THE EFFECT OF LENS AGE ON THE PHYSICAL PROPERTIES OF A HYDROGEL CONTACT LENS MATERIAL

Title THE EFFECT OF LENS AGE ON THE PHYSICAL PROPERTIES OF A HYDROGEL CONTACT LENS MATERIAL
Author, Co-Author Ian Davies, Jotinderpal Sidhu, Satvinderpal Sidhu
Topic
Year
1992
Day
Sunday
Program Number
Poster 3
Room
Great Hall
Affiliation
Abstract The purpose of this study was to investigate what, if any effect lens age had on the physical properties of a hydrogel contact lens material. Ten subjects were fitted with 70% water content Lidofilcon A lenses and followed up for a six month period. Identically-powered control lenses were kept in saline over the trial period. After six months the lenses were retrieved from the subjects, sectioned and tested on the Hounsfield H 5000M Universal tensometer. The results showed a significant decrease in both elastic modulus and the tensile strength of the test vs control lenses. This suggests a reduction in material strength over time brought about a change in the chemical properties of the material. This is the first time that such a change has been demonstrated, future work should look at material changes over shorter time periods to examine the rate of change. Study carried out at Allergan - not funded by Company.
Affiliation of Co-Authors
Outline