Originally Posted by
chip anderson
Bottom line on cones, is you need a rigid lens that:
A: Has a vault or at least a brush only centrally.
B: Rest mostly on the mid area of the cornea without impenging on circulation.
C: Centers well enough to see through.
D: Has a good circulation of tears.
E: Has at least some movement.
If patient's lens meets all of the above criteria I wouldn't change anything. If not re-fitting is indicated. Rose K is a good design although I haven't used it much, and when I have I have obtained a trial set (as I would on any cone fitting) and just slopped lenses on until either an optimum or near optimum fit (which I could give changes to the lab on) and refract with trial lenses over.
The actual name brand or even the material doesn't matter too much. As long as you are familiar with one method (design) and get good results, what more can you ask? Soper cone is OK, lens of your own design is OK, Rose K is OK, as long as it works and does no harm. Another concideration is that if you use a particular lab and they are familiar with design X then that's probably a good one to use.
Another comment, is I have had and seen relatively poor results with all soft lenses for cones.
Chip
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