Prescription Mask

[InTheBlue]

I got my prescription dive mask from dive-vision.com and it has improved my whole experience and I can read my gauges properly now. They can correct an astigmatism as well.

 

[Marek K]

I've got extremely high negative correction (nearsightedness) -- about minus 10 diopters :shocked2:. With quite high astigmatism, and now significant presbyopia (reading correction).

I've never understood the argument that the water magnification phenomenon somehow means that you need less refractive correction. Larger and fuzzy is still...well...fuzzy.

I am extremely demanding regarding my vision (distance, astigmatism, and reading) for my normal glasses in air.

What's certain, though, is that optics underwater are quite different than in air. And I do agree that distance correction is much, much less critical underwater.

I dive with off-the-shelf spherical-correction lenses, and see perfectly underwater. To include reading my gauges. I tend to go to the exact or next-weaker available correction. Of course, my correction has long since stopped getting worse.

For what it's worth, my optometrist tells me that a difference of plus or minus .25 diopters is within the normal error variation when lenses are ground.

 

[InTheBlue]

Plenty of places do off the shelf prescription lenses for masks including Mares but if you want your exact prescription you have to go to a specialist.

The specialist also needs to be an eye doctor/optometrist/optician (depending on what country you come from).

Dive-Vision.com offer an excellent service and the technical director is a specialist sports qualified eyedoctor/optician.

 

[gajahduduk]

wake up old thread! So I have a prescription for scuba corrective lenses, with one eye being -2.75. The lenses come in .5 increments. According to Mike's Dive shop (random internet search):

As the dive mask prescription lenses come in 0.5 increments, the general rule is to scale down to the nearest number if you are short-sighted (minus lenses) or scale up to the nearest number if you are long-sighted (plus lenses).

What does "scale down" mean with negative numbers? -2.75 > -2.5 ? or > -3.0 ?? From the example context there it seems that would be -2.5. But wouldn't that be scaling up??

 

[SeaVisionUSA]

Scaling down from -2.50 would be -2.00. Think of it like a number line - Scaling down means closer to zero on the number line. Hope this helps & if you have any astigmatism, you should check us out! We make prescription lenses custom to your full Rx.

 

[SeaVisionUSA]

Scaling down from -2.50 would be -2.00. Think of it like a number line - Scaling down means closer to zero on the number line. Hope this helps & if you have any astigmatism, you should check us out! We make prescription lenses custom to your full Rx.

@gajahduduk oops, this was a reply to you!

 

[gajahduduk]

Scaling down from -2.50 would be -2.00. Think of it like a number line - Scaling down means closer to zero on the number line. Hope this helps & if you have any astigmatism, you should check us out! We make prescription lenses custom to your full Rx.

Thanks. So if my prescription is -2.75 I should get -2.5, correct?

Still seems to me that “scaling down” is the wrong term with negative numbers. Yes -2.5 is closer to 0 than -2.75, because -2.5 is greater. (-2.5 > -2.75). Seems that should be scaling up.

 

[ibj40]

Scaling down from -2.50 would be -2.00. Think of it like a number line - Scaling down means closer to zero on the number line. Hope this helps & if you have any astigmatism, you should check us out! We make prescription lenses custom to your full Rx.

SeaVision put my progressive prescription into my mask, and I couldn't be happier!