Role of Anterior Segment Optical Coherence Tomography in Infectious Keratitis

50 patients with proven infectious keratitis clinically will be included in the study. The following will be performed for all patients in initial visit and follow up: * Slit lamp examination and photography. * Visual acuity assessment. * Anterior segment optical coherence tomography. 1. The central corneal thickness (CCT) (extracted from pachymetry map), 2. Minimal corneal thickness (MCT) (extracted from pachymetry map) 3. Corneal thickness at the site of the lesion (CTL) (extracted from pachymetry map or the sum of STL+ CETL) 4. Stromal thickness at the center of the lesion (STL) stromal lesion (extracted from stromal map) 5. Corneal epithelial thickness over the stromal lesion (CETL) at the center of the lesion (extracted from epithelial map)