# PD+ : Easy Pupillary Distance

> Measure PD & Seg Height

Canonical page: [https://chrome-stats.com/d/id1560353383](https://chrome-stats.com/d/id1560353383)

## Overview

- **ID:** `id1560353383`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Zernike LLC
- **Category:** Health & Fitness
- **Rating:** 4.70 / 5 (528 ratings)
- **Version:** 1.8.0
- **Last updated:** 2026-07-28
- **First published:** 2022-08-23
- **Size:** 76 MB
- **Data as of:** 2026-09-24
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/pd-easy-pupillary-distance/id1560353383)
- **Privacy policy:** [https://www.zernikevision.com/privacy-policy/](https://www.zernikevision.com/privacy-policy/)

## Description

PD+ instantly measures pupillary distance (PD) from a high-resolution facial photo. It provides near and far PD in binocular and monocular modes, with no additional cost. For compatible devices, it also calculates fitting height for frames to ensure lenses are properly centered for optimal vision. Fitting Height is supported on devices with TrueDepth or LIDAR cameras. 

Calculators included in PD+ cover Rx Transposition, Vertex Adjustment, Crossed Cylinders (over-refraction), Keratometry Conversion, Visual Acuity Scale, Estimated Visual Acuity, Minimum Blank Size (MBS), and Simple Magnifier and Spectacle Magnifications, enabling a comprehensive eyewear fitting workflow.

## Rankings

- #71,069 — Overall

## Review summary

Users largely praise the app for ease of use, quick PD checks, and features like voice instructions and seg height measurements. A recurring theme is unreliable accuracy: many reviews report inconsistent results across attempts and significant deviation from optician measurements (off by 4–6 mm, 20% off). Several caution against using it for prescriptions, and a few report crashes or inaccurate frame-size guidance. Overall, it’s convenient but not dependable for professional eyewear prescriptions.

### Pros

- Accurate and precise PD measurements.
- User-friendly and easy to use interface.
- Convenient for pocket on-the-go PD checks.
- Voice-guided instructions for measuring.
- Includes seg height measurement.

### Cons

- PD results are often inaccurate and vary across attempts.
- Not reliable for prescription decisions; should be verified by an optician.
- Results frequently do not match optician’s measurements.
- App stability issues (crashes).
- Frame size recommendations can be inaccurate.

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1560353383)