Re: Infra-red vision vs. dark vision...
You can develop huge eyes then. They could have a different shape like an elongated sphere, hosted in an elongated skull as well. This would imply less eye mobility yet, and a narrower field of vision.
Another way to make up for the need of retinal surface is a spherical eye with multiple pupils and retinas. Three pupils closedly spaced, each with its own elongated camera, hosted in a single spherical eye, could double retinal surface within the same space.
Another solution is 3+ eyes.
Or maybe the vitreous humor could be substituted by biological optical fibers bringing the light to a multilayer retina, multiplying the retinal surface by the number of layers.
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