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Google's doodle of today honours ophthalmologist Ferdinand Monoyer
The internet search engine giant Google has honoured French ophthalmologist Ferdinand Monoyer on his 181st birthday with a simple animated doodle on its home page today.

The animated doodle highlights the Monoyer chart that tests your visual clarity and power of the eyeball lens. Opticians know it that each row of the chart represents a different lens power in dioptre ranging from smallest to largest. The lenses of the spectacles are made to correct the eye lens vision according to this chart.

The French ophthalmologist, born 181 years ago, developed the dioptre, a unit of measure of the optical power of a lens or curved mirror. Still in use today, it measures the distance you'd have to be from the text to see it clearly.

The method for eye power testing hasn't changed a great deal and one has to read from rows of gradually shrinking letters until one is not able to distinguish the shapes anymore.

In the chart as a part of the doodle, if one reads upwards on both ends from the second line from the bottom, ophthalmologist Monoyer's first and last names can be seen.

I still remember that in the school science course, we used to remember the statement that 'dioptre is the unit of power of a lens as reciprocal of its focal length in meters'.

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