McCallan's classification
McCallan in 1908 divided the clinical course of trachoma into four stages:
| Stage 1 (incipient trachoma) | Stage 2 (established trachoma) | Stage 3 (cicatrising trachoma) | Stage 4 (healed trachoma) |
|---|---|---|---|
| Hyperaemia of palpebral conjunctiva | Appearance of mature follicle & papillae | Scarring of palpebral conjunctiva | Disease is cured or is not markable |
| Immature follicle | Progressive corneal pannus | Scars are easily visible as white bands | Sequelae to cicatrisation cause symptoms |
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