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a Relationship between corneal vertex displacement and corneal flap thickness. Intraocular pressure ranged from 15 to 49 mmHg. b Relationship between the anterior corneal surface displacement along the Y-axis and corneal flap thickness. The corneal flap thickness was assumed to be 90, 120, 150, 180, 210, and 240 μm, respectively. The unit of corneal vertex displacement was μm
