Preliminary results of a high-resolution refractometer using the Hartmann-Shack wave-front sensor - Part I
Arq. bras. oftalmol
;
66(3): 261-268, maio-jun. 2003. ilus
Artigo
em Inglês
| LILACS
| ID: lil-345652
ABSTRACT
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.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Optometria
/
Topografia da Córnea
/
Técnicas de Diagnóstico Oftalmológico
Idioma:
Inglês
Revista:
Arq. bras. oftalmol
Assunto da revista:
Oftalmologia
Ano de publicação:
2003
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Eyetec Equipamentos Oftálmicos Ltda/BR
/
Universidade Estadual de Maringá/BR
/
Universidade Federal de São Paulo/BR
/
Universidade de São Paulo/BR
Similares
MEDLINE
...
LILACS
LIS