Eye test: How accurate are devices?
I remember having to read numbers on a wall, but now you sit in front of a device that measures your eyesight. How accurate is the result?
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You mean the Phoropter?
https://www.augenzentrum.net/eye examination/phoropter-subjective-refraction/#:~:text=What%20 is%20Phoropter%3F,equivalent%20of%20refraction errors%20ben%C3%B6tigt%20.
The result is as accurate as you make your information. If you make incorrect information, the result will also be incorrect.
So it is not on the device, but on you, whether you recognize all the letters/numbers up to the smallest row.
Is that the optic?
Yes, of course. Optics are the best trained professionals for visual testing. They take much more time for you than any ophthalmologist.
The result of what such an automatic device is anything but accurate; it shows only an approximate point of reference for a possible misunderstanding.
In general, I go to the ophthalmologist only to make the precautionary examination of the retina (in some cases very short-sighted and therefore have an increased risk of retina damage), when it comes to the determination of lens thicknesses, one is at the right address for an optician, because this is not the responsibility of ophthalmologists.
It’s important what you mean. There are the so-called refractometers that measure your eyes, they are relatively accurate. However, after these values one should not produce glasses, because these computers measure only the individual eye and cannot determine how seeing is with both eyes. This so-called binocular vision is therefore not possible.
As a second device, the already mentioned phoropter comes into question, he does not measure anything, he is nothing other than the probier glasses in which you use glasses to measure the subjective and objective vision.
Ophthalmologists like to use the computer because they have not learned the refraction at all, this is the subject of the opticians. They then write on a note, the optician should make the exact measurement.
But with my eye doctor I only had a refractor and then the doctor gave me a note with my worth
As I described. You don’t need an ophthalmologist when it comes to glasses.
Very accurate.