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The lowest observed adverse effect level (LOAEL) and no observed adverse effect level (NOAEL) for corneal damage according to the mire ring evaluation and fluorescein staining score. The red line and dot show LOAEL, the blue line and dot show NOAEL, and the yellow line shows the threshold limit value (TLV®) published by American Conference of Governmental Industrial Hygienists (ACGIH) in 2020.
