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Related Experiment Videos

Slab-off prisms.

N R Garber, T Kirdulis

    Journal of Ophthalmic Nursing & Technology
    |July 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Three slab-off prism grinding techniques exist for correcting vertical diplopia. Front surface and bicentric methods create base-up prism, while reverse slab-off yields base-down prism. This prism correction is best for stable deviations.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Optical Engineering

    Background:

    • Slab-off prism is a specialized lens grinding technique.
    • It is used to correct vertical diplopia, particularly in the reading position.
    • Understanding different grinding methods is crucial for effective prism application.

    Purpose of the Study:

    • To outline the primary grinding techniques for slab-off prism.
    • To describe the prismatic effect produced by each technique.
    • To discuss the clinical application and considerations for slab-off prism use.

    Main Methods:

    • Identification of three distinct slab-off prism grinding techniques: front surface slab-off, bicentric grinding, and reverse slab-off.
    • Analysis of the resultant prism base direction (base-up or base-down) in the inferior lens portion for each method.

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  • Review of the clinical indications and cost-effectiveness for prescribing slab-off prism.

    • Main Results:

    • Front surface slab-off and bicentric grinding produce base-up prism in the lower lens section.
    • Reverse slab-off grinding results in base-down prism in the inferior lens portion.
    • Slab-off prism is indicated for stable vertical deviations causing diplopia during reading.

    Conclusions:

    • The choice of slab-off grinding technique dictates the direction of the induced prism.
    • Slab-off prism is an effective treatment for specific cases of vertical diplopia.
    • The cost and necessity for stable deviations should guide the prescription of slab-off prism glasses.