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    Course Description

    Principles of Contact Lesnes

    are many reasons why a contact lens prescription can differ significantly
    from a spectacle prescription belonging to the same patient. By studying
    the principl
    of optics which need to be considered when fitting rigid and soft lenses,
    many of these reasons will be explained.

    start with a review
    of the anatomical features of the human eye with a special emphasis
    on the tear film and the cornea. This will be followed by proper patient
    selection through the use of appropriate pre-fit testing and interviewing
    techniques. An attempt will be made to identify those contact lens candidates
    with the best prognosis as well as those with a reduced prognosis for
    successful fitting.

    this is a discussion of vertex distance compensation, a subject which
    assumes added importance when fitting contact lenses. A prescription
    in excess of ±4.00D at the spectacle plane must be compensated for contact
    lenses which are fit at the corneal plane. When a rigid contact lens
    is placed on the cornea, a tear layer is formed between the back surface
    of the lens and the front surface of the cornea. This liquid or lacrimal
    lens can sometimes assume the shape and power of a plus or minus lens.
    The added power must then be considered when determining the final power
    of the contact lens. Examples and practice exercises are presented to
    cover instances of rigid lenses fit on K, steeper than K and flatter
    than K