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Br J Ophthalmol 89:1655-1659 doi:10.1136/bjo.2005.073916
  • Perspective

Impression cytology of the ocular surface

Table 1

 Nelson’s classification for squamous metaplasia

Grade Features
Grade 2 or more  =  abnormal.
0 >500 goblet cells/mm2
Small, round epithelial cells with large nuclei
1–2 100–500 goblet cells/mm2
3 <100 goblet cells/mm2
Large, polygonal epithelial cells with small nuclei

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