Corneal topography with conical null-screen for non-symmetric aspheric corneas
| Autor: | José Rufino Díaz-Uribe, Manuel Campos-García, Cesar Cossio-Guerrero, Victor de Emanuel Armengol-Cruz, Arturo I. Osorio-Infante |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Surface (mathematics)
Physics Corneal topographer medicine.diagnostic_test Null (radio) business.industry Physics::Medical Physics Non symmetric Rotational symmetry Conical surface Deformation (meteorology) Corneal topography 01 natural sciences 010309 optics Optics 0103 physical sciences medicine business |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2237372 |
| Popis: | In this work, we will present some improvements to the conical null-screen based corneal topographer, for testing aspheric surfaces without rotational symmetry. We present the formulae to design the conical null-screen in such a way that the image on the CCD is a perfect array of spots; departures from this geometry are due to deformation or misalignment of the surface. Additionally, we will explain how to improve the algorithms to find the normals of corneal surface. Finally, we will evaluate the topography of a spherical surface. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|