Fitting
and Verification
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Course
Introduction
Although PMMA lenses are rarely fit today, the principles applied in
fitting them are fundamental to all rigid lenses and are covered in
this course. We'll begin with a discussion of palpebral lenses as well
as larger lenses with wide peripheral curves. The general characteristics,
advantages, and disadvantages of each will be discussed. This will be
followed by methods and procedures for selecting base curve, diameter,
optical zone width, peripheral curves, and thickness through the use
of diagnostic lenses, nomograms and charts. Examples and practice exercises
are included. Dynamic flourescein patterns are used to assist in the
evaluation of the fit of rigid contact lenses. How and why this is accomplished
is covered in the second half of this course. We'll illustrate flourescein
patterns of a spherical base curve on a spherical cornea, and spherical
base curves on a toric cornea are presented. Astigmatism with the rule,
against the rule, and oblique will be discussed and observed. Soft lens
evaluation is then covered to include fitting goals and the characteristics
of a good fitting soft lens. We conclude with a presentation of rigid
and soft lens verification techniques to include the use of the measuring
hand magnifier, diameter gauge, projector inspection devices, slit lamp,
radiuscope, thickness gauge, lensometer, and profile analyzer. We'll
see that soft lenses too can be verified through the use of a hand magnifier,
plastic templates, a soft lens analyzer, and the use of a water cell.
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