Investigation ofOptical Eye Power Function under Capsule Properties

The gradual changes of the capsule geometry and material properties with age and its importantrole in the design of intraocular lens implants were the motivation of extensive researches ondescribing the capsule biomechanical behavior. The present work aimed to study the lensaccommodation response to different capsule thickness and material properties at different ages.A material and geometry parametric study was performed, drawing some guidelines on thechoice of lens capsule thickness and biaxial/uniaxial elastic material parameters, and exploringthe response sensitivity of the finite element model at different age groups. The ۱۶ and ۴۸-yearold lenses were considered for lens accommodation simulation. The sensitivity of lensaccommodation was studied at each age group by considering constant thickness (cnst-t) andvariable thickness (var-t) capsules, and biaxial (Biax) and uniaxial (Uniax) materialcharacteristics tests. The lens was stretched through zonules, and corresponding absolute changesin central optical power (COP) were measured.The ۱۶-year lens model was more sensitive tomaterial properties than thickness variation, while thickness variation was more relevant toΔCOP of the ۴۸-year lens model. The ۴۸-year model had the least sensitivity to capsule thicknessand material property variations

Keywords:

Human lens capsule , Accommodation , Strain , Finite Element Analysis.