Apparently, many dogs are nearsighted - hence the need for prescription eyeglasses. But how to tell when you've got the prescription right? "Since a dog can't be asked to read letters on a chart, a dry, odorless bone is dangled in front of him. If he shows any interest, the optician knows that the test lenses are right" From April 1939 issue of Popular Science: Link - Thanks Charlie! |
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Maybe, tsitsi - I don't know if it's an April Fool's issue.
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April issue? Perhaps a joke?
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