Hidden inclinometer

Performed in a dark room. Adjust the level, height, and interpupillary distance of the oblique inclinometer (distance between near and far vision should be different) so that the subject's eyes are aligned with the oblique inclinometer sight hole. Ask the examinee to look forward. During the inspection, the long-range target light spot (1cm in diameter) was placed at 5m, and the short-range target light spot was placed at 33cm. First perform a long-range inspection for obliqueness and fusion, and then perform a close-up inspection. Those with refractive errors should be examined separately with naked eyes and glasses.