It has been observed that contact lens solution often
evaporates overnight. The evaporation of contact lens solution occurs due to
many underlying reasons. Keep in mind that contact lenses are inclined to suck
up the contact lens solution when they are soaked in it. Contact lenses with higher water content tend
to absorb the solution in larger quantity.
Climatic factors are the reason behind the evaporation. The
partial evaporation of the disinfectant in the contact lens case unfortunately
reduces the disinfecting ability of the contact lens solution. The preservative
in the solution that works to disinfect contact lenses evaporate when the
contact lens case is opened. Therefore; we can say that the evaporation of
contact lens solution is actually the evaporation of the
preservative that kills the bacteria. This explains that why one
should not top off contact lens solution.
According to the research study by AMO that was conducted to
judge the concentration of various branded disinfectants upon partial
evaporation reveals that:
- ReNu with MoistureLoc (Bausch + Lomb) lost 75 to 99 percent of its ability to kill Fusarium fungi, 90 to 100 percent of its effectiveness against Candida fungi, and 29 to 33 percent of its effectiveness against Acanthamoeba microorganisms.
- Opti-Free Replenish (Alcon) lost 72 to 90 percent of its disinfecting efficacy against Fusarium and Candida fungi, and 10 to 61 percent of its effectiveness against Acanthamoeba.
- ReNuMultiPlus (Bausch + Lomb) lost 79 percent of its effectiveness against Candida fungi (when the solution was evaporated to four times its normal concentration).
- AQuify Multi-Purpose (Ciba Vision) lost 34.5 percent of its effectiveness against Candida fungi (4x concentration).
- Biotrue (Bausch + Lomb) lost 48 percent of its effectiveness against Candida fungi (4x concentration).
- Complete RevitaLens (Abbott Medical Optics) showed no loss in disinfecting effectiveness for the microorganisms tested.
Always
keep the disinfectant bottle tightly capped and do not keep it open for long.
Also do not touch the nozzle or tip of the solution bottle since the
inoculation & evaporation both affect the concentration of the solution
negatively. The study data proves that only AMO contact lens solution retains the efficacy even after partial evaporation.
The study was published
online by Contact Lens & Anterior Eye (Journal of the British Contact Lens
Association) on March 10, 2011.
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