Vacuum blocking piece and method for manufacturing a spectacle lens

A vacuum blocking piece for vacuum blocking a lens blank, the vacuum blocking piece comprising:

• a support element having an upper part and a lower part, wherein the lower part is configured to engage with a clamping device in at least one of a form-fitting manner and a force-fitting manner for clamping the vacuum blocking piece to a grinding machine to fix the lens blank in a defined position with respect to the grinding machine and in a mechanically resilient manner sustaining a milling or grinding process for individualizing a refractive power of the lens blank;
• and
• a fluid-permeable blank contacting element, wherein the fluid-permeable blank contacting element is fluid-permeable and at least an upper surface of the fluid-permeable blank contacting element, which is configured to contact the lens blank, is made of an elastic material,
• wherein the vacuum blocking piece is configured to fix the lens blank to the upper surface of the fluid-permeable blank contacting element by applying a vacuum within the vacuum blocking piece to provide a suction through essentially an entire upper surface of the fluid-permeable blank contacting element to suck the lens blank to the upper surface of the fluid-permeable blank contacting element and to suck the fluid-permeable blank contacting element to the upper part of the support element,
• wherein the vacuum blocking piece contains a sealing lip arranged at a periphery of the fluid-permeable blank contacting element, wherein the sealing lip is configured to assist with providing a vacuum within the vacuum blocking piece and between the lens blank and the upper surface of the fluid-permeable blank contacting element,
• wherein the sealing lip and the fluid-permeable blank contacting element are formed as a single piece, and
• wherein the single piece is a monolithic piece.