Correlation Between Preoperative Refraction and Anterior Segment Parameters With ICL Vault

This prospective non-comparative interventional study aims to analyse the pre-operative factors affecting the range of optimal ICL vaulting. the main question is what is the correlation between age, gender, spherical equivalent, white to white, anterior chamber volume and depth and postoperative vault? participants will do preoperative investigations ( specular microscopy, pentacam and biometry ) then refractive surgery (ICL implantation) followed by follow-up visits to assess the post-operative ICL vault and visual outcome.

Inclusion Criteria:Age:21 - 45 years old.High Myopia or Myopic astigmatism.Patients with stable preoperative refraction for the previous 12 months.Aqueous depth (ACD internal) = 2.8 mm or greater from the endothelial side using pentacam.Patients who are not fit for LASIK.No previous intraocular surgeries.Exclusion Criteria:Patients with endothelial cell count < 2800 cells /mm2Patients with corneal opacitiesPatients with preoperative glaucoma, cataract, and retinal disease.Patients with any systemic diseases especially collagen diseases.