Combination therapy with diquafosol tetrasodium and sodium hyaluronate in patients with dry eye after laser in situ keratomileusis

INTERVENTION: Sodium hyaluronate ophthalmic solution Diquafosol sodium ophthalmic solution Combination of sodium hyaluronate ophthalmic solution and diquafosol sodium ophthalmic solution CONDITION: Dry eye PRIMARY OUTCOME: Dry eye symptoms; Uncorrected visual acuity; Corrected visual acuity; Functional visual acuity; Manifest refraction SECONDARY OUTCOME: Tear film breakup time; Fluorescein corneal staining; Schirmer test; Corneal sensitivity INCLUSION CRITERIA: 1) 20 years old or older. 2) female or male. 3) Patients who will undergo LASIK at Minamiaoyama Eye Clinic.