Eye Illumination Safety; Eye Safety And Comfort; Visibility Of Illuminator; Illuminator Warm-Up Period - SR Research EyeLink Portable Duo User Manual

6.2 Eye Illumination Safety

6.2.1 Eye Safety and Comfort

The EyeLink Portable Duo complies with the IEC-62471 lamp safety standards,
and meets requirements as an "exempt" device, which is safe under any
conditions, including using optical viewing devices and lenses. The internal
illuminator emits near-infrared (NIR) radiation. Though safe, this radiation may
still cause slight discomfort due to its warming and drying effect on the eye, so
some additional precautions are given below.
Do not look at the illuminators (which are positioned on the right side of the
•
optical window) from closer than 100 mm for extended periods of time. This
will result in excessive IR exposure, resulting in "dry eye" discomfort.
Minimize time participants spend using the eye tracker, to reduce any
•
discomfort to sensitive or irritated eyes.

6.2.2 Visibility of Illuminator

Though nominally invisible, the human eye has some residual sensitivity to NIR
light. The illuminators used in some models will be clearly visible in moderately
lit rooms, though this is not expected to compromise most tasks.

6.2.3 Illuminator Warm-Up Period

The light output of the illuminators may change slightly for a period after the
eye tracker is started up after extended shutdown. For applications where
illumination level is critical, it is recommended that at least 10-15 minutes be
allowed for the illuminators to reach a stable temperature before use. This
warm-up period will also allow the camera circuitry to reach its operating
temperature, resulting in best image quality and most stable eye tracking
performance.

6.3 SERVICING INFORMATION

WARNING: Changes or modifications not expressly approved by SR Research
Ltd. will void the warranty and authority to operate the equipment. This
includes modification of cables or opening unit without express instructions
from the manufacturer.
WARNING: Opening or modifying the eye tracker, including exchanging cables,
will void the warranty and may affect safety compliance of the system. No user-
serviceable parts inside — contact the service provider at the address listed
below for all repairs or modifications.
In the event of failure, cable damage, or immersion in fluids, the EyeLink
Portable Duo should be replaced as a unit, as there are no user serviceable
Important Information
© 2016-2017 SR Research Ltd.
107