I'm a long time user of CSI daily wears, but as they as now discontinued in my prespecription I am now looking at the new lenses being used these days.
I find myself however, unable to "get" the distinction between the variations of silicone hydrogels that I see marketed for 2-week use and montly use. For example - in the UK at least - Ciba Focus Night and Day is primarily prescribed and used as a disposable lens. What then is the reason why there is also a Ciba O2 Optix Lens marketed for 2 week use?
I see that the Optix lens is a variation on the same material and with lower oxygen transmisisibity. So why bother, if most people are already using the Night and Day for the same purpose. Can any advatage be ascribed to the newer variation (02 Optix).
I'm just using these two lenses as an example, but I'm curious if anyone here can explain to me why the companies are marketing what seems to be more or less the same thing.
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