On 08/06/2021 11:26, Dave Plowman (News) wrote:
In article ,
Steve Walker wrote:
As an aside, does anyone else feel that an eye-test where you are
asked if different lenses are clearer or not isn't very scientific?

There isnt any other way to do it.

There is - an Autorefractor.

Yup. You can correct eyesight in an animal unable to communicate.

Or, I assume, a human unable to read.

You must have noticed that your optician starts with correction very
nearly there - even for a first prescription. Because he's measured the
power of your eye first.

Do all opticians use autorefractors now, at least to start the
diagnostic process?

--

Jeff