I tested this, and IPCs should go blind upon losing their head

I think the cause of this bug was organs not being removed on decap, which
has since been fixed

code/modules/surgery/organs/subtypes/diona.dm

@@ -195,14 +195,6 @@
 	slot = "eyes"
 
 
-/obj/item/organ/internal/diona_receptor/remove(var/mob/living/user,special = 0)
-	if(!special)
-		owner.disabilities |= NEARSIGHTED
-		owner.sdisabilities |= BLIND
-		owner.eye_blind = 20
-		owner.eye_blurry = 40
-	..()
-
 /obj/item/organ/internal/diona_receptor/surgeryize()
 	if(!owner)
 		return

code/modules/surgery/organs/subtypes/machine.dm

@@ -132,13 +132,9 @@
 
 /obj/item/organ/internal/optical_sensor/remove(var/mob/living/user,special = 0)
 	if(!special)
-		owner.disabilities |= NEARSIGHTED
-		owner.sdisabilities |= BLIND
-		owner.eye_blind = 20
-		owner.eye_blurry = 40
 		owner << "Error 404:Optical Sensors not found."
 
-	..()
+	. = ..()
 
 /obj/item/organ/internal/optical_sensor/surgeryize()
 	if(!owner)