I can see!

code/modules/clothing/glasses/glasses.dm

@@ -220,6 +220,7 @@
 	sprite_sheets = list(
 		"Vox" = 'icons/mob/species/vox/eyes.dmi'
 		)
+	prescription_upgradable = 1
 
 /obj/item/clothing/glasses/sunglasses
 	desc = "Strangely ancient technology used to help provide rudimentary eye cover. Enhanced shielding blocks many flashes."
@@ -424,6 +425,7 @@
 	desc = "Used for seeing walls, floors, and stuff through anything."
 	icon_state = "meson"
 	origin_tech = "magnets=3;syndicate=4"
+	prescription_upgradable = 1
 
 /obj/item/clothing/glasses/thermal/monocle
 	name = "Thermoncle"
@@ -499,4 +501,4 @@
 				desc = "Just who the hell do you think I am?!"
 				name = "gar glasses"
 				icon_state = "gar"
-				item_state = "gar"
+				item_state = "gar"