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Alternatives for the Forced-Choice Tests
| Tests | Grating Visual Acuity | Tumbling E Visual Acuity | Direction of Motion |
|---|---|---|---|
| Forced choices | Horizontal | Up | Horizontal (left or right) |
| Vertical | Down | Vertical (up or down) | |
| Diagonal left | Left | Diagonal left down to right up | |
| Diagonal right | Right | Diagonal left up to right down | |
| Diagonal right down to left up | |||
| Diagonal right up to left down | |||
| Number of alternatives | 4 | 4 | 8 |
