Show Optical Advance During the century Improved methods method were Introduced for grind grind- In ing grinding a number or of spectacle lenses simultaneously Astigmatism wa was I studied and special len lenses es were era era- created sled to correct this common visual shortcoming The curves curve of lenses were refined and improved so 10 as al alto asto to permit more accurate of lenses lensel to indivIdual needs Th The possible curve combinations In lenses run into the millions AlIo Also a treat great improvement was by widening the tte angle of vision through lens lenses e so 10 that a person tan can ace ee out of the comer of his I elas glasses |