An electronically controlled focusing system using dual light wedge split image for fundus imaging
In order to achieve precise focusing during fundus imaging,an electronically controlled focusing system using dual light wedge split image was designed.A 905 nm near-infrared semiconductor laser was used to form a rectangular sight mark on the retina through a dual light wedge and a rectangular slit.The movement of the sight compensation mirror and the dual light wedge mechanism was realized by motor control,and the displacement correlation between the sight compensation mirror and the dual light wedge was obtained.According to the separation of the rectangular sight mark,the defocus compensation state was real-time feedback,and the control system was guided to move the dual light wedge and the sight compensation mirror to achieve accurate focusing during fundus imaging.The focusing experiment of fundus imaging was conducted on the simulated eye,and the result showed that system can achieve-10 m-1～10 m-1 refractive compensation,and the focusing accuracy was more than 1 m-1.The electronically controlled focusing system using dual light wedge split image has fast focusing speed and high precision,which provides a basis for the development of automatic fundus imaging instruments.
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