Application Process for Medical Certification - Examination Equipment and Techniques
Item 54. Heterophoria

  1. Red Maddox rod with handle.
  2. Horizontal prism bar with graduated prisms beginning with one prism diopter and increasing in power to at least eight prism diopters.
  3. Acceptable substitutes: any commercially available visual acuities and heterophoria testing devices.

  4. There are specific approved substitute testers for color vision, which may not include some commercially available vision testing machines. For an approved list,
    see Item 52. Color Vision.

Examination Techniques
Test procedures to be used accompany the instruments. If the Examiner needs specific instructions for use of the horizontal prism bar and red Maddox rod, these may be obtained from a RFS.