RT Journal Article
SR Electronic
T1 Age related compliance of the lamina cribrosa in human eyes
JF British Journal of Ophthalmology
JO Br J Ophthalmol
FD BMJ Publishing Group Ltd.
SP 318
OP 323
DO 10.1136/bjo.84.3.318
VO 84
IS 3
A1 Julie Albon
A1 Peter P Purslow
A1 Wojciech S S Karwatowski
A1 David L Easty
YR 2000
UL http://bjo.bmj.com/content/84/3/318.abstract
AB AIMS To investigate changes in the mechanical compliance of ex vivo human lamina cribrosa with age. METHODS A laser scanning confocal microscope was used to image the surface of the fluorescently labelled lamina cribrosa in cadaver eyes. A method was developed to determine changes in the volume and strain of the lamina cribrosa created by increases in pressure. The ability of the lamina cribrosa to reverse its deformation on removal of pressure was also measured. RESULTS Volume and strain measurements both demonstrated that the lamina cribrosa increased in stiffness with age and the level of pressure applied. The ability of the lamina cribrosa to regain its original shape and size on removal of pressure appeared to decrease with age, demonstrating an age related decrease in resilience of the lamina cribrosa. CONCLUSIONS The mechanical compliance of the human lamina cribrosa decreased with age. Misalignment of compliant cribriform plates in a young eye may exert a lesser stress on nerve axons, than that exerted by the rigid plates of an elderly lamina cribrosa. The resilience of the lamina cribrosa also decreased with age, suggesting an increased susceptibility to plastic flow and permanent deformation. Such changes may be of importance in the explanation of age related optic neuropathy in primary open angle glaucoma.