Visual Vertical vs OKN Viewer

Visual Vertical makes high-grade subjective visual vertical (SVV) testing accessible to every practitioner — no expensive equipment required. SVV testing is a sensitive, validated measure for brainstem lesions and otolithic dysfunction, widely used in neurology and vestibular rehabilitation. Until now, accurate testing required bulky, costly apparatus. Visual Vertical changes that: all you need is your iPhone, a bucket, and a small piece of Blu Tack. How it works Mount your iPhone inside the bottom of a bucket using Blu Tack. The patient holds the bucket to their face and adjusts a line on screen until it appears vertical to them. The app records the deviation and calculates your result — accurate readings in minutes, at a fraction of the traditional cost. What you can measure - Left eye, right eye, or both eyes open - Single readings or full sequences across all conditions - One or three readings per condition, with automatic averaging Clean, minimal results screens make it easy to record and communicate findings.

Observe and record optokinetic nystagmus (OKN) on your iPhone or iPad. OKN Viewer is a simple educational app for displaying moving stripe stimuli and observing optokinetic nystagmus (OKN) and eye movements. Choose from four stimulus directions — up, down, left, and right. Adjust the speed, stripe width, and colors to suit your needs, and use the front-facing camera to record eye movements while viewing the OKN stimulus. Your latest recording can be reviewed immediately, while previous recordings remain available in the video library. KEY FEATURES ■ FOUR-DIRECTION OKN STIMULATION Choose from up, down, left, and right stimulus directions. ■ ADJUSTABLE STIMULUS SETTINGS Customize the stimulus to suit your needs: - Speed: Slow / Normal / Fast - Stripe width: Thin / Normal / Thick - Customizable stripe colors ■ RECORD EYE MOVEMENTS Use the front-facing camera to record eye movements while viewing the OKN stimulus. ■ QUICKLY REVIEW YOUR LATEST RECORDING After recording, you can immediately open and review your latest video. ■ RECORDING LIBRARY View and play your previous recordings in one place. ■ SAVE VIDEOS TO PHOTOS Select recordings and save them to your Photos library when needed. SIMPLE AND READY TO USE No complicated setup is required. Open OKN Viewer and start displaying an OKN stimulus immediately. Adjust the direction, speed, stripe width, and colors as needed, then observe or record eye movements. Your stimulus settings are saved and remain available the next time you open the app. WHO IT'S FOR OKN Viewer may be useful for: - Learning about optokinetic nystagmus (OKN) - Observing eye movements - Ophthalmology and neuro-ophthalmology education - Learning about nystagmus and balance-related eye movements - Medical students and healthcare professionals - Orthoptists and orthoptic students - Educational demonstrations and training involving eye movements PRIVACY FOCUSED - No advertisements - No behavioral analytics - Recorded videos are not automatically uploaded or transmitted OKN Viewer does not use behavioral analytics to track how you use the app. Recordings are stored within the app. They are not automatically sent to an external server. You can choose to save selected recordings to your Photos library. IMPORTANT NOTICE OKN Viewer is intended for educational, learning, and observational purposes. It is not intended to diagnose, treat, prevent, or make clinical decisions regarding any disease or medical condition. Do not use the app or its recordings as the sole basis for medical diagnosis or treatment decisions. Moving visual patterns may cause dizziness, nausea, visual discomfort, or other unpleasant symptoms in some users. Stop using the app immediately if you experience discomfort. If you are concerned about any medical symptoms, please consult an appropriate healthcare professional. FEEDBACK AND BUG REPORTS You can send feedback, feature requests, and bug reports from within the app. Your feedback helps us continue improving OKN Viewer.