Why do vintage dive watches have domed crystals?

Did it serve a function? Was it a manufacturing limitation? Just realized this is a question I need answered.

Probably the same reason ancient Romans used arches. I would think that the curve adds strength.

Good question.

It did serve a function. They were using acrylic crystals, which aren鈥檛 as strong as sapphire, so as the pressure increases, the weakest point of the Watch was the center of the crystal. By creating a dome the pressure was dispersed more evenly, allowing for greater WR without making the crystal thicker.

cornfedksboy

It did serve a function. They were using acrylic crystals, which aren鈥檛 as strong as sapphire, so as the pressure increases, the weakest point of the Watch was the center of the crystal. By creating a dome the pressure was dispersed more evenly, allowing for greater WR without making the crystal thicker.

Well this definitely makes sense. I guess that鈥檚 my answer. Thanks

To resist under water pressure

I have an Oris 65 diver with a massive dome crystal and when I go swimming it's actually better to read under water.