. "light streams out of our eyes" . "Emission theory (vision)" . "discrete rays which emanate from the eye" . "emission theory of vision, using logic and deduction from experiment. He showed Euclid's first postulate of Optics to be hypothetical only, and fails to account for his experiments." . "gaze stabilization" . "Emission theory of vision" . "Emission_theory_(vision)" . . . "viewer's eye was believed to emit rays" . "emission theory of vision" . . "emission theory" . "emitted by the eye" . . "Emission theory (vision)" . "emitted by them" . "extramission" . . "''emission theory''" . "emitted rays to cause vision" . "extramission theory" . "emitted" .