Beam-deflection method of diagnosing impaired vision

Andreas Frohn, Wolfgang Fink, H. Burkhard Dick, Hans Jürgen Thiel

Research output: Contribution to journalArticlepeer-review


We describe a simple method to assign a diagnosis of cataract to patients with obscurely impaired vision as well as to those with mild lens opacities. When the narrowest slit is used in a slitlamp examination, a small beam of light appears on the macula. Routine fundoscopy with the 78.0 diopter lens or a 3-mirror glass is appropriate. If a cataract is present, the beam of light is scattered into several straight lines, distorted lines, or both. This has proved a useful diagnostic tool when the lens appears clear but the patient's vision is impaired, and extensive examinations such as computer tomography or nuclear magnetic resonance tomography for impaired vision may be avoided. The beam-deflection method uses devices that are generally available and can detect cataract in the early stages of development.

Original languageEnglish (US)
Pages (from-to)994-999
Number of pages6
JournalJournal of cataract and refractive surgery
Issue number7
StatePublished - 2001

ASJC Scopus subject areas

  • Surgery
  • Ophthalmology
  • Sensory Systems


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