PD+ : Easy Pupillary Distance 4+
Measure PD & Seg Height
Zernike LLC
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- Free
- Offers In-App Purchases
Screenshots
Description
PUPILLARY DISTANCE
PD+ instantly measures pupillary distance (PD) by capturing & processing a single, hi-res facial photo. Measurement accuracy is guaranteed to be the highest achievable by the capability of your device's camera system. Far and near PD's -- binocular & monocular -- are always available at no cost.
SEG HEIGHT
PD+ instantly measures Segment Height -- Seg Height -- for the frames you are currently wearing. Accurate seg height and PD measurements are needed to ensure that lenses being made for your frames are properly centered on your eyes to achieve optimal viewing clarity. Please note: Seg Height is currently only supported on devices equipped with the TrueDepth or LIDAR camera systems (e.g., iPhone X and later non-SE models).
CALCULATORS
- Rx Transposition
- Vertex Adjustment
- Crossed Cylinders (over-refraction)
- Keratometry Conversion
- Visual Acuity Scale
- Estimated visual acuity
- Minimum Blank Size (MBS)
- Simple Magnifier and Spectacle Magnifications
What’s New
Version 1.7.2
• PD measurement for supported liDAR back cameras (e.g., iPhone 12 Pro and newer; recent iPad Pros) - accurate PD measurements from up to 6 feet away.
• Custom Calibration - adjustable sensitivity value for personalized calibration addressing reported inaccuracies from certain older devices' TrueDepth cameras.
• Bug Fixes and Improvements
Ratings and Reviews
Works great
There were a couple others that I tried but this one worked great. It even has voice instructions. I would highly recommend this app
Developer Response ,
Thank you for your feedback! We are very glad that you have found PD+ to be useful.
Friendly use
friendly use and accurate.
PD not quite there
Using an iPhone SE. PD’s for myself and my coworkers were constantly off by 4-6 mm. Calculations are a great tool to have for the pocket access, but since most people will probably use this to measure their PD for online glasses prescriptions, I would not recommend this. Best to get it measured by a real optician.
Developer Response ,
We really appreciate your honest review. The iPhone models with a single-lens camera (includes SE and devices that came before iPhone X) pose a challenge due to the lack of depth imaging capability. However, we are always finding ways to squeeze out more performance in all devices running at least iOS 15. We hope you would consider updating your review in a future PD+ release.
App Privacy
The developer, Zernike LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Identifiers
- Usage Data
- Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Information
- Seller
- Zernike LLC
- Size
- 78.7 MB
- Category
- Health & Fitness
- Compatibility
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- iPhone
- Requires iOS 16.0 or later.
- iPad
- Requires iPadOS 16.0 or later.
- Languages
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English
- Age Rating
- 4+
- Copyright
- © Zernike LLC
- Price
- Free
- In-App Purchases
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- Lifetime Subscription $7.99
Supports
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Family Sharing
Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.