Dropdownlistfor not binding with string array in razor syntax in MVC5

Hi,

 

unable to bind dropdownlistfor with string array

 

Razor View Code :

 @Html.DropDownListFor(model => model.PatientPrescriptionViewData.Prescription[i].DropDownSelected,new SelectList(Model.PatientPrescriptionViewData.RightEye_HorizontalPrism_DropDown), Model.PatientPrescriptionViewData.Prescription[i].DropDownSelected)

 

String Array Model Value :

 

 

 

 

Thanks in advance, please help me out.