Manufacture and material
Silicate glass is the best material for manufacturing glass ocular prosthetics. According to tradition, these are mainly produced in a glassworks in Lauscha in the Thuringia Forest. An indispensable characteristic of this glass is its high suppleness and malleability. Adding cryolite (wikipedia.org/wiki/Kryolith) improves these indispensable characteristics and allows rapid processing in the lower temperature region of around 600 degrees.
The desired resilience is achieved using a fire glaze, hence protecting the artificial eye from external influences such as human tears. The resultant material originating from Germany is biocompatible and has been tried and tested for over 150 years. Allergic reactions, often caused by synthetic materials, are unknown with glass. These factors are, amongst other things, important reasons why social security agencies have chosen glass as the standard care for their members.