Welch Allyn 93400 COMPAC SET - User Manual - Manual (Page 7)

Retinoscope
(with CompacSet Portable Ophthalmic Set only)
Retinoscope Features
• External focusing sleeve allows for easy
adjustment no matter what size hand or
how instrument is held. Continuous 360˚
rotation.
• Dust free optics to keep instrument
clean longer.
• Fixation cards that easily attach for use
during dynamic retinoscopy.
• Collapsable head for compact size (protection against damaging optics).
Retinoscope Operation
The operator will note that the width of the streak varies as the sleeve is
raised and lowered. When the operating sleeve is in the lowest posi-
tion, the light rays emitted are slightly divergent.
Here the instrument acts with a plano mirror effect, which
reflects divergent rays that will never come to a focus. As the
sleeve is raised, the streak focuses. With the sleeve all the way
up, the retinoscope acts with a concave mirror effect,
where the light rays cross, the eye’s reflex moves in
opposite directions with the concave mirror
effect as compared to the plano mirror effect.
The rotary movement of the control sleeve
mechanism allows the streak to rotate 360˚ to ascertain the axis of astigmatism.
CompacSet Power Handle
Recharging Nickel Cadmium Batteries
1. Plug charger into the appropriate outlet and plug other end into the
receptacle on the handle. Use Welch Allyn 710 Series Charger only.
2. To ensure full charge and long lamp life, turn on/off switch to off position
(center) or be sure both heads are folded in.
3. Insert the charger cord into the receptacle near the battery compartment of
the power handle.
NOTE: AA batteries or other manufacturers’ rechargeable batteries will not
charge in this handle. The Welch Allyn battery #72610 is the only battery that
will recharge in this handle.
PATENTS 5, 189, 449 & PENDING
Dust free
optics
Rubber
brow rest
Focusing
sleeve
7
WAM600-9407-CompSet 12/7/01 10:58 AM Page 7