Accurately measure your pupillary distance (p.d.)
You want to order glasses from your favourite online store. All you need is a standard credit card and your iPhone. Take your photo and slide the left and right sights over the pupil centres very, very, easy to use.
Automatic feature helps to preset rulers on the picture quickly with further manual adjustment for accurate measurements..
Pupillary Distance is needed when you want to order eyeglasses. Now you can measure it yourself using this app or ask your friend to measure your PD. You have options to estimate the PD automatically and tune the measurement manually.
Millimeters or inches are used to show the results.
The black magnetic stripe on cards (e.g credit card) is used as a reference for measurements. You can also estimate the pupil distance without any reference - in this case Face Mode is to be used. You can use a standard credit cards without the black stripe but you would need to bound it manually after detection is shown.
Zoom View feature allows you to align the pointers on the screen very accurately. The option to save or share the results is also available in the app.
Another distinctive feature is the possibility to use front camera for measurements with timing option. So you can measure PD yourself.
- automatic detection
- Face Mode and Credit Card Mode
- option to switch between Back and Front Camera
- two different measurement units: mm and inches
- ability to adjust alignment manually
- Zoom View for accurate alignment
- auxiliary lines and points for segment height (bifocal), monocular (center to bridge) and frame measurements
monocular measurements (O.D and O.S.)
If you like the app and find it useful please support us with your feedback and comment.
Feel free to contact email@example.com with any questions or comments.
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Dim the ambient lights until the strobe is the dominant light source. Shine the light at the item spinning / vibrating and adjust the frequency until the item appears to be still. The frequency of the light is the same as that of the object and you can read off the frequency (HZ) or speed (RPM). Start high and work your way down.
If your light frequency is 1/2 or 1/3 or 1/4 x or any exact proportion of the shaft speed, the shaft will also appear stationary. This is called a harmonic. To ensure you don’t have a harmonic, double the frequency and check again. The highest frequency with effectively 'stops' the motion of the shaft is the true frequency.
Flashing lights occasionally cause epilepsy or other troubles in some people. If you feel unwell using this app then stop. This app is a tool, not a toy, please be careful.
Here is a good video about how to use this tool: http://www.youtube.com/watch?v=MqLwgisyjjw
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