Reichert LongLife User's Guide download pdf (Page 7)

12084-101 Rev. D Page 7

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PROJECTION RANGE (FIGURE 1)

Minimum

Maximum



Refraction Distance (FT.)

PROJECTION RANGE LIST (FIGURE 2)

MINIMUM MAXIMUM

PROJECTION REFRACTING REFRACTING

DISTANCE DISTANCE DISTANCE

FT M FT M FT M

8 2.5 6.6 2.0 9.9 3.0

9 2.8 7.7 2.4 11.5 3.5

10 3.1 8.7 2.7 13.0 4.0

11 3.4 9.8 3.0 14.5 4.5

12 3.7 10.9 3.4 16.1 5.0

13 4.0 11.9 3.7 17.6 5.4

14 4.3 13.0 4.0 19.1 5.9

15 4.6 14.1 4.3 20.7 6.4

16 4.9 15.1 4.6 22.2 6.8

17 5.2 16.2 4.9 23.7 7.3

18 5.5 17.3 5.3 25.3 7.8

19 5.8 18.3 5.6 26.8 8.2

20 6.2 19.4 6.0 28.3 8.7

INSTALLATION AND ALIGNMENT



following procedures:

1. If using a wall mount, it is best to locate a wall



2. The following distances are important in the

setup of a refracting room:



to the distance from the patient’s eye to the

screen.



the distance from the slide to screen.

LETTER HEIGHT (LH) The height of a 20/200



distance times the tangent of 50 minutes of arc

or .014545.

LH (inches or mm) = RD (inches or mm) x

.014545

For example, a refracting distance of 240 inch-



inches (240 inches x .014545 = 3.49 inches)

3. Determine the refracting distance by measur-

ing the distance from the patient to the screen.

Please refer to Figures 1 and 2 which show

-

tances achievable with this system.

  

NOTE: To ensure maximum performance from your





 

support barrel. Do not fully tighten the outer

-

-



and (9). It may be necessary to loosen lock

screws (11) and (12) to provide freedom of

movement.

6. Attach the LongLife P-O-C head to the mount

by unscrewing the mounting knobs (5) insert-



knobs into the proper position. Fully tighten



7. Insert a character slide into the instrument and



the screen.

8. Check the three dimensional alignment of the











be. See Figure 3.

  





yoke screws (18) and mounting knobs.

10. Determine the proper letter size based on the

refracting distance used. Refer to Figure 4 and

the Letter Sizing Chart on pages 11 & 12.

11. Attach Letter Sizing Chart to the screen.

 

usually in opposite directions, until the 20/200



the Letter Sizing Chart as shown in Figure 4.

 

screws.

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