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1 janv. 1868 - US ophthalmologist John Green perfects the fan and block test for astigmatism 1868

Ajouté au bande de temps:

The development of optometry through the ages

ByChristian Pot
10 avr. 2021
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763

Date:

1 janv. 1868
Maintenaint
~ Il y a 157 ans
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