{"tema_id":"105","string":"astigmatic power lens           #01135","created":"2022-12-19 09:13:28","code":null,"notes":[{"@type":"Scope note","@lang":"en-EN","@value":"One of these powers may be zero, with the corresponding focal line at infinity. Lenses referred to as toric lenses, sphero-cylindrical lenses and cylinder lenses are all astigmatic. "},{"@type":"Cataloger's note","@lang":"en-EN","@value":"reference: R093:1999 3.10 "},{"@type":"Cataloger's note","@lang":"en-EN","@value":"ID: 01135 "},{"@type":"Definition note","@lang":"en-EN","@value":"lens bringing a paraxial pencil of parallel rays to two separate line foci mutually at right angles and hence, unlike a spherical lens, having two principal powers "}]}