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welcome to just answer
usually the minimum endothelial cell count that is said to be required for the viability of the cornea is 700 cells/mm2
but this can vary from patient to patient
in presence of guttae in the endothelial surface, even 700 cells/mm square might not be sufficient
As you are doing you would need regular specular microscopy to see the endothelial cell count as well as the condition of the cornea before taking any decision for surgery
hope this information is helpful