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The recovery of binocular visual acuity of eight normal kittens placed in darkness for 10 days that began at the ages shown. Grey regions depict the period of darkness. One of the two kittens that experienced darkness from P47 (C176; white circle symbols) developed uveitis, so that measurements of the recovery of vision had to be curtailed after five weeks. Solid lines indicate linear functions that have been fitted to the individual data for each kitten.
