A comment: Mackay Rays shimmer due to accommodation changes.
Gregory
R L
RL
Department of Psychology, University of Bristol, U.K.
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