Finite Element Modelling of Chiasmal Compression

Simon Trevor Thomas


There are a number of theories for the way chiasmal compression, from the growth of an abnormality such as a pituitary tumour, causes bitemporal hemianopia. In order to determine which theory is the most accurate, a greater understanding of the mechanism by which compression causes the loss of vision is needed. It has been proposed that the selective partial blindness, referred to in bitemporal hemianopia, is caused by a combination of the location of the optic nerves within the chiasm and the nature of crossing nerve geometry. The use of finite element modelling techniques to model the pressure present at various locations within the optic chiasm, and the pressure differential experienced by a crossing nerve as opposed to a non-crossing nerve has produced results supporting this theory. This thesis work will extend research previously conducted in an attempt to produce more accurate results through improving the geometry and accuracy of the material properties used in the modelling.


Finite Element Modelling, Optic Chiasm, Bitemporal Hemianopia

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