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

David L. Guyton

doi:10.1097/00006324-198210000-00006

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

David L. Guyton

School of Medicine

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

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 language	English (US)
Pages (from-to)	800-814
Number of pages	15
Journal	Optometry and Vision Science
Volume	59
Issue number	10
DOIs	https://doi.org/10.1097/00006324-198210000-00006
State	Published - Oct 1982

Keywords

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

ASJC Scopus subject areas

Ophthalmology
Optometry

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10.1097/00006324-198210000-00006

Cite this

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AB - 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.

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KW - Cross cylinder

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KW - Subjective refraction

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

Abstract

Keywords

ASJC Scopus subject areas

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