"Wool over eyes": Holmgren's Skeins and Thomson's Stick.
Keeler
Richard
R
Museum of the Royal College of Ophthalmologists, London, UK.
Singh
Arun D
AD
Dua
Harminder S
HS
D003119:Color Perception Tests / Q000266:history* / Q000379:methods; D003117:Color Vision Defects / Q000175:diagnosis / Q000266:history*; D049672:History, 19th Century; D009885:Ophthalmology / Q000266:history*