Abstract: Visual aid especially for weak-sighted persons and comprising a sleeve into which at least one lens is fittable having the desired optical properties. The sleeve is intended to be fitted into an opening in a spectacle glass and be fixed in an optional position for individual adjustment of the distance between the person's cornea and the lens surface.
Abstract: There is described a method for manufacturing a spectacle lens for myopes the edge thickness of which may be considered as substantial, which comprises starting with a semi-machined product with a concave hollowing which extends to the edge or substantially to the edge of the lens, milling away about 40 to 51% of the lens edge thickness, and radiusing convexly thereafter the sharp angle between said concave hollowing and the plane-milled portion of the lens which surrounds said concave hollowing.