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Biomedical subjects

J T Wing

Publications and source records attributed to J T Wing.

4 recordsLinked to original sources
PubMed1994

Hematologic disorders.

Hematology is the study of the cellular elements of blood. Essentially all diseases affect blood components and compromise their important functions, which include transport of nutrients and wastes, cellular defenses, and clot formation. When the disease process manifests itself in the eye, the optometrist should make every effort to determine an underlying cause. This chapter attempts to provide a basic understanding of laboratory tests evaluating hematologic function and to develop a diagnostic approach toward this group of disorders.

Eye Diseases↗
PubMed1990

Auxiliary lenses in fundus biomicroscopy--a comparison of fields of view.

The use of the biomicroscope in fundus examination requires an auxiliary lens to overcome the high focal convergence of the eye. This study presents the results of subjective field of view determinations with a variety of auxiliary biomicroscopy lenses. Direct/mirror view Goldmann type contact lenses demonstrated the smallest field in the range of 25-30 degrees. Indirect view pre-corneal condensing lenses were about twice this amount in their field. Wide field indirect view lenses with contact lens elements (Rodenstock Panfunduscope, Mainster retinal lens, Volk Quadraspheric) range between 85 and 125 degrees d of field. The use of each type of lens in routine and specialized examination of the fundus as well as in photocoagulation are discussed.

Fundus Oculi↗
PubMed1990

Ultra wide field fundus biomicroscopy with the Volk Quadraspheric lens.

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.

Evaluation Studies as Topic↗