Pugh Orthoptoscope by Hamblin.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Pugh Orthoptoscope by Hamblin. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Pugh Orthoptoscope by Hamblin. Wellcome Collection. Source: Wellcome Collection.