2
$\begingroup$
  • When it was invented, different people were made to stand in lines according to their weights.
  • In each line, people with equal weights were made to stand together.
  • In the first line, there was a fat man.
  • The weights of people standing in subsequent lines decreased.
  • People standing in the eighth line were considered normal and healthy.

What was this invention which is still widely used along with its modified versions?

$\endgroup$

1 Answer 1

2
$\begingroup$

The invention is:

the Snellen chart, used by ophthalmologists to measure visual acuity:

Snellen chart example
Image source: Wikipedia

When it was invented, different people were made to stand in lines according to their weights.
In each line, people with equal weights were made to stand together.

Throughout this description, 'people' is used in place of letters. The Snellen chart consists of multiple rows/lines of block letters, grouped by size. In any given row, all letters are printed in the same size/weight font.

In the first line, there was a fat man.
The weights of people standing in subsequent lines decreased.

The first line consists of one very large letter, i.e. a fat man. As you go down the chart, the font size/weight decreases.

People standing in the eighth line were considered normal and healthy.

Being able to read the eighth line of the chart from the standard distance of 6 metres represents having '20/20 vision', the standard considered normal and healthy, and used as a reference point for diagnosing long- and short-sightedness.

The Snellen chart is still used today, albeit not necessarily in the exact same form as when it was first created.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.