luxvision LCP-7800, Руководство пользователя

Страница: 23 / 37

22
6.2 How to obtain correct Letter Size and focus
(Zooming Type only)
1. Install chart projector at desired position of 2.5~8m (8~26 feet)
2. Measure the distance from patient to screen
3. Refer to the test scale shown in the Appendix A
4. Have someone hold the test scale at the screen
5. Project the 20/400(6/120, 0.05) alphabet “C”
6. Adjust the position of the projector forward or backward and turn the
focusing wheel until “C” is brought in sharp focus within the respective
distance scale
It will be more accurate to the eye optometry when using the screen
7. Input and Use of Program
7.1 How to input user's program
Step 1. Press the “LIGHT” button once .
Results: The light goes out.
Step 2. Press the “PGM 1” button three times.
Results: The light will come on and the chart projector will display
the first chart of the default program.
Step 3. Select the first chart for your new program.
Press the “Program ►” button once .
Step 4. Select the second chart for your new program.
Press the “Program ►” button once .