Measurement of the intraocular scattering using different instruments and parameters. Comparative study
[ANGLÈS] Intraocular scattering is the cause of most patient complaints that affect the normal daily activities when they have a cataract. This is the reason why it is important to evaluate when it is the right moment to perform cataract surgery. Nowadays, a variety of subjective methods for classif...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2099.1/16120 |
| Acceso en línea: | https://hdl.handle.net/2099.1/16120 |
| Access Level: | acceso abierto |
| Palabra clave: | Cataract Optical instruments Eye--Examination intraocular scattering optical quality of the eye double-pass technique dispersión intraocular calidad óptica del ojo técnica de doble paso catarata Cataractes Òptica--Aparells i instruments Ulls--Examen Àrees temàtiques de la UPC::Ciències de la visió::Optometria Àrees temàtiques de la UPC::Ciències de la visió::Instruments òptics i optomètrics |
| Sumario: | [ANGLÈS] Intraocular scattering is the cause of most patient complaints that affect the normal daily activities when they have a cataract. This is the reason why it is important to evaluate when it is the right moment to perform cataract surgery. Nowadays, a variety of subjective methods for classifying opacity, which can allow a somehow standardized procedure, are used by ophthalmologists to diagnose cataracts. Procedures commonly used for this purpose are the visual acuity test, the cataract gradation by means of direct observation of the crystalline lens through a slit lamp, and the Lens Opacity Classification System III (LOCS III). The goal of this study is to perform clinical measurements of intraocular scattering by means of different available commercial instruments that have become common in clinical practice. Specifically, the instruments to be compared will be the C-Quant system, which allows performing a subjective psychophysical assessment, and the OQAS, which is based on the double-pass technique and is totally objective. In this study we analyzed 78 patients with cataracts of different degree and type. The scattering results obtained by means of both instruments and parameters were compared by means of a statistical analysis. The results of the study show that both instruments are good predicting methods of the gradation of different types of cataracts in the clinical practice, although the OSI parameter has shown more statistically significant results. Nevertheless, future studies in this field should focus on a larger number of patients with cortical and subcapsular cataracts in order to find better conclusions. |
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