| 11. | This size difference in area V1 correlated with the 17 % illusory difference between the perceived visual angles.
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| 12. | The determined threshold was a height of 45 degrees of visual angle for the height of the surface.
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| 13. | Size and shape were determined by the visual angle subtended at the eye combined with perceived distance and orientation.
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| 14. | They are outside because moving away from the computer screen has decreased the visual angle of the lilac spots.
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| 15. | The image is magnified, perhaps giving it a visual angle similar to the real scene the picture is depicting.
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| 16. | In fisheye lenses, the visual angle is close to or more than 180 degrees in at least one direction.
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| 17. | It is replaced by a perceptual SDIH, in which the visual angle is replaced by the perceived visual angle.
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| 18. | It is replaced by a perceptual SDIH, in which the visual angle is replaced by the perceived visual angle.
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| 19. | The difference between those real directions ( ) is, again, the visual angle " ? ".
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| 20. | The diagram shows the relative acuity of the human eye on the horizontal meridian in degrees visual angle from foveal vision.
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