Angle of deviation on fixation at distance and near measured with the alternating prism cover test
| *Left over right | |
| At 6 metres | 5 prism dioptres L/R* |
| At 6 metres with –1D lens | 8 prism dioptres L/R |
| At 6 metres with –2D lens | 14 prism dioptres L/R |
| At 6 metres with –3D lens | 25 prism dioptres L/R |
| At 33 cm | 30 prism dioptres L/R |
| At 33 cm with +3D lens | 30 prism dioptres L/R |
| At 33 cm with 10 prism dioptres base in | 15 prism dioptres L/R |