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The near Thorington Test Card measures the heterophoria using a combination card of numbers and letters quickly, normally used with a Maddox Rod lens or Maddox Rod occlude.
| Model | Near Thorington Test Card |
|---|---|
| Test Range | +/-18 diopters |
| Size | 15×9cm |
The near Thorington Test Card measures the heterophoria using a combination card of numbers and letters quickly, normally used with a Maddox Rod lens or Maddox Rod occlude.
There is a red-light bulb in the middle of the card, each optotype represents 1 prism diopter, and measures +/- 18 diopters.
Size: 15×9cm
Battery: two AA batteries
