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OK. Better phrasing could have helped.

The site you linked requires too many violations of basic physics to actually work the way they explained. Still the effects they try to explain may have some observable truths.

I'll give you a twilight/half-light/dreamtime/purple haze time before light was divided from dark.

I'll give you Venus has a more recent history. Compare Venus to Mars. Mars has less gravity than Venus, about the same magnetic field, and a negligible atmosphere attributed to solar wind blasting it into space due to no protective magnetic field. Being further from the sun it has much less solar wind than Venus. Lower gravity and lower solar wind should just about offset each other.

Yet Venus crowded in close to the sun, and with no magnetic field to speak of has an immensely thick deep atmosphere.

That simply has to be more recent.

I wouldn't put too much stock in Lemurs, Tarsiers, and Bush Baby eyes being large being an indicator of anything more than being nocturnal animals.

For that matter, nearly all us mammals were nocturnal when dinosaur ruled the day. For the most part we all lost color vision in preference to being able to see anything in dim light.

A few mammals regained "full" color vision, mostly old world primates.

Ever egotistical, the top primate (primate, literally the First/Highest Order) declares the not only is he Homo Sapiens Sapiens (Man, the Wise, the very Wise) he has "Full" color vision. After all WE call see ALL the colors, red, green and blue!

Birds and lizards who see red, green, blue and one or two shades of ultraviolet laugh at us behind our backs...

But I digress.

Homo Neanderthalensis does indeed have big eyes. Big nose too.

I'd like to point out these are both adaptations for nocturnal activity.

Perhaps (finally getting back to something close to the original thread topic) the reason we and they could share caves is because we worked different shifts!