The Ahmed model adds in arcs at a 9.5 mm OZM and marks at 90°, 75°, 45°, and 30° .
The Arc model features the steep meridian line as well as a partial capsulorhexis optical zone mark.
The Fin model is simply three marks, two of which form the steep meridian and the third functions as a 90° cardinal reference point.
Ideally used for:
• Astigmatic correcting surgery (LRI, AK)
• Toric lens implantation
• Premium multi-focal lens implantation
• Steep meridian marking
• 90° reference or Capsulorhexis
Video by Iqbal 'Ike' K. Ahmed
Saul Ullman, MD using the MD OneStep
Saul Ullman, MD
“I have used the Davis MD OneStep marker in combination with the Visual Axis Glasses for over three years. It has improved my precision and accuracy versus the multiple previous marking systems I have used previously. The Mastel system allows me to make both marks simultaneously on the desired final meridian. This eliminates the need to make a reference mark and then make a second mark (decreasing the chance of an error). I also feel the fine etch that is placed on the cornea helps me align the mark on the toric IOL more precisely. I routinely dry the cornea with the patient supine and find the etch mark is clearly visible against the red reflex.
The technique I have found most helpful is to then use a 25 gauge needle “painted” with a sterile marker to highlight the etch with a very fine line (when the cornea is dry). I had to use my previous two step marking system when another surgeon was utilizing my One Step Marker. I felt this was a significant step backwards and ordered a second marker that day.
The One Step Mark and Visual Axis Glasses are made with the precision and quality that we all have come to expect from Mastel.”
Words About The OneStep
“I’m pretty sure you won’t be returning this,” said Doug Mastel after lending me the Davis Premarker. My friend and mentor Ike Ahmed had taught me to keep a healthy skepticism and so I thought “We’ll see…” I knew within the first week of using the set that Doug was right.” Read More…