On-eye dehydration of proclear, resolution 55G and acuvue contact lenses.
In order to compare the extent of dehydration of Proclear, Resolution 55G and Acuvue contact lenses overtime, 13 patients wore each lens during 4, 6 and 8 h. Three observers, initially shown to have a high inter-observer reliability, measured water content, with a soft contact lens refractometer before and after each period of wear. Absolute dehydration of Proclear and Resolution 55G lenses were similar after 4, 6 and 8 h of wear, but were smaller than for Acuvue lenses (1.2% compared to 5.7% after 8 h). The loss of lens mass following dehydration of Resolution 55G lenses, calculated with the change in lens relative water content was found to correlate very well with an in vitro study of the same material. Lens dehydration should be taken into account by clinicians when making their choice of soft contact lens.
Quesnel
N M
NM
Ecole d'optométrie, Université de Montreal, succursale Centreville, Canada. quesneln@opto.umontreal.ca
Giasson
C J
CJ