{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T10:35:59Z","timestamp":1767177359941,"version":"build-2238731810"},"reference-count":6,"publisher":"Optica Publishing Group","issue":"11","license":[{"start":{"date-parts":[[2020,4,8]],"date-time":"2020-04-08T00:00:00Z","timestamp":1586304000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v1#VOR"},{"start":{"date-parts":[[2020,4,8]],"date-time":"2020-04-08T00:00:00Z","timestamp":1586304000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Appl. Opt."],"published-print":{"date-parts":[[2020,4,10]]},"abstract":"\n In their paper [\n \n Appl. Opt.<\/jats:source>\n 58<\/jats:volume>\n ,\n 1010<\/jats:fpage>\n (\n 2019<\/jats:year>\n )\n APOPAI<\/jats:pub-id>\n 0003-6935<\/jats:issn>\n 10.1364\/AO.58.001010<\/jats:pub-id>\n <\/jats:mixed-citation>\n ] Gonz\u00e1lez-Acu\u00f1a\n et\u00a0al.<\/jats:italic>\n claimed: \u201can analytical\n\t\t\t\t\tclosed-form formula for the design of freeform lenses free of\n\t\t\t\t\tspherical aberration and astigmatism.\u201d However, as we show here, their\n\t\t\t\t\tformula can only be applied when the object and image are both real,\n\t\t\t\t\tand the image is inversed; additionally, the refractive index in the\n\t\t\t\t\tobject and image media is the same. Here, we present the complete\n\t\t\t\t\tsolution of this particular formula.\n <\/jats:p>","DOI":"10.1364\/ao.379238","type":"journal-article","created":{"date-parts":[[2020,1,3]],"date-time":"2020-01-03T12:30:07Z","timestamp":1578054607000},"page":"3422","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["General formula to design a freeform singlet free of spherical aberration and astigmatism: comment"],"prefix":"10.1364","volume":"59","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2860-1222","authenticated-orcid":true,"given":"J. 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