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Updated: Jun 8, 2026

Automated Compression Testing of the Ocular Lens

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Published on: April 5, 2024

Null Ronchi-Hartmann test for a lens.

Maximino Avendaño-Alejo¹, Dulce González-Utrera, Naser Qureshi

¹Universidad Nacional Autónoma de México, Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Apdo. Postal 70-186, C. P. 04510, Distrito Federal, México. maximino.avendano@ccadet.unam.mx

|October 14, 2010

Summary

This study introduces a new method for designing Ronchi-Hartmann screens to precisely align fast plano-convex spherical lenses. The novel null screens ensure straight fringe patterns, simplifying lens testing and quality control.

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Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher

Published on: February 23, 2018

Area of Science:

Optical Engineering
Metrology
Lens Testing

Background:

Accurate alignment is critical for testing optical components, especially fast spherical lenses.
Traditional methods for lens alignment can be complex and time-consuming.
The caustic by refraction is a key optical phenomenon influencing lens aberrations.

Purpose of the Study:

To present a novel method for designing Ronchi-Hartmann screens.
To improve the alignment accuracy in testing fast plano-convex spherical lenses.
To introduce null screens that yield straight fringe patterns for simplified analysis.

Main Methods:

Designing null Ronchi-Hartmann screens based on the principles of caustic by refraction.
Utilizing the designed screens to observe fringe patterns during lens testing.
Developing a qualitative test for lens evaluation using the generated patterns.

Main Results:

Successfully designed null screens that produce aligned straight fringes.
Demonstrated improved alignment in the testing of fast plano-convex spherical lenses.
Validated the effectiveness of the null screens through a qualitative lens test.

Conclusions:

The presented method offers an effective approach to designing Ronchi-Hartmann screens for enhanced lens alignment.
Null screens based on caustic by refraction simplify the alignment process and improve testing accuracy.
This technique provides a valuable tool for optical engineers and metrologists in lens characterization.