PRODUCT INFORMATION - Orientation Marks
The KeraSoft®3 trial lenses are all prism
ballasted and have a vertical orientation mark at the base of the
lens. The position of this trial lens mark is important when you
order a toric lens, as it affects the axis of the final lens.
For example, if you find the mark on the trial lens is 20°
nasal on slit lamp and the over refraction gives a cyl at 180°, you
would have to order the axis at 160° to ensure the cyl sits at the
correct axis. Alternatively, you could give us the over refraction
as you find it and let us know the orientation mark position and we
will calculate it for you. Many slit lamps have a facility for
rotating the beam to align with orientation marks, for more accurate
assessment.
Ordering Information
When ordering, please let us know whether you want us to
compensate for rotation or whether you have done this yourself.
When ordering, please give us the following information:
BCOR and power of trial lens used
Orientation mark position (or indicate that you have taken
rotation into account)
Over refraction
HVID
BVD
