Measurement of corneal topography through Hartmann-Shack wave-front sensor

Jinsheng Yang; Xuejun Rao; Changhui Rao

doi:10.1117/12.806170

2 February 2009 Measurement of corneal topography through Hartmann-Shack wave-front sensor

Jinsheng Yang, Xuejun Rao, Changhui Rao

Proceedings Volume 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications; 71601K (2009) https://doi.org/10.1117/12.806170
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

A corneal topography based on Hartmann-Shack Sensor is presented in this paper. In the system, the focus of an objective lens is precisely positioned on cornea's curve center. Wave-front of the reflecting beam can be measured by the Hartmann-Shack sensor which is conjugate to the cornea plane. If the corneal surface is a perfect sphere, wave-front detected by the Hartmann-Shack sensor is a plane. As a result, data measured by Hartmann-Shacks sensor is the deviation between the sphere and the real cornea surface. This paper describes a methodology for designing instrument based on Hartmann-Shack sensor. Then, applying this method, an instrument is developed for accurate measurement of corneal topography. In addition, measuring principle of Hartmann-Shack sensor which determined system parameters is also introduced. Repeatability is demonstrated by a series of data. The instrument was able to accurately measure simulative cornea's reflective aberrations, from which corneal topography and corneal refractive aberrations were derived.

Citation Download Citation

Jinsheng Yang, Xuejun Rao, and Changhui Rao "Measurement of corneal topography through Hartmann-Shack wave-front sensor", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71601K (2 February 2009); https://doi.org/10.1117/12.806170

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