Question Prism Correction for Dive Masks?

[tursiops]

I have developed strabisbus, my eyes do not point in quite the same directions...one points down relative to the other. Double vision is the result. This is correctible in glasses with a "prism" correction, basically a wedge that bends the light in one direction. This is usually done by taking the measured amount of correction needed (in my case 6 diopters) and putting half in one lens (3) and half (of the opposite sign) in the other eye...so two corrective lenses are needed. This can be done with ground lenses, or stick-on Fresnel lenses. Has anyone used a prism correction in their dive mask, either ground or with stick-on Fresnel lenses?

 

[Jenmutt]

Any chance you were able to find a make with prism correction included with the prescription?

 

[tursiops]

Any chance you were able to find a make with prism correction included with the prescription?

SeaVision says they can do it, at least for certain masks and my prescription.
I tried stick-on Fresnel lenses and they were not satisfactory. I saw better without them!

 

[tursiops]

Google is your friend. You do not want Fresnel prisms as mentioned in the Op. They are thin, because they're composed of many tiny individual prisms that have an additive effect, they are manufactured on a translucent media that is designed to stick to an eyeglass lens, and due to the composition and demarcations between the individual prisms, the vision is severely degraded. Or to trial the patient to determine the minimum amount of prism to enable them to fuse the image with both eyes. They are intended for temporary use only such as following a stroke while the patient is being rehabilitated and the strabismus is (hopefully) temporary, or when the required prism correction is so great it's not possible to fabricate an eyeglass prescription to accommodate the required amount.

Prism Lenses for Dive Masks

Do you wear glasses with prism? Interested in finding out if prism lenses can be made for dive masks and swim goggles? See the Sea RX’s state of the art ...

seethesearx.com

$384. Just a tad expensive....

 

[tursiops]

No surprise. You should have asked me first.

That is what the OP was. Sorry you missed it.

 

[tursiops]

I didn't miss anything.

I'm sorry you didn't do your homework first and wasted time and money on worthless Fresnel prisms that are not designed for the purpose in which you attempted to use them.

I do not understand. Fresnel prisms are routinely used by OD's to see if they work for strabimus before you spend the money on ground lenses.

 

[tursiops]

Exactly right. One of the two main purposes of Fresnel lenses is to trial the patient prior to ordering expensive ground prescription lenses.

You said you "tried them and they didn't work". I figured- and please correct me if I was mistaken- that you you applied them to your dive mask and not surprisingly found them to be a waste of time, effort and money for the reasons detailed in my earlier post on this thread.

I of course appreciate your input. It is unfortunate that it conflicts with that of my ophthalmologist and my optometrist, who both suggested I might try them before spending the real money. It was not an expensive test.
When I said they "didn't work," I meant not as a permanent solution. They indeed corrected the double-vision, but of course degraded the vision otherwise. the test (in my mind) was how much vision degradation would I get and was it tolerable. It was not,.
As to not having not done my research....my OP was part of that, along with much googling and other web-searching, and discussions with my eye-doctors.
I'm curious; how would I have "asked you first" other than the OP? I assume you have some credentials (or at least special knowledge) in this subject; how would I know that?

 

[tursiops]

I have sufficient galucoma in my non-dominant eye that I can function without the prism correction; what the brain sees from that eye is used for depth perception, mostly. My photography -- using a dominate eye viewfinder -- is unimpeded. It is working out OK. Sure, I'd love everything to be perfect, but the double-vision is the least of it, and I correct for it only when driving and reading.
Thanks for your input.

 

[happy-diver]

Sorry chief hang in there