what is the legal distance of a eye test,ive heard its 3 mtrs/10 feet.is this co!

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The legal distance for examining the eye is either 6 meters or 20 feet, because it is rare to have rooms this big we usually use a 3m (10 feet) room and use a mirror to reflect the chart making the distance of the chart twice as long.
When the near vision is tested a hand held reading book is used with different texts, each getting smaller, this is held at your normal reading distance.
In the UK it is a legal requirement to examine the distance vision and the near vision. The only time I don't use the 6m chart is if someone has such poor vision that they have to get closer to the chart to see it, then I will measure the exact distance that the patient has to use to see the letters.

I'm an Optometrist

That's not an official test.

There is no "legal" distance for an eye test. However, you have to stand at a certain distance which will vary depending on the size of the letters/text/signs that you have to read.

you should go to doctors immediately.