1. I think the accuracy depends on the accuracy of the screen size as reported by your phone with the qr code, it seems to work well with Samsung S7 Edge.This app is really useful, but you need to read the instructions! You need two devices (phone or tablet) one to display the QR code which you hold up to your forehead.
2. Do a few face scans until you're getting close to the same number consistently so you know you're doing it right (or just use a ruler and a mirror, I'm not your dad).So the app kinda works, but is no way accurate... Depending on which device you use for the QR, you will not get an accurate PD... Using various android devices around my house, I was able to have a variance of 10mm in the apps! Additionally, my professionally measured PD is 69... Closest I got on the app was 53.pretty much unusable.
3. Thank you Acer!You need two phones to complete the scan, but the problem is every time it scanned my face, it gave a totally different number! That wasn't even close to the real measurements.For this app to work, you need two devices and you need to follow the instructions.
4. It's functional but I had to find one of my old phones, charge it, download the app, then the app was controlling the brightness of the phone so it couldn't focus on my face and the phone at the same time so I had to screenshot the qr code then it finally worked.
5. Install the app on a second phone and it uses the selfie camera to scan the QR code as a reference and also auto-detects your eye's and gives you a reading.
6. It uses the size of the QR code to calibrate the measurement: if the device with the QR code isn't pressed against your forehead, the measurement won't be accurate.
7. the app wants you to hold it up displaying the QR code on your forehead *and* see you thorugh the camera with the QR code.
8. Checked the average I got by measuring using the ruler method, and it was accurate to the average reading I got.
9. Like which way to look and where the light is coming from as well as just following directionsand using 2 devices.Had to take about 2 readings to get the hang of using the app properly, and then took 10 more to calculate my own average IPD.
10. Either this is some way to get on user information that doesn't need any special permissions or the person/s behind this app didn't spend two minutes thinking about the actual usage of the app.
11. *But* the app can only show the code *or* look through the camera, not both at the same time.