13
5. Setting up and using the Spectra Iris
F
Interpupillary Distance Setting Control (F)
Because the eyes are dissociated, particular care must
be taken to ensure the optics (eyepieces) are set properly
in front of each eye.
Place an object, perhaps the thumb, approximately 40cm
from the face and centre it horizontally in the light patch.
Then, close one eye. Using the thumb and forefinger of
the opposite hand, slide the P.D.Control (F) of the open
eye (located directly under each eyepiece) so that your
object moves into the centre of the field, keeping the object
in the centre of the light patch. Repeat for the other eye.
