Agnieszka Boszczyk and Henryk Kasprzak
WrocÃ?Â?aw University of Science and Technology, Poland
ScientificTracks Abstracts: Insights in Ophthalmology
The value of intraocular pressure (IOP) is one of the most important parameter in diagnosis of glaucoma. IOP values are determined based on the response of the cornea to a deflection force. Like other biological tissues, the cornea exhibits distinct viscoelastic properties. However, type of this viscoelasticity is still not clear. Presumably, model of the corneal viscoelasticity and its specific parameters differ for individual cornea. Moreover, these values influence results of tonometric measurements. Interaction between the IOP and the biomechanical properties of anterior segment of the eye determines geometry of the cornea. Thus, there is a close relationship between biomechanical, geometrical and optical properties of the cornea, which has a direct impact on the quality of vision. Information about corneal biomechanical properties may be extracted in vivo from a dynamic deformation of the cornea, which occurs during air-puff measurement of IOP. Thanks to the Scheimpflug technology, non-contact Corvis ST tonometer allows to register sequences of images, which depict deforming horizontal corneal profiles with a speed over 4000 frames per second. The whole measurement takes 32 miliseconds and gives a sequence of 140 images. The study will present physical phenomena occuring during intraocular pressure measurements with air-puff tonometer Corvis ST, which includes: corneal indentations, corneal vibrations, retractions and rotations of the entire eyeball. These phenomena will be described and parameterized. The proposed parameters can potentially be used to describe the particular biomechanical properties of anterior segment of the eye. Understanding of processes of the corneal deformation and more detailed, quantitative description of these processes can be very useful in more advanced ophthalmic diagnostics.
Agnieszka Boszczyk prepares for defending her PhD in Physics at Wroclaw University of Science and Technology. She earned a BSc Degree in Technical Physics and an MSc Degree in Optometry. She is a Member of SPIE Student Chapters and SPIE Women in Optics. She is also a Manager of a grant Preludium 11 entitled, “Examination and numerical analysis of corneal deformation dynamics during intraocular pressure measurement with airpuff tonometer” founded by the National Science Center Polish.
E-mail: agnieszka.boszczyk@pwr.edu.pl