How large can an animal's eye realistically get?

The largest eye in the world belongs to the giant squid, which has eyes up to 27 cm in diameter (some reports from the 1800s say 40 cm). Extinct ichthyosaurs also had very large eyes, 20-30 cm in diameter. How large can eyes realistically get? What evolutionary pressures could result in obscenely large eyes?

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How large can an animal's eye realistically get?

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