WHO:	Karen Hampson , Imperial College, UK
TOPIC:	The higher-order aberrations of the human eye: relation to the pulse, entrainment, and the relevance to the accommodation response
ABSTRACT:	Adaptive optics (AO) is becoming an increasingly popular technique to investigate the human visual system such as the possible role of the higher-order aberrations in the accommodation response. Firstly this talk will outline the design considerations and performance of a system constructed at Imperial College. Then results will be presented on three main experiments carried out using the system. The higher-order aberrations of the human eye are known to fluctuate over relatively short time periods but the origin of the fluctuations has not been determined with certainty. The first set of experiments was to determine if the heartbeat is a possible cause. The aberrations and pressure pulse wave were simultaneously measured for five subjects. Coherence function analysis was used to assess the correlations. Frequency entrainment is when an oscillation at one frequency in a system causes another oscillation at a close frequency to be pulled until eventually both oscillate at the same frequency. An example of this is brain wave entrainment via a light source stimulus with certain properties. The second set of experiments involved investigating if the fluctuations in the higher-order aberrations and accommodation could be entrained to certain frequencies governed by the mirror. The final experiments discussed are those in which the possible role of the higher-order aberrations in the accommodation response was investigated. These experiments involved selectively implementing or correcting certain aberrations.
WHEN:	1/12/2004 12:00:00 PM
WHERE:	Meliora 269

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