OPHTALMIC APPARATUS

• Main Authors: SAIKA, Makoto, SAKAI, Jun, FUJII, Kouta
• Format: Patent
• Language: English; French; German
• Published: 16.08.2023
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEDICAL OR VETERINARY SCIENCE; SURGERY

An ophthalmic apparatus (1) of an exemplary embodiment is capable of applying OCT to the fundus (Ef) of a subject's eye (E), and includes an optical system, an optical scanner (44), an optical path length changing device (41, 114), a focus adjustment device (43, 43A), and a controller (210, 231). The optical system splits light output from a light source (101) into measurement light (LS) and reference light (LR), projects the measurement light onto the fundus (Ef), generates interference light (LC) by superposing returning light of the measurement light (LS) from the subject's eye (E) on the reference light (LR), and detects the interference light (LC). The optical scanner (44) deflects the measurement light (LS) in a two dimensional manner for scanning the fundus (Ef). The optical path length changing device (41, 114) changes at least one of an optical path length of the measurement light (LS) and an optical path length of the reference light (LR). The focus adjustment device (43, 43A) performs focus adjustment of a measurement arm. The controller (210, 231) calculates an estimated value of an axial length of the subject's eye (E) from a process of controlling the optical path length changing device (41, 114), performs focus adjustment of the measurement arm to calculate an estimated value of a diopter of the subject's eye (E) from a process of controlling the focus adjustment device (43, 43A), and controls the optical system and the optical scanner (44) based on a deflection range of the optical scanner (44) set based on the estimated value of the axial length and the estimated value of the diopter.