this post was submitted on 05 Dec 2023
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Virtual Reality
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be warned those apps are not perfectly accurate. I used android apps that take a card as reference and also the one using iphone face scan measurements, they were 2 to 3mm wider than what my real far ipd ended up being. I even had an optometrist do multiple far ipd measurements, those lined right up with this paper method. To remove bias i also made sure to mix 10 papers at .5mm steps and checked them all.
So your optometrist is very likely correct, but the paper method is also, never trust an app.