Aldhafeeri, Raed
(2015)
Stress Analysis for Scleral Buckling of the Eye.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Scleral buckling is a process in which a buckle or band is wrapped around the eye and tightened and is used to treat different eye disorders. The procedure can result in induced myopia by increasing the axial length of the human eye. This study was performed to assess how the application of a scleral buckle of various widths and tightness on eyes with decreased corneal thicknesses affects stresses and strains in the tissue and the anterior-posterior dimension. For this purpose, an axisymmetric finite element model of the eye was created where the mechanical properties of the tissues are assumed to be linearly elastic, the humors as incompressible fluid and the buckle as rigid. The buckles were chosen to have widths of 3, 5 and 7 mm with constrictions of 0.5, 1 and 1.5 mm and the reduced thicknesses of the cornea that were considered are 0, 25 and 50%. The results showed that as the buckle width and tightness increase, the axial length change of the eye increases. The maximum stress is greater for a thinner buckle with greater tightness. Also, the change in corneal thickness has a minor effect on the axial length and maximum stress. For scleral buckle selection, increased buckle width and construction lead to an increase in myopia. Eyes which have thinner cornea due to disease or LASIK procedure for example are more susceptible to this myopic shift than eyes with a normal corneal thickness.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
11 September 2015 |
| Date Type: |
Publication |
| Defense Date: |
15 July 2015 |
| Approval Date: |
11 September 2015 |
| Submission Date: |
23 July 2015 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
30 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
STRESS ANALYSIS, SCLERAL BUCKLING, CORNEA THINING, FINITE ELEMENT ANALYSIS,BIOMECHANICAL MODEL |
| Date Deposited: |
11 Sep 2015 13:46 |
| Last Modified: |
15 Nov 2016 14:29 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/25752 |
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