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July 1970

Wide Angle Fundus Contact Lens

Author Affiliations

Montreal; Toronto
From the departments of ophthalmology, St. Mary's Hospital, Montreal (Dr. Schirmer), and St. Michael's Hospital, Toronto (Dr. Shea).

Arch Ophthalmol. 1970;84(1):66. doi:10.1001/archopht.1970.00990040068017

MODERN slit lamps permit every ophthalmologist to examine the fundus with a Hruby lens1 or Goldmann's plano concave contact lens.2 The fundus area surveyed is only a few disc diameters large. Orientation improves only with an increase of field which is one particular attraction of indirect ophthalmoscopy. It would seem superfluous to attempt the same with biomicroscopy were it not for turbid media, especially blood or exudate in the vitreous. In this instance, the Tyndall phenomenon of a strong coaxial beam obscures the target area. Lateral or illumination from below with a slit lamp beam, however, illuminates this point of regard without interference. Wide angle contact lenses deserve attention for this particular reason, notwithstanding the upright imagery and good magnification with stereopsis.3,4

This particular contact lens (J. Marie, Canadian Contact Lens Laboratories, Montreal) permits a wide angle view of the fundus because of a concave front surface

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