Of the default of sight. Chap. 19.
DEfault of sight in the eien falleth & commeth of many manner causes: Sometime of euill complection• somtime of corruption of fumosity ye cōmeth out of ye stomacke, sometime of stopping of ye sinew yt is called Neruus opticus ye he∣low sinewe, and of straight wayes of webs, of moles, of the crampe, & of other such• Somtime of mordinate diet, of lōg sicknesse, of fasting, of seruice of Venus, & of many other causes, as of age, & such other. Then the causes shall be distin∣gued & known by their own signes & to∣kens. For it the default commeth of fu∣mositie of the stomack, ye default of sight it not continuall, but it commeth & go∣eth. For it waxeth and waneth by diuer∣sitie of meat & drinke. If it come of de∣fault of the braine, the default is conti∣nuall before meate and after. If it come of stopping of the sinew, the substaunce of the eie is pure, bright, & cléere. Other signes & tokens be knowne openly. Thē to put of this default, if it commeth of euill humours of ye stomacke, ye stomack shall be cleansed & purged, & al the body, and namely the head: And then men shal lay too remedies, as the place asketh: he which remedies be found in Vatico, and in other authours.