(Jon of the Clue Crew shows an anatomical diagram on the monitor.)  When Lasik eye surgery is performed, a flap is made in the eye, folded back, & then the stroma, or middle section, of this eye part is reshaped using lasers
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...... surgery treatment eye is made idle to create a corneal flap together with the... [DOC] [TLE] Download icao_medical.pdf - Civil Aviation Safety Authority [PAR] Class 1 Medical Assessment with an operational multi-crew limitation (OML) 
thereon.