Welch Allyn PanOptic 118 User manual

PanOptic™ Ophthalmoscope

Eye Care Menu

Service Manual

118 Series

Operating
Instruction
Manual

©2001 by Welch Allyn, Inc. All rights reserved. No part of this manual
may be reproduced or transmitted in any form or by any means, elec­tronic or mechanical, including photocopy, without prior consent in writ­ing from Welch Allyn. Printed in the U.S.A.

Table of Contents

Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

The

PanOptic

Set-up Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Conducting an Examination with the

Ophthalmoscope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Apertures and Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

The Eye . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Lamp Replacement Instructions . . . . . . . . . . . . . . . . . . . 15

Cleaning and Repair Instructions. . . . . . . . . . . . . . . . . . . 16

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Accessory and Replacement Parts List . . . . . . . . . . . . . . 19

Service and Warranty Information. . . . . . . . . . . . . . . . . .20

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

™ Ophthalmoscope . . . . . . . . . . . . . . . . 4

PanOptic

Symbols

Attention. Read Operating Manual for Cautions and
Instructions for Use.

TYPE BF – Indicates this is a product with Type BF
applied parts (the patient eyecup).

The CE mark on this product indicates it has been tested
to and conforms with the provisions noted within the
93/42/EEC Medical Device Directive.

1

Warnings and Cautions

CAUTION: To minimize lamp housing temperatures, on­time should not exceed 2 minutes with off-time not less than
10 minutes.

CAUTION: No acute optical radiation hazards are identified
for ophthalmoscopes. However, Welch Allyn recommends
limiting the intensity of the light directed into the patient’s
eye to the minimum level that is necessary for diagnosis.
Infants, aphakes, and persons with diseased eyes are at a
greater risk. The risk is also increased if the examined per­son has had any exposure with the same instrument or any
other ophthalmic instrument using a visible light source
within the previous 24 hours. This will apply particularly if
the eye has had exposure to retinal photography. The
intended use of this device is for routine ophthalmic exams
on the order of typically less than 60 seconds per eye.
Although there is a benefit versus risk factor in any medical
procedure, these more complicated exams should not
exceed a three minute exam time in 24 hours. Significant
use of this device beyond its intended use is not recom­mended; it may cause harm to the eyes.

Use only PanOptic Patient Eyecups (part number 118092)
with this product.

CAUTION: Federal Law restricts this device to sale by or
order of a physician.

CAUTION: Spectrally weighted photochemical radiance LB
and LA give a measure of the potential hazard that exists for
a beam of light to cause photochemical damage to the retina.
LB gives the measure for eyes in which a crystalline lens is
not in place. LA gives this measure either for eyes in which
the crystalline lens has been removed (aphakes) and has not
been replaced by a UV-blocking lens or for the eyes of very
young children.

The value stated for this ophthalmoscope gives a measure of
hazard potential when the instrument is operated at maxi-

2

mum intensity and maximum aperture. Values of LB or LA over

17.50 mW/(cm2*sr) are considered high.
The retinal exposure dose for a photochemical hazard is a product

of the radiance and the exposure time. For instance, at a radiance
level of 17.50 mW/(cm2*sr), a 3-minute exposure would produce a
retinal exposure dose level at the recommended limit. If the value
of radiance were reduced to 8.75 mW/(cm2*sr), twice that time (i.e.
6 minutes) is needed to reach the recommended limit. The
recommended exposure dose is based on calculations using the
American Conference of Governmental Industrial Hygienists
(ACGIH) Threshold Limit Values for Chemical Substances and
Physical Agents (2000 edition).

The 118 Series Ophthalmoscope has spectrally weighted
photochemical radiances at maximum intensity and

maximum aperture of .287 mW/(cm2*sr) for LB and.306
mW/(cm2*sr) for LA (aphake). The relative spectral output of

the device is shown on page 3.

Welch Allyn 118 Series Ophthalmoscope

(W/cm^2)

Relative Spectral Irradiance

300

345

390

435

480

525

570

615

660

705

750

795

840

885

930

975

1020

Wavelength (nm)

1065

3

The

PanOptic

Transparency of the cornea, lens and vitreous humor permits the
practitioner to directly view arteries, veins, and the optic nerve of
the retina.

Direct observation of the structures of the fundus through a PanOp­tic Ophthalmoscope may show disease of the eye itself or may
reveal abnormalities indicative of disease elsewhere in the body.
Among the most important of these are vascular changes due to dia­betes or hypertension and swelling of the optic nerve head due to
papilledema or optic neuritis. In this sense, the eye serves as a win­dow through which many valuable clinical evaluations may be
made.

When a preliminary diagnosis of an imminently dangerous eye con­dition, such as acute (angle-closure) glaucoma or retinal detach­ment, is made by the examiner, prompt referral to an eye specialist
may prevent irreversible damage. Or, when distressing but less
urgent conditions, such as visual impairment due to cataract or vit­reous floaters, are recognized, the patient can be reassured and
referred.

A

™ Ophthalmoscope

F

B

C

A Patient Eyecup D Aperture/Filter Dial

B Patient’s Side E Focusing Wheel

C Soft Grip Handle F Practitioner’s Side Brow Rest

4

E

D

Set-up Instructions

Attaching the

PanOptic

Welch Allyn Power Source

Align cutouts in the PanOptic Ophthalmoscope base with lugs on
power source. (The PanOptic Ophthalmoscope fits all 3.5v Welch
Allyn power sources.) Push in slightly and turn 90 degrees.

Ophthalmoscope head to a

TURN HANDLE
COUNTER­CLOCKWISE

Attaching the Patient Eyecup to

Use only PanOptic Patient Eyecups (part number 118092)
with this product.

Insert eyecup into the patient’s side
of the instrument. Push and twist in
one motion until you feel the two
“lock” together.

See “Accessory and Replacement
Parts List” on page 19 to reor der ne w
PanOptic Patient Eyecups.

5

PanOptic

TWIST