# OKN Strips — Optokinetic Nystagmus Testing

> Diagnostic and therapeutic app for optokinetic nystagmus and eye disorder testing. (iPhone/iPad app by Thomas Alvarez.)

- Source: https://appshunter.io/ios/app/okn-strips/id496001751 (this page in markdown: same URL + `.md`)
- Developer: [Thomas Alvarez](https://appshunter.io/developer/496001754)
- Category: Medical, Health & Fitness
- Price: $3.99
- Rating: 4.60/5 from 579 App Store ratings · 25 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 7 MB
- Languages: American English
- Released: 2012-02-19
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/okn-strips/id496001751/reviews.md

## What is OKN Strips?

Top selling diagnostic and therapeutic app for iPad, iPhone and iPod Touch!

OKN Strips can be used to elicit Optokinetic Nystagmus (OKN) for evaluation of neurological, otological or opthalmological disorders, includes a Red Desaturation mode and now has an Amsler grid for additional eye testing.

OKN Strips:
Tap the screen to cycle through speeds of the moving strips. Tap the strips icon in the bottom toolbar to toggle the color of the strips between Red and Black. Pinch or Zoom with two fingers to change the width of the strips. Swipe against the direction the strips are moving to reverse their direction. Tap the screen with two fingers to hide or show the bottom toolbar.

On the right side of the bottom toolbar there's icons to open the Red Desaturation and Amsler Grid.

Red Desaturation:
Use the colored circle to perform a red desaturation test.

Amsler Grid:
Use the Amsler grid to perform eye tests. The buttons on the bottom toolbar change color combinations of the grid.

## Key features

- Optokinetic Nystagmus (OKN) elicitation
- Red Desaturation test
- Amsler Grid for eye testing
- Adjustable strip speed, color, and width
- Reverse strip direction
- Toolbar hide/show functionality

## Chart rankings

- #117 in Top Paid · Medical (US App Store)

## What do users think of OKN Strips?

Overall sentiment: mixed

**Pros**

- 👍 Helpful for eye therapy
- 👍 Reduces eye strain and dizziness
- 👍 Effective for nerve/muscle paralysis
- 👍 Great for babies' OKN assessment
- 👍 Good for Amsler grid use
- 👍 Outstanding customer support
- 👍 Simple and perfect functionality
- 👍 Works quite well
- 👍 Fast response to issues
- 👍 Helps with cybersickness symptoms

**Cons**

- 😞 No way to adjust speed/style
- 😞 Cannot customize direction
- 😞 Lacks options for smooth pursuit/saccades
- 😞 Expensive for basic functionality
- 😞 Difficult to uninstall
- 😞 Color doesn't change in red desaturation test
- 😞 Red-Black inversion doesn't work
- 😞 No instructions provided
- 😞 Navigation between features is difficult
- 😞 Slower speed option needed

**Commonly reported bugs**

- Red desaturation test color doesn't change
- Red-Black inversion doesn't work on grid test
- Cannot go back to menu from OKN strips without restarting app

**Most requested features**

- Recording feature
- Adjustable speed and style
- Change direction of movement (left/right, up/down)
- Options for smooth pursuit, saccades, VOR
- Horizontal stripes option
- More peer-reviewed studies
- Make technology better known
- Slower speed option

## Recent user reviews (10 of 25)

All indexed reviews: https://appshunter.io/ios/app/okn-strips/id496001751/reviews.md

### 1/5 — Missed opportunity

*2025-10-29*

Should have a recording feature

### 5/5 — It’s good

*2025-04-18*

I like it!

### 1/5 — Cannot customise

*2025-04-15, version 2.1*

Thought this would be helpful but there is no way to adjust the speed and style. Very disappointing - use the free web version instead!

### 3/5 — Good, but needs some improvement

*2025-02-01*

My vision therapist recommended this app to help with eye stretches. It’s good, but I wish I could change the direction the bars move. I have to do this exercise with a patch on because my eyes don’t track together. So I’d like it if the bars could travel left or right and up or down.

**Developer response:** Hi JobbbieBo,

You can change the direction of the bars by swiping on the screen in the opposite direction against how they're moving.

Also if you lock screen rotation on your device, you can physically rotate your device to control how the bars are moving.

### 1/5 — No adjustments

*2024-07-10*

Would have been nice to choose some things like smooth pursuit, saccades, vor

### 5/5 — Before this app my professor and I thought I was a zombie.

*2023-07-30*

My brain seems to be looking at things better now and my eyes feel like the computer vision syndrone eye strain I suffered from decreased significantly. I feel more stable now that I don't feel so stressed and dizzy. It's pretty expensive for just playing a pattern. And you'd be outright crazy to not pay $3.99 to see these changes. Also, the eye strain of having hella bad tunnel vision caused by the iphone was causing my dry eye because it's reversed with this app. They should make this technology have more peer reviewed double blind studies and also make it more well known that cybersickness and feeling like the phone is making you sick doesn't mean you are crazy it may just mean you need these exercises the help with something not natural like looking at a smartphone. Even my family members said they felt better using the app a few times. I feel like the smartphone made me feel like a zombie before and just feel a lot less tense and more relaxed. Look up the National Geographic article on cybersickness and you will start to see what some people suffer from with these smartphones being so prevalent.

### 1/5 — Don’t want to keep paying for this and can’t figure out how to uninstall

*2022-07-30*

Dont want this app

**Developer response:** There is no recurring cost to the app. You paid a one time fee to purchase the app. If you’re not happy with the app, you can request a refund from Apple directly. Google “How to get a refund for iTunes or App Store purchases” and you’ll find directions for how to do this.

### 3/5 — Want horizontal stripes

*2021-12-26*

Mine will only display vertical stripes and I need horizontal as well as vertical for mdds symptoms. I am not sure if that is possible with this app. If so, I don’t know how to do it

**Developer response:** I believe you can achieve what you want using rotation lock on your iOS device. Rotate the device to the orientation you want and lock it and then the stripes will continue flowing the way you locked the orientation. You may not even need to use rotation lock and just physically rotate your device from portrait to landscape.

If you need more help, please contact me via email at oknstrips@thomasalvarez.com

Thanks!

### 5/5 — OKN strips

*2021-03-07*

This  works quite well. Tap the screen to make the strips go faster. Level 1 through 5. I’m using this app to treat my nerve/ muscle paralysis in my left eye.  It was recommended by my therapist.  This exercise and time and hope.

**Developer response:** The strips should cycle through speeds by tapping on the screen. If you're having problems with that, please contact oknstrips@thomasalvarez.com so we can work with you to try and solve the problem. Thanks.

### 2/5 — color doesnt change.

*2020-05-17*

color of the circle of the red desaturation test doesnt change.

## Frequently asked questions about OKN Strips

### What is OKN Strips used for?

OKN Strips is a diagnostic and therapeutic app designed to elicit Optokinetic Nystagmus (OKN). This is used for the evaluation of neurological, otological, or ophthalmological disorders. It also includes tools for red desaturation and Amsler grid eye tests.

### What are the key features of OKN Strips?

Key features include the ability to elicit OKN with adjustable moving strips (speed, color, width, direction), a red desaturation test, and an Amsler grid for comprehensive eye examinations. Users can also toggle the toolbar for a cleaner interface.

### How much does OKN Strips cost?

Based on the provided information, OKN Strips is a paid application. There are no mentions of in-app purchases or advertisements, indicating a one-time purchase model.

### What devices is OKN Strips compatible with?

OKN Strips is available for iPad, iPhone, and iPod Touch devices. It is described as a top-selling diagnostic and therapeutic app for these platforms.

### How can I use the Amsler Grid feature?

The Amsler grid feature is accessed via an icon on the bottom toolbar. You can use the grid to perform eye tests, and the buttons on the toolbar allow you to change the color combinations of the grid for different testing scenarios.

## Version history (last 5 releases)

### 2.1 — 2020-01-23

Dark Mode Support
iOS 13 Support and Fixes

### 2.0.2 — 2018-11-09

Fixed positioning of the speed label that shows up when you change the speed on some devices.

Fixed a layout bug when using OKN Strips in a Split View on iPad.

Updated for the new Late-2018 iPad Pros.

### 2.0.1 — 2017-11-03

Optimizations for iPhone X.

New Quick Actions available when you 3D Touch on the app icon.

### 2.0 — 2017-09-22

All new Version 2.0 rebuilt from the ground up in Apple's new programming language, Swift. Fully compatible with new versions of iOS.

New redesigned interface. You can swipe to change the strips' movement direction. You can tap with two fingers to hide and show the tab bar on the bottom of the screen.

### 1.3 — 2013-10-10

Update for iOS 7

Amsler Grid now supports Landscape orientation

## Apps similar to OKN Strips

| App | Rating | Price | Category |
| --- | --- | --- | --- |
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## Related topics

[optokinetic](https://appshunter.io/ios/topics/optokinetic) · [amslerpro](https://appshunter.io/ios/topics/amslerpro)

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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 2026-08-24.*