Abstract
Having ruled out physical explanations, some atmospheric effects on luminance and wavelength that may affect the observer’s visual system or visual perception, and may provide partial explanations of the moon illusion, were also considered. In this chapter, attempts to explain the illusion in terms of some other processes taking place within the eye are examined. Changes in pupil size were proposed — and rejected — as a cause of changes in perceived size, and thus as a possible cause of the moon illusion. Image blur due to inadequate focusing with an enlarged pupil was also rejected, whether caused by chromatic aberration, spherical aberration, or night myopia. It was discovered that the nature of the visible terrain affected both the state of accommodation and perceived size, with changes in accommodation apparently causing the size enlargement. However, the visible terrain could also be directly responsible, through relative size effects or through changes in perceived distance.
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