Glasses prescriptio...
 

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[Closed] Glasses prescription help please.

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Mrs Zip needs a lens for her diving mask.

She wants long distance.

What numbers from this are relevant?


 
Posted : 22/08/2018 10:57 am
Posts: 379
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I think its SPH, CYL & AXIS. The others are the corrections for vari/bi focals (I'm not an Optician, I just happen to have had a conversation with a lens manufacturer about this the other day!)


 
Posted : 22/08/2018 12:11 pm
Posts: 173
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That's actually quite a complex prescription and I would take advice from an optician before ordering anything.

The numbers you've shown suggest that your wife is long-sighted, not near-sighted, and therefore doesn't require correction for distance vision, however she does also have near-sighted astigmatism.

The SPH (sphere) is the "standard" short/long-sight correction. A positive number implies your wife is long-sighted, not short-sighted. The CYL (cylinder) is the astigmatism part.

Again, take advice!

Don't know anything about diving masks, but have recently looked into lenses for riding glasses and snowboard goggles pretty thoroughly and it's not quite as straightforward as just transferring over a glasses prescription.


 
Posted : 22/08/2018 6:13 pm
Posts: 5012
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If you want the closest or ‘best sphere’ order  R +1.50, L +1.25.

This should be fine for snorkelling and so forth, I don’t bother correcting my astigmatism in my mask.

However, for proper diving where you need to read dials and stuff to stay alive, you will need a bifocal, which ideally needs a proper dispenser, however a +2.00 add should work fine.

PM me if you want.

Edit, I’m an optician.


 
Posted : 23/08/2018 2:23 pm

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