# PD+ : Easy Pupillary Distance — Measure PD & Seg Height

> Measures pupillary distance, fitting height, and performs optical calculations. (iPhone/iPad app by Zernike LLC.)

- Source: https://appshunter.io/ios/app/pd-plus-easy-pupillary-distance/id1560353383 (this page in markdown: same URL + `.md`)
- Developer: [Zernike LLC](https://appshunter.io/developer/1636196510)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Rating: 4.70/5 from 509 App Store ratings · 23 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 76 MB
- Languages: American English
- Released: 2022-08-23
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/pd-plus-easy-pupillary-distance/id1560353383/reviews.md

## What is PD+?

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.

FITTING HEIGHT
PD+ instantly measures Fitting Heights for the frames you currently have on. Accurate fitting 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. In addition, Fitting Heights are used to position segments for fitting multifocal lenses. Please note: Fitting 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

## Key features

- Pupillary distance measurement
- Fitting height measurement
- Binocular and monocular PD
- Rx transposition calculator
- Vertex adjustment calculator
- Crossed cylinders calculator
- Minimum blank size calculator

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Subscription | $7.99 | one-time |


## What do users think of PD+?

Overall sentiment: mixed

**Pros**

- 👍 Easy and quick measurement
- 💡 Clever and innovative app
- ⭐ Highly accurate measurements
- 👍 Friendly and easy to use
- 🗣️ Voice instructions included
- ✅ Reliable PD and seg height measurements

**Cons**

- 📉 Unstable measurements
- ❓ Measurement inconsistency
- ❌ Inaccurate PD readings
- 🤔 Measurements not trustworthy
- 📏 PD off by several mm
- 🤷‍♀️ Incorrect frame size recommendations
- 😵‍💫 No two consecutive measures the same
- 📱 Not working on iPad
- 💥 App keeps crashing

**Commonly reported bugs**

- Face size unstable
- Camera distance sensitive
- App keeps crashing
- PD feature doesn't work on iPad
- Page stays black on iPad

**Most requested features**

- Can this app measure the PD for progressive lenses for right and left eyes?

## Recent user reviews (10 of 23)

All indexed reviews: https://appshunter.io/ios/app/pd-plus-easy-pupillary-distance/id1560353383/reviews.md

### 5/5 — Great app

*2026-07-18, version 1.7.7*

Good great grand wonderful

### 3/5 — Unstable measure

*2026-06-14, version 1.7.7*

Face size went small, large, small again and seems to be very camera distance sensitive. This instability casts doubt on the overall measurement ability

### 5/5 — PD

*2026-06-09, version 1.7.7*

Easy and quick way for measuring. Really good

### 5/5 — Mr C

*2026-05-26, version 1.7.7*

Best PD app yet, very clever.

### 1/5 — Wrong measurement!

*2026-05-10, version 1.7.7*

I remember at shop they measured 62 for my pd and the app is showing 56? lol pd don’t change over a year so user beware. Download more apps to get a consistent trend.

### 5/5 — Excellent App

*2026-05-08, version 1.7.7*

I love the actual preciseness of the app.

### 5/5 — Most Accurate by testing

*2026-04-25, version 1.7.7*

This app gave me the most accurate results by far, all the other apps rely on lidar depth sensors and some AI guesstimates to give you a generic result which is way off, but this one lets you face in a green zone to accurately determine the PD. I still say the credit card and photoshop method works the best if you want accuracy.

### 1/5 — Measurements way off

*2026-04-17, version 1.7.7*

My PD is 67 and this gave me 56 after measuring 3 times. It also recommended extra small frame when I always need extra large frames

### 1/5 — Which measurement to trust

*2026-04-10, version 1.7.7*

Measured 4 times, get 4 different results…it’s a NO GO for me, cannot trust it.

### 1/5 — pd is so far off

*2026-02-13, version 1.7.6*

not even close 20% off from several others, i have a giant wide face and it says small frames bahahah

## Frequently asked questions about PD+

### What does this app do?

This app measures your pupillary distance (PD) and fitting heights for eyeglass frames using your device's camera. It also includes several useful optical calculators for lens adjustments and visual acuity estimations.

### How accurate are the PD measurements?

Measurement accuracy is guaranteed to be the highest achievable by the capability of your device's camera system. Both far and near PDs, binocular and monocular, are available at no cost.

### What is fitting height and how is it measured?

Fitting height is measured for the frames you currently have on. Accurate fitting height measurements are needed to ensure lenses are properly centered for optimal viewing clarity and to position segments for multifocal lenses. This feature is supported on devices with TrueDepth or LIDAR camera systems.

### What optical calculators are included?

The app includes calculators for Rx Transposition, Vertex Adjustment, Crossed Cylinders (over-refraction), Keratometry Conversion, Visual Acuity Scale, Estimated visual acuity, Minimum Blank Size (MBS), and Magnifications.

### Is this app free to use?

The core features, including pupillary distance measurements and several optical calculators, are available at no cost. However, some advanced features or functionalities may be available through in-app purchases.

## Version history (last 5 releases)

### 1.8.0 — 2026-07-28

Measure your pupillary distance instantly with our App Clip—no full app download required. Launch it from a supported link or QR code.

### 1.7.7 — 2026-03-04

- Improved fitting height ML model with expanded and higher res dataset.
- Under-the-hood improvements

### 1.7.6 — 2025-12-22

Measure PDs and Fitting Heights from a photo loaded from your library (pro version only, A & DBL values required)

Under-the-hood optimizations

### 1.7.5 — 2025-08-08

Bug fix - segment position selection for pro users
Misc. under-the-hood improvements

### 1.7.4 — 2025-03-05

- Bug fix - functional restore purchases screen
- Simple onboarding

## Apps similar to PD+

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Pupil Distance Meter - Eye PD](https://appshunter.io/ios/app/pupil-distance-meter-eye-pd/id1638731689) | 4.6 (585) | Free | Health & Fitness |
| [EyeMeasure](https://appshunter.io/ios/app/eyemeasure/id1417435049) | 4.8 (22,225) | Free | Health & Fitness |
| [Pupil Distance PD Measure](https://appshunter.io/ios/app/pupil-distance-pd-measure/id1041586910) | 4.6 (2,733) | $7.99 | Health & Fitness |
| [Pupillary Distance measure PD](https://appshunter.io/ios/app/pupillary-distance-measure-pd/id6473115256) | 4.6 (21) | Free | Health & Fitness |
| [PDCheck AR](https://appshunter.io/ios/app/pdcheck-ar/id1563806777) | 4.9 (3,803) | Free | Health & Fitness |
| [Opthy](https://appshunter.io/ios/app/opthy/id1624663408) | 4.5 (2,938) | Free | Health & Fitness |

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*