Optos P200T E Series, User Manual, Page: 12 / 72

Chapter 1 - Warnings and cautions
CAUTION
Day to day use - operators
The protection provided by the equipment may be impaired if the equipment is used in a
manner not specified by Optos.
The use of this device or any other device which uses light for ocular examination should
not be prolonged unnecessarily.
Do not place any optical elements, with the exception of the patient wearing contact
lenses, between the device and the patient’s eye.
Do not use lint cloths, tissues, or other materials that may create dust, on or near the scan
head. Always allow cleaned areas to air-dry.
The device requires low levels of room light to operate efficiently. Take care to avoid
accidents when working under low light conditions.
Do NOT touch the air vents.
Only use the fabric cover when the scan head is powered off or in standby mode. Remove
the fabric cover before operating the scan head.
OCT scans are described using external angles which can be converted to the nominal
'mm' using the scale factor derived from the wide-angle schematic eye model published
by
Navarro et al
1.
. The nominal scale factor is 3.47 degrees/mm for posterior region.
CAUTION
Day to day use - patients
Patients must not operate this device.
The patient should not touch the touch screen. The patient should only be in contact with
the forehead pad, chin pad and face pad.
When angiography images are being captured additional space will be required to allow
the injection of the dye and for other individuals involved in the procedure. These
individuals could include medical staff or patient helper.
Do not inject the patient until the appropriate point in the angiography procedure.
Do not capture images when the face pad is not in place.
Do not lean on the head rest, chin rest or table.
Ensure the head rest or chin rest do not restrict the patient’s access to the device.
The face pad may get warm during use.
The scan head will move when the alignment system is being centered. This will happen
automatically when the device is switched on and when the alignment system is re-
centered between patient sessions. You should ensure that there is space around the
scan head to allow free movement.
CAUTION
Signal to Noise Ratio
SNR
2
has a major impact on OCT image quality and therefore could determine the ability
to distinguish the retinal layers, see SNR and OCT scan quality on page 46.
1. Isabel Escudero-Sanz and Rafael Navarro, "Off-axis aberrations of a wide-angle schematic eye model," J. Opt. Soc. Am. A 16, 1881-1891 (1999).
2. Signal to noise ratio
Page 12 of 72 Part Number: G110230/1ENG
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