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Starting Trial lens:
Start with the Dyna Cone Series when trial fitting. It has our standard back optical zones. If you get flare and glare or mid-peripheral seal off, go to the Dyna
Cone Plus+ Series which has an optical zone .4mm larger than the Dyna Cone Series. To convert directly from a Rose K fit, use the Dyna
Cone Plus+ with the same B.C. and power but with an edge lift 1 step steeper than what the Rose K is.
Topographical numeric map uses the 2 mm average scale as your starting lens. If your maps do not have this scale, use the average of the Sim Ks as a starting point. Use the average of the K readings from a manual keratometer.
Desired Fluorescein Pattern:
The Dyna Cone and Dyna Cone Plus+ Series are designed as a light feather touch fit. The rest of the pattern should be as alignment looking as possible. Edge lift should be 1.0 mm with movement of 1.0 mm to 1.5 mm.
Diameter Selection:
The Dyna Cone and Dyna Cone Plus+ Series come in standard diameters 8.0 mm, 8.4mm, and 8.8mm., but are available from 8.0 to 9.9mm. Start with the 8.8mm in most cases. The exception would be a very steep cone where the 8.4 would
be a good diameter to start with.
Edge Profile:
The desired edge lift will show 1.0 mm of clearance. The Dyna
Cone and Dyna Cone Plus+ Series systems starts with a standard edge lift. Flatter or steeper edge lifts are available in a step system. You can order any edge profile in step1, step 2, step 3, as needed. This is
for flatter or steeper edge lifts. All of these changes are computer controlled to insure reproducibility.
Examples - Should the standard edge profile show pinch off, start with 1 step flat edge profile. This should be adequate in most cases. If edge pinch off is still present with 1 step flat, go to a 2 step flat edge profile. Increase edge profile as needed to achieve desired 1.0 mm of edge clearance.
The same is true in reverse. If standard edge profile shows too much edge lift, steepen the edge lift to 1 step steep. Decrease edge profile as needed to achieve the desired 1.0 mm of edge clearance.
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