Compressive behaviour of soft contact lenses and its effect on refractive power on the eye and handling off the eye.

ABSTRACT:

Purpose

To investigate the stress-strain behaviour of 9 soft contact lens materials, that are commonly used in the market, under uniaxial compression loading.

Methods

Seven types of hydrogel and two types of silicone-hydrogel soft contact lens materials were hydrated in phosphate-buffered saline (PBS) solution then subjected to uniaxial compression loads. The load rate was set to 16.0 N/min starting with two consecutive initial 5.0 N loading cycles followed by three relaxation periods of 4.0 min within which there were two more 5.0 N loading cycles and eventually, a full loading cycle that stopped at a load of 49.0 N. The load and contraction data obtained experimentally were analysed to derive the stress-strain behaviour. Finite Element (FE) analysis was then utilised to ev

SUBMITTER: Shihab AH 

PROVIDER: S-EPMC7895393 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature