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Comparison of vessel area density (VAD) in conjunctival vs. corneal components of OSSN (n = 11). The VAD in the conjunctival component was significantly higher than the corneal component of OSSN. Similarly, VAD in the sub-epithelial area under the conjunctival OSSN was significantly higher than under the corneal OSSN (P < 0.05). OSSN, ocular surface squamous neoplasia. Bar = standard error.
