Yeasn YPA-2100, Руководство пользователя, Страница: 11 / 91

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1.Horizontal adjusting knob
Adjust the horizontal level of the vision tester.
2.Forehead baseplate indicator
Make sure the forehead of the testee contact the baseplate. The indicator is always on when the
forehead doesn’t contact the baseplate; the indicator is off when the forehead contacts the baseplate.
3.Forehead baseplate knob
Adjust the distance of the testee’s corneal vertex
4.Near vision indicator
Light up short-distance visual chart during short-distance test.
5.Cornea observation window
Observation distance should be 200mm-250mm
。
The window through which to observe and
confirm the distance of the tester’s corneal vertex.
6.Testing window
Light aperture for testing.
7.Short-distance vision rod
Install and support the short-distance visual chart.
8.Short-distance visual chart
For testing short-distance vision.
9.Spirit level
Confirm the horizontal location of the vision tester. Rotate the horizontal adjusting knob to keep the
air bubble in the spirit level in the middle.
10.Nose baseplate
The nose or face of the testee may contact the nose baseplate during vision test. Clean this part
before every time of vision test.
11.Forehead baseplate
The forehead of the testee may contact the forehead baseplate during vision test. Clean this part
before every time of vision test.
10.Nose baseplate