Again, everyone here is making assumptions. here's the quote right from the CIBA website in regards to the difference.

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AIR OPTIX® AQUA contact lenses were introduced in 2008 as an upgrade to O2OPTIX® contact lenses.

With the AQUA Moisture System, AIR OPTIX® AQUA lenses provide moisture for comfort on contact, all day, every day. They’re so comfortable that from the moment you put them in you may hardly notice them.
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Now answer the following after reading the above:

1. IS there ANYTHING that SPECIFICALLY states what the upgrade to the O2 Optix is?

2. When it states that the "Aqua Moisture System" exists, does it anywhere in the writeup say that it is specific to Aqua Optix lenses only, that this was an all new ingredient that they came up with? Does it state ANYWHERE that it's a proprietory and unique solution that comes only with the more expensive lenses? Or are you making the assumption the marketer wants you to make?

3. If it is an proprietary ingredient that is included ONLY in the Aqua's, as in not in the O2's, wouldn't they specify that?

What I am telling you, as a marketing professional of many MANY years, is that there is no difference. The insert is the same, the insert states the lenses are the same, the external packaging of the lenses is the same, and there is nothing but "creative marketing' to separate the two. The only time that O2 Optix were EVER called 2 week lenses was when the FDA allowed Silicon Hydragel's to be only used for 2 weeks.

Just read the information and come up with some "black and white" confirmation that the lenses or the solution they are soaked in is different. Don't tell me, SHOW ME.