system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why amblyopia (lazy eye) cannot be surgically or anyhow treated at adulthood? I know that if treated properly at childhood that eye can function normally, but why is it hard to develop it later?
gpt
The brain is naturally ~~lazy~~ efficient. If it's getting bad information from the opic nerve in the lazy eye, it'll choose to ignore and favor the good eye. As a person gets older, the brain may completely cut off information from that nerve, even if the lazy eye is fixed surgically.

You want to treat the lazy eye early before a person ages enough that the brain cuts off signal from the lazy eye.