The eye lenses were collected from 90 hares of known age. Those which were preserved 4 days after an animal's death showed signs of incipient decay, especially in deterioration of the internal capsule. However, the associated weight loss of the lenses was only a few percent compared with freshly preserved lenses. Although lens weight increases with age, it is only possible to separate hares of the most recent generation from others on the basis of lens weight differences.
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