To evaluate the impact of refractive errors on the central corneal thickness obtained by Pentacam and intraocular lenses (IOL) master in eyes with different refractive errors.

Central corneal thickness (CCT) is a key indicator of corneal health status and helps to assess corneal diseases. The normal corneal thickness is about 540 μm and mainly consists of the stroma, which is estimated at 450 μm in the center. The stroma provides vital structural integrity and plays a key role in helping maintain transparency. It has been reported, however, that CCT follows a diurnal pattern being 10 μm thicker in the morning due to reduced evaporation of water from underneath the closed eyelids

Inclusion Criteria:

• Subjects included in this study aged between20 and 41 years, asked for refractive surgery

Exclusion Criteria:

• patients with corneal scarrig or opacification.

  • Patients with corneal dystrophies.
  • Patients with keratoconus.
  • Previous ocular or refractive surgery.
  • Ocular trauma.
  • Uveitis patients.
  • Patients with history of recent contact lens wear.

1. Inclusion criteria:

   Subjects included in this study aged between20 and 41 asked for refractive surgery

2. Exclusion criteria:-

   • Severe corneal scarrig or opacification., dystrophy
   • Patients with history of recent contact lens Ocular trauma.
   • Uveitis patients Patients with keratoconus.
   • Previous ocular or refractive surgey