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Defocus can be corrected from \u22124.3\u2009\u2009D to +4.3\u2009\u2009D and vertical and oblique astigmatism from \u22122.5\u2009\u2009D to +2.5\u2009\u2009D. A contrast gain of 6.9 times was measured after aberration correction. In comparison with a 1.3-mm beam diameter OCT system, this concept achieved a 3.7-dB gain in dynamic range on a model retina. Both systems were used to image the retina of a human subject. As the correction of the liquid crystal device can take more than 60\u00a0s, the subject\u2019s spectacle prescription was adopted instead. This resulted in a 2.5 times smaller speckle size compared with the standard OCT system. The liquid crystal device for astigmatism correction does not need a high-voltage amplifier and can be operated at 5\u00a0V. The correction device is small (9\u2009\u2009mm\u00d730\u2009\u2009mm\u00d738\u2009\u2009mm) and can easily be implemented in existing designs for OCT.<\/jats:p>","DOI":"10.1117\/1.jbo.22.2.026005","type":"journal-article","created":{"date-parts":[[2017,2,14]],"date-time":"2017-02-14T09:30:52Z","timestamp":1487064652000},"page":"1-10","source":"Crossref","is-referenced-by-count":16,"title":["Optical coherence tomography with a 2.8-mm beam diameter and sensorless defocus and astigmatism correction"],"prefix":"10.1117","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6069-3027","authenticated-orcid":false,"given":"Maddipatla","family":"Reddikumar","sequence":"first","affiliation":[{"name":"Utsunomiya Univ."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ayano","family":"Tanabe","sequence":"additional","affiliation":[{"name":"Citizen Holdings Co., 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