Highly precise marking is of the utmost importance for perfect correction of corneal astigmatism. Ideally, the cylindrical parts of the cornea and toric IOL balance each other out perfectly, while in the worst case, the cylinder strengths are combined, and the IOL astigmatism is added to the corneal astigmatism that already exists.
(G. Gerten, O. Kermani: "Toric IOLs for Astigmatic Correction", Cataract & Refractive Surgery Today Europe, Nov./Dec. 2006)

Precise pre-operative marking can now be realized with the new corneal marker. TOMARK makes it possible to mark the final torus position of the IOL on the cornea. Direct adjustment of the angle with an accuracy of 5° enables TOMARK to precisely stain the calculated cylinder axis.

As the marking is done while the patient is sitting upright, faulty markings due to cyclotorsion are prevented. Cornea marking at a reclining patient is subject to be off by up to 11° due to cyclotorsion. (T. Kohnen et al.: "Cyclorotation of the eye during wavefront LASIK with static iris recognition tracker", Der Ophthalmologe, Volume 104, Nr. 1, Springer Berlin)

The adjustable cornea marker offers variable use, either on the slit lamp or in combination with the held-hand pendulum instrument.

TOMARK will take enough dye by briefly pressing it onto the ink-pad. In many cases an eye speculum is not necessary which enhances patient comfort.

At the slit lamp the cornea marker is simply plugged into the tonometer fixation device and adjusted to the horizontal axis of the tonometer fixation device.

After plugging the cornea marker to the hand-held pendulum the horizontal line can be adjusted here as well.

The view through the cornea marker simplifies centering the marking on the cornea. TOMARK will leave a very distinguishable marking after only 5 seconds contact with the cornea.