The American optical SR-IV programmed subjective refractor: Principles of design and operation

Research output: Contribution to journalArticle

Abstract

The SR-IV refractor has a spherocylindrical optometer system which provides smoothly variable dioptric power of ±20.00 D sphere and ±8.00 D cylinder. A split-field monitoring system and joy stick permit three-dimensional alignment. A simultaneous-view cross cylinder system provides distortion-free side-by-side comparison of cross cylinder choices for cylinder axis and power refinement. Cross cylinder refinement incorporates automatic sphere compensation during cylinder power refinement and automatic selection of axis steps during axis refinement. A special astigmatic dial and ±0.50 D cross cylinders are provided for low vision refractions. Visual acuities are printed as well as the refined refractive findings at either spectacle or contact lens vertex distance.

Original languageEnglish (US)
Pages (from-to)800-814
Number of pages15
JournalOptometry and Vision Science
Volume59
Issue number10
DOIs
StatePublished - Oct 1982

Keywords

  • Astigmatism
  • Automated refraction
  • Cross cylinder
  • Microprocessor
  • Optometer
  • SR-IV
  • Subjective refraction

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry

Fingerprint Dive into the research topics of 'The American optical SR-IV programmed subjective refractor: Principles of design and operation'. Together they form a unique fingerprint.

  • Cite this