Journal of Clinical and Experimental Ophthalmology
Open Access
ISSN: 2155-9570
ISSN: 2155-9570
Marcelina Sobczak, M. Widlicka, P. Kurzynowski and A. Jozwik
Wrocław University of Science and Technology, Poland
Posters & Accepted Abstracts: Clin Exp Ophthalmol
The significance of ocular mechanics to optics of the eye has important implication for understanding the
dynamics of the eye that needs to maintain ocular image quality . Eye dynamics is controlled by intraocular
pressure (IOP) fluctuations associated with the ocular pulse,daily rhythm and pathological high levels of IOP
(glaucoma). These cause the corneal apex shift relative to the retina and the change of the axial corneal radius. This
study concerned on simulation of changes in corneal radius and the relative position of the cornea and crystalline
lens required for maintenance of the image quality (optical self-adjustment hypothesis) when the eye is subjected
to variations in IOP.
Methodology: Gullstrand-Le Grand Eye Model was assumed for analysis. The changes of the anterior chamber
depth (Î?D), the thickness of vitreous body (k.Î?D, k is a parameter) and corneal radius (Î?R) were analyzed and their
relations were calculated to fulfill the self-adjustment hypothesis (fig.1). The next step was to predict the relative
changes (isotropic) in the geometrical parameters of the eye depending on the different location of a neutral point
(stationary point during changes of IOP).
Results: The relation between RÎ?/Î?D and parameter k is linear (p<0.001). This relation allows for the prediction of
the relative changes in optical system to maintenance focus on the retina (optical self-adjustment of eye). The value
of k parameter depends on the location of the neutral point and the geometry of the eye.
Conclusions: The analysis showed that for measured Î?R/Î?D and parameter k, the linear equation could be used
for verification whether optical self-adjustment hypothesis is fulfil. It is the first approach to the description of the
dynamic of the optical system and it need be verify in the clinical study and simulated in advance numerical model
of the eye.
Marcelina K. Sobczak was born in Kalisz, Poland in 1993. She received an Engineer’s degree in Ocular Optics and a Master’s degree in Optometry from the Faculty of Fundamental Problems of Technology at Wroclaw University of Science and Technology. She is currently working toward a PhD degree in the same Faculty. Her early research revolved around design an optical system with dynamic magnification and an eye movements analysis in the process of tracking horizontal moving point.Her current research interests include a compensatory torsional eye movements analysis, an optical self-adjustment of the human eye and birefringent properties of a human cornea. First results of her research will be published in Journal of the Optical Society of America A.She is a member of the Visual Optics Group, SPIE and OSA Societies. She has experience in numerical analysis of images, especially in Matlab.
E-mail: marcelina.sobczak@pwr.edu.pl