 CMT and CTs were measured by using OCT The Spectralis OCT2 Module, Heidelberg Engineering, Baden-Württemberg, Germany. Enhanced depth imaging-OCT EDI-OCT mode of same device was used to measure CTs. CTs were recorded as subfoveal CT SCT, nasal CT NCT and temporal CT TCT represent under the fovea, 3 mm nasal to the fovea and 3 mm temporal to the fovea respectively. MPOD measurements were subsequently made by using luminance differential thresholds test Color perimetry technique MonPack System, Metrovision, Perenchies, France. 