The Maddox Rod test performed at 40 cm is called?

The Maddox Rod test performed at 40 cm is called?

• A. Modified Thorington
• B. Maddox Rod
• C. Wesson Card
• D. Von Graefe phorias

Answer: (A)

The near version of the Maddox rod test, done at about 40 cm and using a Thorington card, is called the Modified Thorington test. In this setup, one eye sees a line formed by the Maddox rod while the other eye sees a point on the Thorington card. The patient reports where the line aligns with the numbers on the card, and that alignment is read as a prism diopter value to quantify the near phoria. This combination specifically distinguishes it from the distance Maddox rod test (no Thorington card, used at distance) and from other methods like the Wesson card or Von Graefe phorias, which use different procedures.

The near version of the Maddox rod test, done at about 40 cm and using a Thorington card, is called the Modified Thorington test. In this setup, one eye sees a line formed by the Maddox rod while the other eye sees a point on the Thorington card. The patient reports where the line aligns with the numbers on the card, and that alignment is read as a prism diopter value to quantify the near phoria. This combination specifically distinguishes it from the distance Maddox rod test (no Thorington card, used at distance) and from other methods like the Wesson card or Von Graefe phorias, which use different procedures.