公开(公告)号：WO2022136729A1

公开(公告)日：2022-06-30

申请号：PCT/FI2021/050874

申请日：2021-12-14

申请人： OPTOMED OYJ

发明人： ALASAARELA, Ilkka ,  SÄIPPÄ, Kalle ,  LIPPONEN, Juha ,  RÖNKKÖ, Seppo

IPC分类号： A61B3/12 ,  A61B5/1455 ,  A61B5/00

摘要： A focus measuring arrangement for ophthalmic examination comprises an infrared light source system (100), which directs infrared light to a pupil (152) of an eye (150) of a person (156) and forms a focusing pattern (130) of the infrared light on a retina (154). A receiving arrangement (102) apertures (120A, 120B) receives the infrared light of the focusing pattern (130) from the retina (154) through separate areas (122A, 122B) of the pupil (152). An image forming arrangement (104) causes the infrared light passed through the apertures (120A, 120B) to form an individual image (124A, 124B) of the focusing pattern (130) for each of the apertures (120A, 120B) in an image space (110) of the receiving arrangement (102), the image forming arrangement (104) causing an optical correspondence between the at least two apertures (120A, 120B) and the separate areas (122A, 122B) of the pupil (152). A detecting surface arrangement (106) is located at a non-zero distance behind the at least two apertures (120A, 120B) and the image forming arrangement (104) in a direction of propagation of the infrared light reflected from the retina (154) for receiving the infrared light passed through the at least two apertures (120A, 120B). A data processing unit (108) forms focusing adjustment information based on locations ((XA, YA), (XB, YB), (XC, YC)) of illuminated spots (126A, 126B, 126C) of the infrared light of the focusing pattern (130) on the detecting surface arrangement (106), and outputs the focusing adjustment information for further processing.