Ferdinand Monoyer's 181st Birthday: Know about the inventor of 'eye test'
Ferdinand, born on 9 May 1836, is known for introducing the dioptre - the unit of measure of the optical power of a lens - in 1872.
May 09, 2017, 09:03 AM IST
Ferdinand, born on 9 May 1836, is known for introducing the dioptre - the unit of measure of the optical power of a lens - in 1872.
May 09, 2017, 09:03 AM IST