Parks Three Step 4+

Todd Zarwell

Designed for iPad

    • 5.0 • 7 Ratings
    • Free



The Park's Three-Step Test is used to isolate the paretic muscle in acquired vertical diplopia.

Enter your observations for each of the three tests and the app will suggest which EOM is underacting.

However, I firmly believe you should never fully trust an app to make your clinical decisions! This app explains how the each test is used to determine the final result. Consequently, this application is not only clinically useful but also helps you understand which are the primary EOMs in different fields of gaze.

What’s New

Version 1.01

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

Just a couple small changes to make sure this app remains compatible with new versions of iOS.

Ratings and Reviews

5.0 out of 5
7 Ratings

7 Ratings

JohnMacU2 ,

Simple and functional - excellent

It's exactly what a clinical and educational tool should be: easy to use. More than worth the price.

charlesandtara ,


A simple and to the point app that can be used chair side with out any added time.

drfaguilera ,

Fernando Aguilera MD

Being a Strabismus Sub especialist for 30 years it is wonderful to see this app that takes the guess out of most vertical deviations, especially IV nerve palsy that are difficult to diagnose for the non Strabismus Surgeon
Congratulations !

App Privacy

The developer, Todd Zarwell, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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