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    Course Description

    Lens Alteration

    ability to carry out modifications of rigid contact lenses in the office
    provides benefits to the patient as well as to the contact lens practitioner.
    It enables the patient to continue their wearing schedule without interruption
    and minimizes the necessity for extra visits. Also, the practitioner
    may know best exactly which modification is required which may be difficult
    to describe to the laboratory. Any subsequent modifications become apparent
    and can be done immediately. Further, practitioners who carry out modifications
    are better able to evaluate lenses which have been made or which have
    to be modified by a laboratory.

    the adjustments that can be made to a lens have the effect of loosening
    the fit or increasing tear flow between the lens and cornea. Any adjustments
    required to tighten the fit of a lens necessitate the fabrication of
    a new lens.

    modification of rigid lenses may take the forms listed below.

    • reducing
      overall lens diameter

    • polishing and refinishing lens edges

    • power adjustments

    • polishing lens surfaces

    • blending transition or junction zones

    • adjusting peripheral curves

    • flattening intermediate curves
    • reducing
      optic zone diameter

    completion of this course, the participant should be able to:

    • Identify
      the materials and tools necessary to perform in-office modifications
      of rigid contact lenses.

    • Explain special care required when altering rigid contact lenses

    • Describe at least two techniques which can be used to reduce the diameter
      of a rigid contact lens.
    • Describe the instruments
      used to assess the diameter of a lens

    • Explain when and how to polish a rigid lens, modify its power and
      adjust the peripheral curves

    • Describe at least three methods of examining the edge of a lens

    • Describe an ideal contact lens edge

    • Identify the signs and symptoms associated with thick edges, square
      edges, sharp edges, rolled in and rolled out edges, and the office
      modification techniques used to make an improved edge.