以角膜顶点至黄斑中心凹距离作为视轴长度，此连线上测量硅油后间隙的厚度。
The length of the visual axis was the distance from the corneal vertex to the macular fovea, and it was also measured by A-mode ultrasound in sitting position with different ultrasonic velocity.
以角膜顶点至黄斑中心凹距离作为视轴长度，此连线上测量硅油后间隙的厚度。
The length of the visual axis was the distance from the corneal vertex to the macular fovea, and it was also measured by A-mode ultrasound in sitting position with different ultrasonic velocity.
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