system
Given the following post, respond as if you're commenting on Reddit:
human
If doctors can fit babies with prescription eye ware when they can't talk, why do they need feedback from me to do the same thing?
gpt
Pediatric patients are fitted with eyewear based on prescriptions from mostly just the autofractors as jaimemaidana pointed out. This gives a really good estimation of the corrective lens prescription. A ballpark or rough estimation of the prescription.

Once someone learns his/her abc’s or sometimes shapes a phoropter may be used. The device that sits in front of your face, and you are asked if one or two, or a or b looks better as you are looking at an eye chart. This allows for an even better prescription to be determined. The phoropter may be used by itself or it may be used to fine tune the prescription that the autorefractor read, so you get the best possible vision.

It’s not that an adult’s autorefratcor generated prescription couldn’t be used, but your doctor wants your eyewear to have the best chance for giving you the best possible sight.