What is the process in the production of spectacles that starts with the correct refractive power lenses and ends with completed glasses?

The process that accurately describes the production of spectacles, starting with the correct refractive power lenses and ending with completed glasses, is best characterized by edge grinding.

Edge grinding is a critical step in the manufacturing of spectacles as it involves the precise shaping and finishing of the lens edges after they have been cut to the appropriate refractive power. During this stage, lenses are ground to fit perfectly into the selected frame, ensuring a snug and secure fit while providing optimal visual clarity for the wearer. This process ensures that the edges of the lenses are smooth and can seamlessly integrate with the frames, contributing to the overall aesthetics and comfort of the finished glasses.

Fining, while an important step in producing optical lenses, is primarily focused on refining the lens surface to eliminate imperfections, which occurs before the edges are shaped. Lens coating involves applying anti-reflective, scratch-resistant, or other specialized coatings to the lens surfaces, which typically happens after the lenses are ground. Assembling refers to the final step of putting the lenses into the frames along with various components, but it follows the edge grinding process rather than encompassing it. Therefore, edge grinding is the step that directly connects the lens preparation to the final product.