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They can do it with machines now without having someone say "better/worse" verbally... so it is completely valid.
((((sigh))))) Again...what is this machine? You apparently know what it is, right? Prove it.
Easy man / Woman and all others
Simply escalate and start a quick search in the search engine (you know them i think if not, e.g. Google, bing DuckDuckGo)
For example
Teller Cards
Or
visually evoked cortical potential, VECP
warm regards
there is nothing assholish in his response... unlike your response. but thats classic you.
Your comment is too thought provoking. You’ve intimidated me so I have to downvote you.
They may have used an auto-refractor. It requires no verbal interaction with the patient. It creates an extremely accurate prescription. I first encountered them at the Japanese company Hoya in the late 1980's. It measures the refraction of the light shone that enters the eye- which is a lens after all.
You can determine a non-verbal child needs glasses from a number of simple tests.
You could argue that these auto- refractors should be better known, it does the job of determining the prescription for lenses in a few minutes - but it would put a lot of optometrists out of work. Many optometrists use them, but go through the whole ancient "phoropter" machine routine ( Better ? worse ?) to justify their charges.