While I'm on the theme of All Saints North Street, here is a fragment of glass from another window in the church. It is a detail of the mid fifteenth century window portraying the Nine Orders of Angels. In this window each of the orders of angels is shown with a group of equivalent mortals. The higher angels are shown with popes and emperors, while the three lowest orders are shown with a group of ordinary York folk. Among them is this wonderful chap holding a pair of spectacles up to his eyes.
A fascinating detail. I can't claim to be any sort of expert on late medieval optometry, but I did track down the following link, which describes the archaeological discovery of a similar set of specs at Trig Lane in London. The London specs are fifteenth century like the glass panel at North Street. They are bone rimmed, and just like the pair portrayed in the North Street panel the lenses were hinged so they could be moved together. Perhaps this was to give greater magnification. Anyway I should stop before I reveal my thorough ignorance of all things scientific. I have to say the Trig Lane specs are really rather elegant, I particularly like the pierced decoration.