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在镜片箱内有一个黑胶木片,其中央有一长约20毫米,宽约1毫米的裂隙,这就是裂隙镜片。用裂隙镜片试镜验光,特别是验散光,是十分方便的。 原理:裂隙镜片可以将裂隙方向以外的各子午线的光线挡住,而只让裂隙所在方向子午线的光线通过入眼。如裂隙在90度方向时,则90度以外其他子午线的光线全被遮挡。裂隙在120度子午线方向时,则180度子午线以外其他方向的光线也就全被挡住了,对于散光眼来说,不同方向子午线的屈光力量是不同的,视力也有差别,矫正不同子午线屈光不正的镜片度数,当然也就各不相同了。 方法:具体操作分三个步骤: 1.首先确定有无散光:把裂隙镜片在受检眼前缓慢旋转一周,如果视力没有变化,说明没有散光;如果
In the lens box there is a black wood chips, the center has a length of about 20 mm, a width of 1 mm cracks, which is the slit lens. With the slit lens audition test, in particular, experience astigmatism, is very convenient. Rationale: A slit lens blocks the rays of the meridian beyond the direction of the fracture, leaving only the meridian light in the direction of the slit to pass through. If the crack in the 90-degree direction, then all other 90-degree meridian light is blocked. Crack in the 120-degree meridian direction, then the 180-degree meridian light in all other directions will be blocked completely, for the astigmatism eye, the different direction of the meridian refractive power is different, visual acuity is also different, correct different meridian refractive Irregular lens degrees, of course, different. Methods: The specific operation is divided into three steps: 1. First, determine whether the astigmatism: the slit lens in the eyes slowly rotated a week before, if the vision has not changed, indicating no astigmatism; if