Survey of Ophthalmology
Volume 43, Issue 1 , Pages 71-82, July 1998

Determining the Vertical and Horizontal Positioning of Multifocal and Progressive Lenses

  • Frank Kozol, OD, FAAO

      Affiliations

    • Department of Vision Science, East Boston Neighborhood Health Center, Department of External Clinics, The New England College of Optometry, Boston, MA USA
    • ,
  • Robert C. Capone, OD, FAAO

      Affiliations

    • Eye Services, East Boston Neighborhood Health Center, Department of External Clinics, The New England College of Optometry, Boston, MA USA
    • ,
  • Neil D. Kozol, OD

      Affiliations

    • Eye Services Department, Bridgewater Goddard Park Medical Associates, Inc., Brockton, MA, USA

MELVIN RUBIN, EDITOR

Abstract 

The key to success with any ophthalmic spectacle prescription is not only the accurate determination of the refractive prescription, but the proper selection and fitting of the ophthalmic frame and lenses. Proper selection and fitting are especially important with bifocals, trifocals, or progressive lenses, which present many variables other than inaccurate interpupillary distance measurement that can lead to patient dissatisfaction. This article discusses fitting procedures for patients with new or existing multifocals. It reviews how to determine proper multifocal segment heights; and calculate distant decentration, inset, and total inset measurements; and it addresses issues involving variations in frame size and patient temperament.

Keywords:  bifocal, decentration, inset, progressive addition lenses, segment, segment drop, segment height, total inset, trifocal

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PII: S0039-6257(98)00013-7

Survey of Ophthalmology
Volume 43, Issue 1 , Pages 71-82, July 1998

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