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$Subjective Refraction Test Using a Smartphone for Vision Screening$

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Interferometric quasi-absolute tests for aspherics using a radial shear position.

Klaus Mantel¹, Eduard Geist, Irina Harder

¹Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1/Bau 24, 91058 Erlangen, Germany. klaus.mantel@mpl.mpg.de

|October 20, 2009

Summary

This study introduces a new absolute testing method for aspheric surfaces, replacing the problematic cat's eye position with a radially sheared one. This advancement improves accuracy in aspheric metrology for precise surface deviation measurements.

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Area of Science:

Optical Engineering
Metrology
Surface Science

Background:

Growing demand for high-accuracy aspheric metrology.
Existing three-position tests for spheres have limitations when applied to aspherics, particularly the cat's eye position drawback.

Purpose of the Study:

To develop an absolute testing method for rotationally symmetric aspheric surfaces.
To overcome the limitations of the traditional three-position test for aspheric metrology.

Main Methods:

Proposed an absolute testing technique for aspheric surfaces.
Replaced the cat's eye position with a radially sheared position in the test setup.
Utilized rotational movements of the specimen for absolute surface deviation determination.

Main Results:

Successfully demonstrated an absolute testing procedure for aspheric surfaces.
Presented measurement results for a sphere using the novel method.
Compared the results with those obtained from the standard three-position test, validating the new approach.

Conclusions:

The proposed method offers a viable alternative for absolute testing of aspheric surfaces.
The radial shear technique effectively replaces the cat's eye position, enhancing metrology accuracy.
This method contributes to advancing precise surface characterization in optical manufacturing.