparent position of the white and red arrows relative to their scales. Esophoria and exophoria are measured by the horizontal scale, the right eye seeing the white indicator arrows whilst the left eye sees the scale. Hyperphoria is measured on the red vertical scale row of figures which is seen by the left eye and the red arrow by the right eye. Cyclophoria may be assessed by moving the red arrow pointer parallel to the horizontal scale. Each eye piece has cell spaces to accommodate the patient near prescription if required. Answer c The patient has a 4 dioptres exophoria and 3 dioptres hypophoria.
