OPTOMETRY

Author: ARINES PIFERRER JUSTO.
Year: 2005.
University: SANTIAGO DE COMPOSTELA [www.usc.es].
Place of defense: ESCUELA UNIVERSITARIA DE ÓPTICA Y OPTOMETRÍA.
Place of preparation: FACULTAD DE FISICA.

Summary: Early detection of diseases affecting the posterior pole eye is of great significance for early diagnosis. In this area we have developed a chamber fund eye incorporating a wavefront sensor type Hartmann - Shack with the aim of employing the technique of deconvolution far behind compared to wave with partial compensation for imaging high spatial resolution the human retina in vivo. Much of the work done focuses on the study of Hartmann-Shack. So we analyzed the influence of the accused by umbralización in uncertainty associated wing determination from the center of the spots for the microlentes sensor. We have also studied the influence of the threshold in the estimation of the gradient local phase, noting the loss of purpose in the relationship between the centroid of the spot and gradietne of phase. We have also studied the importance of correct modeling both measures as front incident at the time of making the estimates of the coefficients manners. We have also studied the relationship between the coefficients estimates on two coordinate systems connected by a linear transformation of coordinates in order to decouple the process of modal estimate eye movements occurring during the process of measurement. Finally we looked like spread of modeling errors and measures to estimate the gradient of the optical transfer function. From the viewpoint of development of the device we have included the use of optical elements inducing aberrations of a liberal order in the process of calibration of the sensor head wave type Hartmann-Shack, noting the importance of this step in the calibration. As for the deconvolution process has shown the possibility of using the technique of deconvolution after measure of wavefront and partial compensation for obtaining high-resolution images of the fund eye as both experimentally through simulation with artificial eyes and eyes real. More still needs to be assessed the feasibility of using this technique in real time because of the increase in the SNR produced by the use of foil compensatory phase.

Author: QUEVEDO JUNYENT LUISA JESUS.
Year: 2006.
University: POLITÉCNICA DE CATALUÑA [www.upc.edu].
Place of defense: Sala dâAudicions de lâEUOOT â TR8.
Place of preparation: EUOOT, EDIFICI TR8 DESPATX 217 Campus TERRASSA.

Summary: The importance of vision in life is unquestionable. It is because of this that optometry, as a science of vision focused in measurement and analysis of visual function, has been developing techniques and instruments to evaluate its functionality in various contexts. Sport has become a social phenomenon, as evidenced by an increasing trend towards active participation, both professionally and recreationally. In order to enhance athletic performance, many have looked towards the sciences (medicine, biomechanics, psychology) for answers. With the specialization of sports vision, optometry has been particularly useful. The importance of the science of vision relating to sports is easily justified by considering that, in general, vision plays a dominant role in athletic success since the majority of external stimuli that athletes have to react to come through the visual system. One of the most critical areas that Sports Vision incorporates is the specific screening of visual capacities related to sports performance. If we consider the dynamic characteristics of most sporting modalities that generally involve constant environmental changes, sudden and fast movements of players and ball, speed, etc., we have to accept the premise that action sports require visual performance evaluation that is different from normal vision testing, since routine testing only samples static vision. Assessment of specific sports-related visual abilities includes peripheral vision, visual reaction time or dynamic visual acuity. In reference to the evaluation of dynamic visual acuity, defined as the ability to resolve a target under conditions of relative motion between the observer and the test stimulus, it must be noted that methods developed to date for its measurement have not been, in general, psychometrically validated, and are too cumbersome and unwieldy to find a place in clinical practice or in field situations.