32
11625-101-Rev. L
Cleaning & Maintenance
(continued)
Cleaning
(continued)
Cleaning the Lenses
(continued)
1. In a thorough cleaning procedure, there are a total of 168 lens surfaces to be cleaned. Lens
surfaces can be reached for cleaning through the front or rear instrument apertures and it should
not be necessary to separate the dials.
Note:
A common rubber ear syringe will be found useful in blowing dust from lens surfaces.
2. Use caution to keep the syringe clean so that it will not soil lens surfaces which it may acciden-
tally touch. If dust persists, then a careful, light brushing of the lens surface with a camel’s hair
brush followed by syringe action will often prove helpful.
3. For complete cleaning of lenses, a soft surfaced cleaning tool is desirable. An efficient cleaner
can be fashioned by rolling a strip of soft, lint-free linen around a slim, soft-wood stick so that
a roll of cloth about 3/16” - 1/4” in diameter with a flat end is formed. The cloth should project
beyond the end of the supporting stick. As the cleaning end of this tool becomes soiled, clip the
soiled end with scissors to expose a new clean surface or reroll with fresh cloth. Slightly moist-
ening the tip of this tool with lens cleaning solution is desirable.
4. Indirect illumination from a standard lamp bulb through the instrument apertures will help identify
soiled lenses. Lenses may be cleaned with the Phoroptor in place on the instrument stand for
easiest handling or the instrument may be removed and supported on a sturdy, padded table.
Cleaning Procedure
1. Rotate the Turret Assembly so no loupes are in front of viewing apertures.
2. Set all scales at zero or open.
3. Adjust PD to its extreme position (75 mm.)
4. Set the instrument for distance (unconverged.)
5. Clean lenses by dialing the following lens powers into position consecutively and cleaning
both front and back lens surface as each one is brought to the aperture:
a. Cylinder powers:
.25
.50
.75
1.00
1.25
2.50
3.75
5.00
b. Return Cylinder Power Scale to zero.
c. Sphere powers (by rotating the knurled dial):
+1.75 +1.50 +1.25 +1.00
+.75
+.50
+.25
-.25
-.50
-.75 -1.00
d. Return Sphere Power Scale to zero.
e. Sphere powers (by rotating the strong sphere control):
+3.00
+6.00 +9.00 +12.00
+15.00
-18.00 -15.00
-12.00
-9.00
-6.00
-3.00
f. Return Sphere Power Scale to zero.
g. Auxiliary Lens Dial (by positioning Auxiliary Selector Knob):
Retinoscopic
Polarizing
(Analyzer)
Maddox Rod
Maddox Rod
Vertical
Horizontal
Red Filter
+0.12 Sphere
Fixed Cross Cylinder Dissociating Prism
h. Now clean front and rear surfaces (exposed surfaces only) of the Rotary Prism Loupe,
Cross Cylinder Loupe, and lenses in the accessory case.
