Abstract
The plexus of retinal blood vessels was made visible by moving the shadow across the retina in a controlled manner. Frequency of scanning, amplitude of shadow movement, illuminance, contrast and other parameters were varied while flicker was minimised. Reciprocity between diameter and frequency of scanning (to give a constant speed of shadow movement) was not found. Other results were consistent with the view that the shadows normally form a low-contrast, diffuse, stationary image, and that smooth movements similar to the natural drift movements are adequate for making such a stationary image visible.
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