# PD Measure: Pupillary Distance

> Monocular PD for Glasses

Canonical page: [https://chrome-stats.com/d/id6797701761](https://chrome-stats.com/d/id6797701761)

## Overview

- **ID:** `id6797701761`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** MobiusRing
- **Category:** Health & Fitness
- **Version:** 1.0.1
- **Last updated:** 2026-08-31
- **First published:** 2026-08-12
- **Size:** 20 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/pd-measure-pupillary-distance/id6797701761)
- **Website:** [https://www.mobiusring.cn/](https://www.mobiusring.cn/)
- **Privacy policy:** [https://pupil.mobiusring.cn/privacy.html](https://pupil.mobiusring.cn/privacy.html)

## Description

Measure total and monocular PD on a compatible iPhone with 3D face tracking. Keep your eyewear reference data privately on your device.

Need your pupillary distance before ordering glasses?

PD Measure uses the front camera and 3D face tracking on compatible iPhone models to help you estimate total pupillary distance (PD) and left and right monocular PD. Follow the on-screen guidance to view your results and measurement quality in about 30 seconds.

Key Features

• Total PD: View the reference distance between both pupils
• Monocular PD: View left and right eye measurements separately
• 3D face tracking: Detect face position and eye alignment in real time
• Live guidance: Adjust distance and posture using on-screen feedback
• Measurement quality: Check whether the result is stable
• Local history: Save and compare measurement results on your device

Subscription

The app includes 10 free measurements. PD Pro unlocks unlimited measurements, complete history records, and future Pro features.

Payment is charged to your Apple Account when you confirm the purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours before the end of the current period. You can manage or cancel your subscription in Settings → Apple Account → Subscriptions on your iPhone.

Privacy Policy:
https://pupil.mobiusring.cn/legal.html?lang=en#privacy

Terms of Use and Subscription Terms:
https://pupil.mobiusring.cn/legal.html?lang=en#terms

Privacy
https://pupil.mobiusring.cn/legal.html?lang=zh-Hans#terms

Terms of Use (EULA)：
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Camera frames and face-tracking data are processed on device in real time. They are not saved as photos or videos, uploaded to a server, or shared with third parties. Measurement results are stored only on your device and can be deleted at any time.

Important Notice

Results are for eyewear-fitting reference only and are not an optometric prescription, medical diagnosis, or treatment advice. For prescription eyewear, children’s eyewear, progressive lenses, or vision concerns, please consult a qualified optician or eye-care professional.

## Rankings

- #1,720,590 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6797701761)