Available on the App Store

PD+ Eyewear Fitting System

Instantly measures PDs and Fitting Heights with a single facial photo. Fitting Heights are estimated relative to the frames worn in the photo.

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Face with PD measurement overlay
Distance PD
63.5 mm
Right: 31.93 mm   Left: 31.42 mm
Intermediate / Near PD
59.5 mm
Right: 30.06 mm   Left: 29.58 mm
High Accuracy
Camera-optimized
Single Photo
Quick capture

Measurement accuracy is guaranteed to be at the highest level that can be achieved by your device's camera system. Both far and near PD's — binocular & monocular — are available at no cost.

4
PD Measurements
1
Photo Required
4
Built-in Calculators
Free
PD Measurement
Capabilities

Everything You Need for
Accurate Optical Measurements

A comprehensive suite of measurement and calculation tools designed for optical professionals and eyewear consumers.

Measure PDs

Accurately measure both binocular and monocular PDs using a single hi-res facial photo. Intermediate/near PDs are also included for free.

Fitting Heights Measurement

Measures fitting height for your current frames using TrueDepth or LIDAR camera systems. Essential for progressive and bifocal lenses.

Single Photo Capture

No complicated setup or multiple photos required. Just capture one hi-res facial photo and get all your measurements instantly processed.

Camera-Optimized Accuracy

Measurement accuracy is guaranteed to be at the highest level achievable by your device's camera system. Precision you can rely on.

Built-in Calculators

Access a full suite of optical calculators including Rx Transposition, Vertex Conversion, Snellen Line, and Minimum Blank Size tools.

How It Works

Accurate Measurements in Three Simple Steps

From photo capture to precise measurements in seconds. No special equipment needed.

1

Position & Capture

Center your face on the screen and take a selfie. Make sure your face is well-lit for the best results.

2

Automatic Processing

The app instantly detects your facial features and calculates pupillary distance and fitting height using advanced image processing.

3

Review Results

View your far PD, near PD (binocular & monocular), and fitting height measurements. Use the built-in calculators for additional optical work.

Built-in Calculators

Professional Optical Tools
Right at Your Fingertips

Four essential calculators every optical professional and informed consumer needs, included at no extra cost.

Rx Transposition

Quickly convert prescriptions between plus and minus cylinder forms. Essential for lens ordering and verifying prescriptions across different notation styles.

Included Free

Vertex Conversion

Compensate for vertex distance changes when converting between spectacle and contact lens prescriptions. Accurate results for high-powered lenses.

Included Free

Snellen Line Conversion

Convert between Snellen visual acuity notation, LogMAR values, and decimal equivalents. Useful for clinical records and patient communication.

Included Free

Minimum Blank Size

Calculate the minimum lens blank size needed to cut a lens for a given frame. Ensures the right blank is selected to avoid ordering errors.

Included Free
Device Compatibility

Advanced Camera Systems for Maximum Precision

Fitting Height is currently only supported on devices equipped with the TrueDepth or LIDAR camera systems. PD measurement works on all iOS devices with a front-facing camera.

iPhone X and later (TrueDepth)
iPhone 12 Pro / 13 Pro and later (LIDAR)
iPad Pro with LIDAR scanner
PD measurement available on all iOS devices

TrueDepth Camera

Enables precise 3D facial mapping for accurate fitting height measurements.

LIDAR Scanner

Time-of-flight depth sensing for millimeter-level measurement precision.

Standard Camera

PD measurement available on any iOS device with a front-facing camera.

Get Started

Ready to Measure Your PD & Fitting Height?

Download Zernike Vision today and get instant, accurate pupillary distance and fitting height measurements from your iPhone or iPad.

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Available for iPhone and iPad · iOS 15.0 or later