Which two theories describe how vision works by describing rays either emitted from the eye or reflected into the eye?

• A. Extramission theory and intromission theory
• B. Photoreception theory and Transmission theory
• C. Refractive theory and Apposition theory
• D. Neural theory and Cognitive theory

Answer: (A)

Two classical ideas about how vision works describe rays either leaving the eye or entering it. In the extramission model, the eye emits rays that reach objects. In the intromission model, light rays leave objects, travel to the eye, and are received by the retina. The option pairing extramission theory and intromission theory matches this ray-based description of vision, which is why it’s the best choice. The other pairings don’t describe the same mechanism: they refer to different notions about light and perception, such as optics or processing, rather than rays emanating from or entering the eye.