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Development of a Multi-Disciplinary Tool to Investigate Vision Loss due to Posterior Vitreous Detachment


The objective of this proposal is to develop a unique mechanics-based imaging methodology that allows multidisciplinary investigation of vitreous liquefaction and microscale vitreoretinal adhesion to elucidate mechanisms of vision loss from posterior vitreous detachment. Posterior vitreous detachment (PVD) occurs in 24% of all individuals by the age of 50-59 years and 87% of all individuals by the age of 80-89 years. In and of itself, complete detachment of the vitreous from the retina is a naturally occurring preventative mechanism for vision loss. Specifically, as the eye ages, the gel-like vitreous begins to liquefy (liquefaction). Concurrently, adhesion between the vitreous and retina weakens. The two well-timed age-related changes have chemical and mechanical components that work synergistically to cause the vitreous to cleanly and harmlessly separate from the retina. However, if liquefaction occurs early or adhesion is not sufficiently weakened, retinal tearing and/or detachment will occur, leading to vision loss. To date, the mechanisms of liquefaction and vitreoretinal adhesion are unknown. Therefore, there is no knowledge of why liquefaction occurs early or vitreoretinal adhesion weakening is delayed. Identification of the mechanisms involved in PVD will allow both processes to be manipulated such that they work in a cooperative rather than destructive manner, and to decrease the risk of vision loss. In this proposal, we will develop a testing apparatus to evaluate the microscale mechanical mechanisms of liquefaction and vitreoretinal adhesion. Specifically, we will use surface-modified magnetic microbeads to mechanically manipulate collagen fibers in the vitreous. During the manipulation, we will measure time-dependent changes in liquefaction, microadhesion forces at the vitreoretinal interface, and identify failure mechanisms between the vitreous and retina. Confocal reflectance and second harmonic generation will be used to image the manipulation of the collagen fibers in real-time.

Collaborators

BRITTANY COATS
College of Engineering
Mechanical Engineering
Project Owner

JOHN CONBOY
College of Science
Chemistry

Eileen Hwang
School of Medicine
Ophthalmology & Visual Science

Project Info

Funded Project Amount
$30K

Keywords
eye disease; biomechanics; second harmonic generation; micromechanics

Project Status
Funded 2020
Last Updated: 1/23/20