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Schematic drawing for the calculation of the field of view subtended at the eye of the participant: (EG) eyeglasses, (BPS) back-projection screen, (D) diameter of the stimuli, (D′) apparent diameter of stimuli viewed through the eyeglasses, (T) distance between the BPS and the EG, (t) distance between the EG and the first nodal point (N) of the eye, (FOV) field of view subtended at the eye
