OSLA

Ocular Surface Lesion Area

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

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.

Ratings & Reviews

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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.

Version 2026.9.12

The developer, Chun-Huei Liu, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Chun-Huei Liu
    Size
    19.5 MB
    Category
    Medical
    Compatibility
    Requires iOS 15.0 or later.
    • iPhone
      Requires iOS 15.0 or later.
    • iPod touch
      Requires iOS 15.0 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    16+
    Copyright
    © 2026 Chun-Huei Liu
  • Developer Website
  • Privacy Policy

    • More by Chun-Huei Liu

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