Preliminary results of a high-resolution refractometer using the Hartmann-Shack wave-front sensor: part I

Arquivos Brasileiros de Oftalmologia

Luis Alberto Carvalho²  Antonio Carlos Romao²  Marcos Stefani²  Luiz Antonio Carvalho¹  Jarbas Caiado De Castro¹  Fátima Yasuoka¹  Francisco Scannavino Júnior¹  Juselino Dos Santos¹  Paulo Schor¹  Wallace Chamon¹ 

[1] ,Eyetec Equipamentos Oftálmicos LtdaSão Carlos SP

关键词: Corneal topography;    Ophthalmological diagnostic techniques;    Astigmatism;    Equipment design;    Optometry;    Retina;    Computer-assisted image processing;    Topografia da córnea;    Técnicas de diagnóstico oftalmológico;    Astigmatismo;    Desenho de equipamento;    Optometria;    Retina;    Processamento de imagem assistida por computador;   

DOI  :  10.1590/S0004-27492003000300002

来源: SciELO

【 摘 要 】

In this project we are developing an instrument for measuring the wave-front aberrations of the human eye using the Hartmann-Shack sensor. A laser source is directed towards the eye and its diffuse reflection at the retina generates an approximately spherical wave-front inside the eye. This wave-front travels through the different components of the eye (vitreous humor, lens, aqueous humor, and cornea) and then leaves the eye carrying information about the aberrations caused by these components. Outside the eye there is an optical system composed of an array of microlenses and a CCD camera. The wave-front hits the microlens array and forms a pattern of spots at the CCD plane. Image processing algorithms detect the center of mass of each spot and this information is used to calculate the exact wave-front surface using least squares approximation by Zernike polynomials. We describe here the details of the first phase of this project, i. e., the construction of the first generation of prototype instruments and preliminary results for an artificial eye calibrated with different ametropias, i. e., myopia, hyperopia and astigmatism.

【 授权许可】

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