fluid goggles

[steff]

Hi all,

I'm a newbie freediver, and am interested in the mechanics of fluid goggles. I've got a couple of questions that I was hoping someone could answer for me...
Why is a PCX (plano convex) lens used? Why not grind the (quite significant) power into the front and back surface of a lens? As I see it, you want to have fluid on either surface of the lens, not have a glass/glass interface. It wouldn't really make any difference to the mounting system either.

Also, why do you mount the lens on the inside surface of the goggles? Why not pop the lens out, and build a carrier system (like a lenticulated system), that would mean that you are cutting out 2 glass/water interfaces?

I know there has to be a reason for this, I must just be making it overly simplistic. I don't have a PhD in ophthalmic optics (however have done more than my fair share of this as I am an optometrist)

steff

 

[efattah]

As the inventor of the modern era fluid goggle, I can answer your questions:

1. DCX lenses have far too much spherical abberration
2. The water/air interface must be flat in order to see above the surface, therefore the lens must be mounted inside the goggle