LIGHTMED TruScan Pro – Operator’s Manual Rev. No. 01 Page 11 of 109
The optical density (OD) of eye protection must be greater than or equal to 4 (≥ 4) and the range
that includes the wavelengths of 532 nanometers (nm), 561 nm, 577 nm, 670 nm, or 810 nm is
also specified on it. The safety glasses specifications are typically shown in this format:
OD4+ @ 577 / 670 nm, or 532 / 810 nm, or 561 nm
Otherwise, the safety glasses are NOT suitable for eye protection purposes that meet the
standard requirements of this laser. Safety glasses are required to have the CE mark if used in
the European Union.
The TruScan Pro laser uses a Class II Laser Diode Aiming beam. Its wavelengths range from 635
to 650 nm and the maximum power output (to be delivered to the patient’s cornea) is set at the
factory to be less than 1 milliwatts (mW) (< 1 mW). It is recommended to use the lowest aiming
beam intensity during treatment. This laser’s classification as Class IV is also based on the
Accessible Emission Limits (AEL), as mentioned in the standards above.
2.3.1 Nominal Ocular Hazard Distance (NOHD)
The Nominal Ocular Hazard Distance (NOHD) specifies that the distance between the equipment
and a patient’s eye, where the optical power from the equipment enters the dilated pupil of the
patient, should be less than or equal to the maximum permissible exposure (MPE) (≤ MPE), as
specified in the standards (i.e. less than a Class I laser output).
The calculated NOHD for the TruScan Pro Laser with different LDUs is as follows:
Therefore, when the laser is being used, all persons who are closer to the laser than the distances
mentioned above should be wearing eye protection. Patients should have the untreated eye
covered or protected from laser reflections.
2.3.2 Avoid Exposure to Laser Beams
Reassembly or maintenance of the laser system should only be performed by authorized and
trained personnel. The external housing of the laser system should never be removed. Otherwise,
the user and/or observers could be exposed to dangerous levels of laser radiation and potentially
lethal electrical voltages.
The eye safety filters are equipped on the LDUs as follows:
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