Inverse Hartmann test for radius of curvature measurement in a corneal topography calibration sphere

In this article, the use of a square Hartmann screen test to measure the radius of curvature of a corneal topography calibration test sphere is presented. The proposed technique is based on the image formation principle by specular reflection on convex reflective surfaces. Applying an inverse Hartma...

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Bibliographic Details
Published in:Review of scientific instruments 2022-04, Vol.93 (4), p.043101-043101
Main Authors: Jalife-Chavira, J. M., Trujillo-Schiaffino, G., Mendoza-Villegas, P. G., Salas-Peimbert, D. P., Anguiano-Morales, M., Corral-Martínez, L. F., Tornero-Martínez, N.
Format: Article
Language:English
Subjects:
Calibration
Cornea
Corneal Topography - methods
Radius
Radius of curvature
Scientific apparatus & instruments
Specular reflection
Topography
Upper Extremity
Wave front reconstruction
Wave fronts
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Summary:In this article, the use of a square Hartmann screen test to measure the radius of curvature of a corneal topography calibration test sphere is presented. The proposed technique is based on the image formation principle by specular reflection on convex reflective surfaces. Applying an inverse Hartmann test, a de-magnified virtual image (Hartmanngram) is obtained; considering their own scaled reference screen plate, a zonal wavefront retrieval approach is used and the radius of curvature obtained. Experimental setup along the obtained results is presented. A simulated spherical wavefront is used as a method to evaluate the error in the wavefront reconstruction. Since the measurements of radius of curvature fits in to ISO 10343, through suitable modifications the proposed method is potentially applicable in small F/# convex specular surfaces, as is the case in keratometry and corneal topography measurements.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0080572