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Summary
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.
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.
- 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.