Desarrollo de un sistema de doble paso compacto y de bajo coste para la evaluación de la calidad óptica y la difusión intraocular

• Autores: Fernando Guillermo Sanabria Ortega
• Directores de la Tesis: Fernando Díaz Douton (dir. tes.), Jaume Pujol Ramo (dir. tes.)
• Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2015
• Idioma: español
• Tribunal Calificador de la Tesis: Luis A. Issolio (presid.), Meritxell Vilaseca Ricart (secret.), Sergio Oscar Luque (voc.)
• Materias:
  • Física
    • Óptica
  • Ciencias tecnológicas
    • Tecnología de la instrumentación
      • Instrumentos ópticos
• Enlaces
  • Tesis en acceso abierto en: TDX
• Resumen

  • The purpose of this PhD thesis was to design, implement and validate a low cost compact system based on the double-pass I technique in order to evaluate the viability of its use in the future in optical instrumentation to obtain optical quality and light diffusior estimations. First of all we measured the optical quality of an electro-optical liquid lens to prove its usefulness in the measurement of the eye's optical quality. We built a simple single-pass setup composed by a laser diode (LD), an electro-opticalliquid lens (EOLL) and a CCD as recording device. The results obtained in this study show the validity of this type of lenses for corrections of spherical refractive errors. In second place we studied the correction of spherical refractive errors in double-pass configurations by means of the electro­ optical liquid lens (EOLL). We measured the optical performance of the spherical corrector in terms of optical power, pupil size and optical quality verifying that they all fit the requirements to be applied to double-pass systems. We also evaluated the performance of the proposed method in patients by comparison with a conventional double-pass system using a Badal optometer (OQAS instrument) and we conclude that the EOLL is suitable to be used in a double-pass system for a spherical correction. In third place we implemented and validated a superluminiscent led (SLED) as light source in the double-pass system . The study showed that the SLED used during the experimentation did not have sufficiently low coherence to break the speckle noise on its own, but showed a good performance when being combined with other methods for speckle reduction. In fourth place we implemented and validated a CMOS camera as recorder device in the double-pass system. We studied the performance of a CMOS camera by comparison with the results obtained with a CCD. The study showed a high correlation between the results obtained with the CCD and CMOS camera, demonstrating in this manner suitability of this type of sensors (CMOS) for application in the field of visual optics. Taking into account the results on the light source, the spherical refractive error corrector, and the recording device, the final configuration of the system includes a SLD light source, a corrector based on EOLLs and a CMOS camera. The experimental double-pass system has been compared with a commercially available double-pass system (OQAS). All the tests showed the good agreement between both systems, which suggest that the system here presented may be used for estimations of the ocular optical quality and scattering measurements. We conclude that the proposed experimental setup, including as innovations the CMOS camera and the EOLL spherical corrector, improves in terms of size and cost a conventional system with a performance comparable to that observes in commercially available devices.