Theory 53/Organism/Vision
Eye Size Is Acuity Against Noise
The claim
Eye size is set by the ratio of required acuity to photon noise, so nocturnal animals need larger eyes for the same resolution.
01Mechanism
Resolution requires many photoreceptors, and dim light limits photons per receptor; the ratio sets the size needed.
02Prediction
Eye size should track the ratio.
03Refutation
Eye size tracking acuity alone would remove light level.