A comment: Mackay Rays shimmer due to accommodation changes.
Department of Psychology, University of Bristol, U.K.
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Gregory
D000065:Accommodation, Ocular / Q000502:physiology*; D001921:Brain / Q000502:physiology; D006801:Humans; D007908:Lens, Crystalline / Q000502:physiology; D009799:Ocular Physiological Phenomena; D010364:Pattern Recognition, Visual; D012438:Saccades