APPLANATION TONOMETER USER`S MANUAL

APPLANATION TONOMETER USER`S MANUAL
APPLANATION TONOMETER
USER’S MANUAL
EQ-6703
1-800-255-6161• Fax 1-800-397-0013
www.amconlabs.com
CONTENTS
Disclaimer and General Safety Requirements .......................................2
1. Parts of the Applanation Tonometer .................................................3
2. Assembly .............................................................................................3
3. Preparing to Measure Intraocular Pressure......................................3
Equipment Preparation.......................................................................3
Patient Preparation .............................................................................4
4. Measuring Intraocular Pressure ........................................................4
5. Reasons for Errors in Measuring Intraocular Pressure ...................5
6. Maintenance ........................................................................................5
7. Specifications......................................................................................5
Amcon Applanation Tonometer
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DISCLAIMER
Amcon: The Eyecare Supply Center makes no representations or warranties,
either expressed or implied, with respect to the contents hereof and specifically
disclaims any warranties, merchantability or fitness for any particular purpose.
Further, Amcon: The Eyecare Supply Center reserves the right to revise this
publication and to make changes from time to time in the contents hereof without
obligation of this company to notify any person of such revision or changes.
NOTE: Neither Manufacturer nor distributor assumes any responsibility or liability
for any damages caused by negligence or ignorance of precautions in this
manual.
GENERAL SAFETY REQUIREMENTS
Please read the following warnings carefully to avoid injury as well as to not
damage the instrument.
WARNINGS
1. Do not use the instrument under flammable, explosive, or dusty
environments. Keep it clean and dry. Avoid high temperatures.
2. In case of trouble with the instrument, first read the manual for
troubleshooting to problem. If this does not solve the problem, contact an
authorized ophthalmic equipment service repairperson.
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Amcon Applanation Tonometer
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1. PARTS OF THE APPLANATION TONOMETER
Area to Attach to Slit Lamp
Tonometer Prism
Reading Adjustment
Knobs
Tonometer Prism Holder
Measurement Box
Extra Prisms
2. ASSEMBLY
All parts should be removed from packaging with great care in order to avoid
damaging the instrument. Insert the tonometer prism holder into the hole on top
of the measurement box. Place the area to attach to the slit lamp on the bar on
top of the accessories mount area (above magnification selection dial). Insert
disinfected tonometer prism into the tonometer prism holder.
3. PREPARING TO MEASURE INTRAOCULAR PRESSURE
Equipment Preparation
Disinfecting the Tonometer Prism: Remove prism from holder. Rinse prism
under running cold water to remove fluorescein and tears. Soak tip in 3%
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Amcon Applanation Tonometer
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hydrogen peroxide solution for 10 minutes. Rinse again thoroughly under
running cold water to remove all peroxide. Dry with a clean tissue or let air dry.
Return to holder.
Aligning Slit Lamp: Angle between the illumination arm and microscope should
be a 40 to 60° angle. Open the slit diaphragm to an 8mm round light spot.
Switch the filter to cobalt blue so that the yellow-green fluorescein can be seen
clearly.
Patient Preparation
Instill a topical anesthetic and a fluorescent dye to the patient’s eyes. Suggested
pharmaceuticals include a fluorescein/benoxinate combination drop or a
fluorexon/benoxinate combination drop. The doctor may instead choose to instill
anesthetic drop (such as 1% proparacaine) and apply a fluorescein strip.
4. MEASURING INTRAOCULAR PRESSURE
Adjust the prism so that the marks associated with 0 and 180 align with the white
marks on the prism holder. Position the patient’s head against the forehead rest
and the chin on the chin rest of the slit lamp. Instruct the patient to look forward
or past the doctor’s shoulder. If necessary, the doctor can assist in holding the
patient’s eyelids, being careful not to press on the eye.
Insure that the reading adjustment knob is set on 0. Move the slit lamp and
tonometer slowly towards the eye, so that the prism tip just touches the center of
the cornea. Watch through the oculars at the two small semicircle mires (Fig. 1).
Turn the reading adjustment knobs to increase the pressure on the cornea until
the two semicircle mires just overlap with one another (Fig. 2).
Fig. 1
Fig. 2
Remove the prism from the patient’s eye. Multiply the number from the reading
adjustment knob by ten to get the IOP reading in millimeters of mercury (mmHg).
Repeat on the other eye.
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Amcon Applanation Tonometer
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5. REASONS FOR ERRORS IN MEASURING INTRAOCULAR PRESSURE
PROBLEM
Thick Mires
SOLUTION
Have the patient blink to
remove some fluorescein and
measure again. Also wipe
the prism tip with tissue.
Thin Mires
Add more fluorescein
and measure again.
Only half of each mire
is in view
Too much pressure on the
cornea. Pull back slit lamp
and measure again.
Mires are not semicircles;
one mire is higher
or lower than the other.
Pull back slit lamp and readjust
height so the prism is centered
vertically on the cornea.
Mires are not
centered horizontally
Pull back slit lamp and readjust
height so the prism is centered
horizontally on the cornea.
6. MAINTENANCE
Protecting the Instrument
This instrument has been calibrated before leaving the factory. Do not
disassemble the instrument. The instrument should be used in a clean
environment.
Protecting the Tonometer Prism
Only clean the prism with 3% hydrogen peroxide. Do not use alcohol or acetone,
which can wear down the prism surface over time. Do not use UV light to
disinfect or sterilize the prism. Do no exceed temperatures of 60°C.
Cleaning
Clean the Applanation Tonometer only with a water dampened cloth, use soap
only. Do not immerse Tonometer in solution, or corrosive agents. No direct spraying.
7. SPECIFICATIONS
Range of Measurement
0-80 mmHg
Movement of Light Circle
1.53 x 2 = 3.06mm
Prism Diameter
7mm
Prism Range of Movement
3mm
Weight:
300g
Size:
190 x 80 x 80 mm
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