I don't know about you, but I certainly appreciate being paid for my time and expertise when dealing with contacts. Even if I'm not making changes there is extra work and thinking that goes into the exam for a contact lens patient.
But thats part of the problem with contacts, so many practitioners (fitters and OD's alike) giving away their service and knowledge that many people will balk at CL related service fees. For this reason I personally don't feel inclined to try and build this part of my practice. Pittance for fees, whiny patients that return endlessly; no thank you!
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