How does the Canon Anti-Fog Eyepiece work

How does the Canon Anti-Fog Eyepiece work?:
" since the issue of how the technology works has come up a couple of times here a quote from the EOS 3 brochure description of it.
The new anti-fog technology developed by Canon uses a thin water-absorbent polymer coating. This polymer coating is placed on glass surfaces where it prevents fogging by absorbing moisture.
The coating consists of an organic polymer which absorbs moisture and an inorgamic polymer which stabilizes the coating. When this coating is physically stable it can prevent fogging on glass surfaces. The polymer coating also allows the moisture to evaporate naturally.
The cycle of moisture absorption and evaporation is repetitive and the polymer coating can thereby remain effective for a long time.The polymer coating will lose its effectiveness if it already contains moisture. Careful handling is required. The Anti-fog Eyepiece should never be touched unless it is dry."