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Fitting Philosophy
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Smaller diameter lenses will not vault over the high irregularities found in these corneas. Optical zone not in pupil area, poor V.A.
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A large diameter with a large optical zone is a MUST. Covers the irregularity and places optical zone in front of pupil for good V.A.
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These cones require a larger diameter lens with a larger optical zone so the peripheral curves do not get in front of the pupil and cause poor vision. Poor positioning gives poor V.A. and possible poor corneal health.
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Covers irregularity and places optical zone in pupil area and maintains good corneal health.
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A large diameter is needed to vault over the host area. Potential to damage host/graft interface area and poor comfort. |
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Covers graft area providing good comfort, V.A. and corneal health. Should the graft "sink" and flatten in the center, a reverse secondary curve design is best.
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