# OSLA — Ocular Surface Lesion Area

> Ocular Surface Lesion Area (iPhone/iPad app by Chun-Huei Liu.)

- Source: https://appshunter.io/ios/app/osla/id6777434206 (this page in markdown: same URL + `.md`)
- Developer: [Chun-Huei Liu](https://appshunter.io/developer/1657411874)
- Category: Medical, Utilities
- Price: Free
- Age rating: 17+
- Requires: iOS 15.0 · 19 MB
- Languages: American English
- Released: 2026-09-10
- Data updated: 2026-09-17
- User reviews in markdown: https://appshunter.io/ios/app/osla/id6777434206/reviews.md

## What is OSLA?

OSLA measures the surface area of ocular surface lesions from a photo. Capture a close-up of the eye, mark the iris as an 11.5 mm reference, trace the lesion, and OSLA reports the area in square millimetres.

Built for eye care clinicians and researchers who need a consistent, repeatable way to document lesion size in clinic or in the field.

How it works:
- Capture with the guided camera (near focus lock, flash at capture) or pick an existing photo
- Draw around the iris. Its 11.5 mm average diameter sets the real-world scale
- Trace the lesion freehand, or tap point by point
- Read the area in square millimetres, with maximum and minimum dimensions

The saved photo includes the annotations and a small measurement card, so the result can go straight into your records.

Everything runs on the device. No account, no upload, no tracking. Photos stay on your phone unless you choose to share them.

OSLA is useful for documenting and monitoring conditions such as ocular surface squamous neoplasia, pterygium and conjunctival naevi. It is a documentation aid for clinicians, not a diagnostic device, and it does not replace clinical judgement.


## Version history (last 2 releases)

### 2026.9.12 — 2026-09-12

Fixes a problem that stopped the camera from opening, even when camera access had already been allowed. Tapping Capture Image now takes you straight to the camera.

Also fixes the labels at the bottom of the home screen being cut off when the text size is turned up.

### 2026.9.5 — 2026-09-10

No release notes.

## More apps by Chun-Huei Liu

- [GLAUC-STRAT Calc](https://appshunter.io/ios/app/glauc-strat-calc/id6444860662)
- [Cataract Lens](https://appshunter.io/ios/app/cataract-lens/id6447101876)
- [Iris Vision](https://appshunter.io/ios/app/iris-vision/id6499025034)
- [Gym Buddy: Rhino](https://appshunter.io/ios/app/gym-buddy-rhino/id6742897962)
- [constant.](https://appshunter.io/ios/app/constant/id6748115880)

All apps by Chun-Huei Liu: https://appshunter.io/developer/1657411874

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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 2026-09-17.*