Is it normal that during an eye examination at the optician, the preliminary measurement with the auto-refractometer often results in half a diopter less than the subsequent main measurement with the phoropter?
(3 votes)
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Hello,
Yeah, that’s normal. Finally, the autorefractometer is only an objective measurement method, by means of which the optician approximately knows what misunderstanding you have.
Only the subjective measurement by means of phonopter or classic measuring glasses will give you and the optician the most accurate result.
Thank you for the star.
Of course, this is normal and in fact not equivalent to a subjective refraction. Such a measurement is just a rough directional value which does not deviate to the spectacle lens determination.
One of my fellowtones recently reported a deviation of 2.00 diopters compared to the value that the actual refraction yielded. The optician did not have a concrete explanation, but it was suspected that the cause could lie in the shaking of one eye.
A slight deviation as with you of only 0.50 dioptrics would not irritate me now.
If the autorefractometer would provide completely correct results, a measurement with the phoropter would no longer be necessary. The fact that the Phoropter is not obsolete should tell you that this is normal that it is just an approach.
What makes you so excited that you ask the question again?
It was already in other answers that you are not satisfied with, but then again the same because it is simply a fact:
Authorefraktometer: Grobe Measurement for orientation in advance.
Subjective refraction method: Precise Determination of the values for spectacle lens or contact lens.
This has nothing to do with dissatisfaction, I’m just interested.