First debuted in 2015, the Type 5 is the first mechanical watch to be perfectly readable underwater regardless of the viewing angle. The Type 5N is designed with a “water drop” dial effect in order to achieve crystal-clear dial legibility for the wearer. To accomplish this, Ressence uses applied science. Because oil and glass share very similar responses to light refraction, the eye is tricked into momentarily losing its depth perception. The result is that the watch’s dial seems ever closer, vision of it apparently unimpeded by glass at all. The Type 5 builds upon that achievement by canceling out what is known as Total Internal Reflection. Typically, under water, a traditional diver’s watch needs to be viewed straight on in order to be read properly – otherwise refraction turns the glass into a mirror. The use of oil ensures complete legibility whatever the angle of view.
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