Femtosecond Small Incision Lenticular Extraction in Comparison to Femtosecond Laser Insitu Keratomileusis Regarding Dry Eye Disease

Femtosecond Small Incision Lenticular Extraction in Comparison to Femtosecond Laser Insitu Keratomileusis Regarding Dry Eye Disease

Comparison of femtosecond small incision lenticule extraction (FS-SMILE) versus Femtosecond laser Insitu Keratomileusis (FS-LASIK) regarding dry eye disease (DED) and corneal sensitivity (CS) after those refractive surgeries.

Inclusion Criteria:

• bilateral eyes with spherical correction range from -2 to -6 diopters and cylinder range from 0 to - 3.5 diopters

Exclusion Criteria:

• sign or symptom of dry eye disease (tear film breakup time (TBUT) >10 seconds
• Schirmer I test >10 mm /5 minutes)
• corneal or conjunctival staining
• Meibomian gland dysfunction
• Previous ocular and or eyelid medical or surgical treatment
• pregnancy
• Chronic systemic disorder