IOL vs 9 Gaze
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IOL
This medical tool assists in calculating intraocular lens power for cataract surgery. It provides essential calculations for ophthalmologists and eye care professionals.
- Intraocular lens power calculation
- Cataract surgery assistance
- Medical calculation tool
- Ophthalmology aid
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An intraocular lens power calculator for cataract surgery.
9 Gaze
This app helps document eye motility and strabismus in nine cardinal positions. It offers an on-screen guide for consistent eye positioning and automatically creates composite images for easy exporting. Users can add strabismus measurements and email or save images for medical records.
- Document eye motility and strabismus
- On-screen guide for eye positioning
- Automatic composite image creation
- Add strabismus measurements
- Selfie or standard mode
- Email or save images
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9 Gaze is an easy, quick, and efficient way to document eye motility and strabismus in the nine cardinal positions of gaze (and 2 head tilts, abnormal head position). The app provides an on-screen guide for eye positioning to assist with image consistency through all photographs. 9Gaze app automatically creates a composite image of the photographs for easy exporting. Designed for a touch-screen interface, you can also quickly add strabismus measurements to your photograph or as a stand-alone image. You can email the images to yourself for importing into your record or save to your camera roll. Features: - Selfie mode or standard mode - On-screen guide for placement of eyes (with autocrop) - Automatic creation of the composite image of all 9(+2) positions of gaze - Ability to skip gaze directions (or skip to end) - Re-take any picture - Turn flash on or off - Landscape and portrait modes - Ability to document name, ID number, date of birth, and date of picture Save time with 9 Gaze! Disclaimer: No information or photos are ever saved within the app. It is the user's responsibility to protect any and all protected health information (PHI) obtained by the user. If you choose to save images to camera roll, it is highly suggested to encrypt your phone and turn off iCloud photo backup. When emailing photos, please make sure your email is HIPAA secure. This is not a medical device. Do not use app to diagnose or treat any medical conditions.
Screenshots
Verdict
The clearest difference is rating: 9 Gaze at 4.6 against IOL's 3.6. 9 Gaze also leads on review sentiment (86% vs 75%). IOL's advantage is update cadence (weekly vs every 2 months) and iOS requirement (11.2 vs 13.0). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
9 Gaze holds the better App Store score, 4.6 against 3.6. Both are backed by a comparable volume of ratings — 9 and 22 respectively. Written reviews point the same way: 75% of IOL's written reviews are positive against 86% of 9 Gaze's.
IOL ships an update weekly, 9 Gaze every 2 months. Both last shipped on November 6, 2026.
| Parameter | IOL | 9 Gaze |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (9 ratings) | 4.6 (22 ratings) — better |
| Positive reviews | 75.0% of reviews | 85.7% of reviews — better |
| Number of ratings | 9 | 22 — better |
| Update frequency | Weekly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.2 — better | 13.0 |
| Further details — not scored | ||
| Size | 1 MB | 36 MB |
| Age rating | 4+ | 12+ |
| Developer | Columbia University | See Vision, LLC |
Customer experience
IOL
9 Gaze
In-app purchases
IOL
No in-app purchases
9 Gaze
No in-app purchases








