WHO Simplified Trachoma Grading (2020 Amended)
Grades one eye by the WHO simplified trachoma system as amended in 2020: TT (upper lid only), CO, TF (five or more follicles), TI and TS, each present or absent.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- An upper-lid eyelash touches the eyeball
- No
- Corneal opacity blurring at least part of the pupil margin
- No
- Follicles of 0.5 mm or more in the central upper tarsal conjunctiva
- 6
- Inflammatory thickening obscuring more than half the deep tarsal vessels
- No
- Easily visible scarring of the upper tarsal conjunctiva
- No
Result: Signs present in this eye: TF (trachomatous inflammation-follicular).
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What you enter
- An upper-lid eyelash touches the eyeball, or recent epilation of in-turned upper-lid lashes
- Corneal opacity blurring at least part of the pupil margin
- Follicles of 0.5 mm or more in the central upper tarsal conjunctiva (count)
- Inflammatory thickening obscuring more than half the deep tarsal vessels
- Easily visible scarring of the upper tarsal conjunctiva
How this is calculated
Citation
Solomon AW, Kello AB, Bangert M, et al. The simplified trachoma grading system, amended. Bull World Health Organ. 2020;98(10):698-705. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.