Ultra wide field fundus biomicroscopy with the Volk Quadraspheric lens
Barker, F.M.; Wing, J.T.
Journal of the American Optometric Association 61(7): 573-575
1990
ISSN/ISBN: 0003-0244 PMID: 2380475 Document Number: 353832
Fundus biomicroscopy as a clinical technique has been enhanced significantly by the addition of indirect view condensing lenses. The combination of this type of lens with a corneal contact element allows higher power and better stability so that a wider field can be obtained. The Panfunduscope of Schlegel and the Mainster retinal lens are examples of this design that have been successfully applied to both examination and to pan-retinal photocoagulation. Volk has recently introduced a new aspheric design indirect contact lens system which is higher in power and provides a wider field of view (125 degrees) than previously obtainable. This article describes the optical properties and use of the Quadraspheric lens.
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