PAR CORNEAL TOPOGRAPHY SYSTEM (PAR CTS) - THE CLINICAL-APPLICATION OF CLOSE-RANGE PHOTOGRAMMETRY

被引：20

作者：

BELIN, MW

CAMBIER, JL

NABORS, JR

RATLIFF, CD

机构：

[1] Division of Cornea, External Disease and Refractive Surgery, Lions Eye Institute, Albany Medical College, Stratton Veterans Administration Medical Center Surgical Service, Division of Ophthalmology, Albany, NY

[2] PAR Microsystems Inc., PAR Vision Systems Corp, New Hartford, NY

[3] Division of Cornea, External Disease and Refractive Surgery, Lions Eye Institute, Albany Medical College, Albany, NY

来源：

OPTOMETRY AND VISION SCIENCE | 1995年 / 72卷 / 11期

关键词：

TOPOGRAPHY; PHOTOGRAMMETRY; RASTERPHOTOGRAMMETRY; STEREOGRAMMETRY; TRIANGULATION; VIDEOKERATOSCOPES; PLACIDO; STRUCTURED LIGHTING; FLUORESCENCE; ELEVATION; TANGENTIAL; KERATOCONUS; FORME FRUSTE KERATOCONUS; PHOTOREFRACTIVE;

D O I：

10.1097/00006324-199511000-00009

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

The PAR Corneal Topography System (CTS) is a computer-driven corneal imaging system which uses close-range photogrammetry (rasterphotogrammetry) to measure and produce a topographic map of the corneal surface. The PAR CTS makes direct point-by-point measurements of surface elevation using a stereo-triangulation technique. The CTS uses a grid pattern composed of horizontal and vertical lines spaced about 0.2 mm (200 mu m) apart. Each grid intersection comprises a surface feature which can be located in multiple images and used to generate an (x,y,z) coordinate. Unlike placido disc-based videokeratoscopes, the PAR CTS requires neither a smooth reflective surface nor precise spatial alignment for accurate imaging. In addition to surface elevation, the PAR CTS computes axial and tangential curvatures and refractive power. Difference maps are available in all curvatures, refractive power, and in absolute elevation.

引用

页码：828 / 837

页数：10

共 16 条

[1]

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[2]

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[3]

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[4]

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[5]

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[6]

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[7]

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[8]

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[9]

El Hage S.G., A computerized corneal topographer for use in refractive surgery, Refract Corneal Surg, 5, pp. 418-423, (1989)

[10]

Mandell R.B., The enigma of the corneal contour, CLAO J, 18, pp. 267-273, (1992)

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