# iTorsion

> Smartphone app for precise ocular torsion diagnosis using red-green glasses. (iPhone/iPad app by Regents of the University of Minnesota.)

- Source: https://appshunter.io/ios/app/itorsion/id1358552637 (this page in markdown: same URL + `.md`)
- Developer: [Regents of the University of Minnesota](https://appshunter.io/developer/455216626)
- Category: Medical
- Price: Free
- Rating: 5.00/5 from 6 App Store ratings · 1 written reviews indexed
- Age rating: 17+
- Requires: iOS 10.3 · 17 MB
- Languages: American English
- Released: 2018-03-29
- Data updated: 2026-06-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/itorsion/id1358552637/reviews.md

## What is iTorsion?

iTorsion seeks to make the diagnosis of ocular torsion a simpler and easier process for both doctors and their patients. While traditional diagnostic methods require using special equipment (e.g., Double Maddox Rod) that often lacks precision, iTorsion only requires a smartphone and red/green glasses leading to much greater precision.

This application is intended for use by doctors, and not for self-diagnosis by patients. Usage of the application will require standard red-green glasses to filter out colors from each eye. The specific color values can be tailored in the app to fit the specific requirements for the display and the glasses. The smartphone should be held on a level surface as the patient interacts with it. The patient should see predominantly one of the lines out of each eye, and will be asked to make the lines parallel with each other, as well as to the ground. After finishing the test, a screen will indicate the degree of extorsion and intorsion for each of the patient’s eyes.

## Key features

- Ocular torsion diagnosis
- Smartphone-based testing
- Red/green glasses compatibility
- Precise measurement
- Extorsion and intorsion calculation
- Customizable color values

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/itorsion/id1358552637/reviews.md

### 5/5 — Kim Merrill

*2019-12-10*

This torsion app is easy to use and simple for patients to understand. It accurately gives you degrees in Single digits.

## Frequently asked questions about iTorsion

### What is iTorsion used for?

iTorsion is a medical application designed to simplify and improve the precision of diagnosing ocular torsion. It allows doctors to measure extorsion and intorsion for each patient's eye.

### How does iTorsion work?

The app requires a smartphone and standard red-green glasses. Patients interact with the smartphone while wearing the glasses, aligning lines to determine the degree of ocular torsion.

### Is iTorsion suitable for self-diagnosis?

No, iTorsion is intended for use by medical professionals only and is not designed for self-diagnosis by patients.

### What devices support iTorsion?

iTorsion is available for iPhone, iPad, and iPod devices.

### What is the age rating for iTorsion?

iTorsion has an age rating of 17+, indicating it is intended for mature users and healthcare professionals.

### How often is iTorsion updated?

The latest version of iTorsion is 1.01, which was last updated on July 2, 2018. The app was initially released on March 29, 2018.

### Does iTorsion have ads?

No, iTorsion does not contain advertisements.

### What are the benefits of using iTorsion over traditional methods?

iTorsion offers greater precision compared to traditional diagnostic methods that often require specialized and less precise equipment like the Double Maddox Rod.

## Version history (last 2 releases)

### 1.01 — 2018-07-02

This app has been updated by Apple to display the Apple Watch app icon.

Added U of M logo to start page.

### 1.0 — 2018-03-29

No release notes.

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All apps by Regents of the University of Minnesota: https://appshunter.io/developer/455216626

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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 2026-06-03.*