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Table 1 The disease stages [8]

From: Acanthamoeba keratitis related to contact lens use in a tertiary hospital in China

Stage Manifestation
Early stage Pseudodendritic or punctate corneal epithelial lesions, dot infiltrations under the epithelium, recurrent epithelial erosion, radial corneal neuritis, corneal ulcer smaller than 4 mm in diameter in the anterior stroma
Advanced stage Deep stromal ulcer greater than 5 mm and less than 8 mm in diameter
Late stage The deep stromal ulcer greater than 8 mm in diameter and hypopyon, central corneal thinning and perforation