Topcon TRK-2P, Руководство пользователя

Страница: 108 / 118

106
GENERAL INFORMATION ON USAGE AND MAINTENANCE
OPERATION PRINCIPLE
REF measurement:
The instrument projects a near infrared light to retina and the reflected image is received by a CCD
camera, and the spherical refractive power, cylindrical refractive power and the axis of astigmatism
that are required for the correction lens for making a patient's eye stigmatism, are determined through
computation.
KRT measurement:
The instrument performs corneal curvature radius measurements through computation by projecting a
kerato-ring to the cornea and receiving the reflected image by a CCD camera from the cornea surface,
and by the corneal curvature radius computes the corneal refractive power, corneal astigmatic power,
and corneal astigmatic axis angle.
Ocular Pressure Measurement:
By ejecting air from the measuring nozzle to the cornea, detect by a pressure sensor the internal cylin-
der pressure required for the cornea to reach a prescribed deformed state (with a certain plane area),
and calculate the ocular pressure value by computing.
Cornea Thickness Measurement:
The slit light is projected onto the patient cornea at a slant, and the corneal thickness is measured by
processing the reflected light, which is received by a sensor, from the corneal surface and the corneal
back.
CHECKPOINTS FOR MAINTENANCE
1. Regularly maintain and check the equipment and parts.
2. When resuming the use after a long period of storage, verify that the instrument operates cor-
rectly and safely.
3. To ensure the correct reading, do not mar the measuring window with finger prints, dust, etc.
4. If the measuring window is soiled, clean it following the "CLEANING THE MEASURING NOZZLE
AND THE GLASS INSIDE THE MEASURING NOZZLE" instructions on page 93.
DISPOSAL
When disposing of the instrument and/or parts, follow local regulations for disposal and recycling.
NOTE
This symbol is applicable for EU member countries only.
To avoid potential damage to the environment and possibly human health, this instru-
ment should be disposed of (i) for EU member countries - in accordance with WEEE
(Directive on Waste Electrical and Electronic Equipment), or (ii) for all other countries, in
accordance with local disposal and recycling laws.
[WARNING]
This Product Contains Mercury in the backlighting of the LCD display. Prior to disposal remove or
otherwise ensure that this is disposed of in accordance with Local, State and Federal Laws. This
information is applicable in U.S.A only.
This product contains a CRL Lithium Battery which contains Perchlorate Material-special
handling may apply.
See http://www.dtsc.ca.gov/hazardouswaste/perchlorate/
Note; This is applicable to California, U.S.A. only