The surgical field ( visual analog scale -LSB- VAS -RSB- @ -LSB- range @-@ -RSB- compared with @ -LSB- range @-@ ; P < @ -RSB- ; @ = worst visual clarity , @ = best visual clarity ) and the effluent fluid ( VAS @ -LSB- range @-@ -RSB- compared with @ -LSB- range @-@ ; P < @ -RSB- ; @ = clear , @ = unclear ) were statistically significantly clearer in the vasopressin group .