| 1 | And lazy eye ( amblyopia) occurs. | |
| 2 | It is not possible to treat amblyopia after this age. | |
| 3 | Some bats with poor eyesight depend on echolocation to navigate. | |
| 4 | Retinal implants that help the partially sighted are being developed as bionic eyes. | |
| 5 | "The relevance to human amblyopia is questionable, " he says. |
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