Spectacle lenses

I find the Zeiss lenses more "involving"; what I look at seems more "present". However, depth of field is better with the Pentax.

I have used the Zeiss very high refractive index glass with coating in my glasses for years.
The advantage is that they are more scratch reistant than plastic, and to my eyes seem much clearer as well. There is hardly any weight penalty.
The disadvantage is the cost, fragility if dropped, and danger if something hits you in the face while wearing them..

"What I fail to understand is why rimless glasses cost twice as much as ones with frames. There is no metal so why are you charged more?"

It's because they have to make them thinner as I understand.

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I find the Zeiss lenses more "involving"; what I look at seems more "present". However, depth of field is better with the Pentax.

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Zeiss are therefore flat earth glasses I reckon ?!

Cheese

I've never owned Pentax lenses but having looked through them the difference is obvious, so I think they're well worth it compared with ordinary lenses. [I've never seen Nikon or Zeiss ones].

One obvious difference is a reduction in refraction fringes. I've been wearing glasses for decades, and still find the fringes I get with my lesser lenses irritating. [I started off with NHS glass lenses, which were better for vision but not for safety].

I must admit I've never perceived glasses as having depth of field...

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Originally posted by Cheese:

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I find the Zeiss lenses more "involving"; what I look at seems more "present". However, depth of field is better with the Pentax.

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Zeiss are therefore flat earth glasses I reckon ?!


Cheese

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You betcha.

Although I was having a jape, I'm finding that applying "flat earth" parameters to other fields of interest may yield rewards; for example, at my local Thai restaurant there's Tom Kha Gai soup on the menu, which, although not as aesthetic a colour as some other restaurants' Tom Kha, is the very essence of what that dish is about. Delicious and involving.

Thanks for both the helpful and amusing replies.

I think I'll venure in to Boots to see what they have to say about it all themselves.

Cheers,
Martin

Funnily enough I just ordered new glasses with anti-UV, tinted, scratch-resistant lenses from Japan (don't know the brand); frames were $125, lenses (gulp) $300!! Puts Naim prices in focus, eh? ... (ouch)

I had glasses from Boots, and I wasn't very happy with them. They took months to get used to, and I'm still not completely convinced by them. I think one of the lenses has a distortion in it.

They were the most expensive I'd ever bought, as well, coming in at £300 all in.

I'll be buying elsewhere next time.

cheers, Martin

E-mail:- MartinPayne (at) Dial.Pipex.com. Put "Naim" in the title.

Martin

Take the glasses back - get them to check that the centres of the lenses are in the correct place and that they have got the correct prescription with the correct astigmatism corrections in place. Also get a re test of your eyes - the tests are not foolproof and mistakes do occur.

The opticians have huge margins on glasses and can supply several pairs before they lose money - so make sure you get a working pair -

Do not wait until it is time for a new pair - it is time now

Derek

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Originally posted by Derek Wright:
Martin

Take the glasses back - get them to check that the centres of the lenses are in the correct place and that they have got the correct prescription with the correct astigmatism corrections in place. Also get a re test of your eyes - the tests are not foolproof and mistakes do occur.

The opticians have huge margins on glasses and can supply several pairs before they lose money - so make sure you get a working pair -

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Derek,

thanks, I've been through all of that, including a complete eye re-test.

cheers, Martin

E-mail:- MartinPayne (at) Dial.Pipex.com. Put "Naim" in the title.

Martin

If it took you months to get used to them, your eyesight probably changed to accomodate the lenses due the the imperfection rather than the lenses working for you.

Not nice........

Martin

I have had problems when the design/manufacturer of the lens was changed from the one that I was used to. The opticians switched me back to the original supplier to overcome the problem.

I have to have a new pair in the next month and I am not looking forward to changing having had a pair that has worked well for 5 years.

The other key factor especially if you are short sighted is the distance from the eye to the lens - this can make quite a difference especial as the minus dioptre figure increases.

Derek

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I am currently having my new specs remade as the new long / short sighted balance was set to optimise reading, but I couldnt see road signs in the distance (or signs on the roof of white Astras ) when driving

I am also having them anti-reflective coated as I cannot manage without this. I chose originally not to as I find with it is near impossible to get them clean

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Originally posted by Bosh:

I am also having them anti-reflective coated as I cannot manage without this. I chose originally not to as I find with it is near impossible to get them clean

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washing up liquid, under plenty of running water, dried with a well washed cotton hanky, polished with a spectacle-grade microfibre cloth (I favour the blue ones fron Sunglasses Hut)

Rockingdoc

Use the washing up liquid and pentax method. Maybe our very hard water

I also got a pair of trial contacts. Love the 100% field of vision, rather than the 50% I get from the spectacles, but they are a pig to get in and I have worries about eye health with them.

What are your thoughts on extended use weekly contacts, for 24hr use over a weekend or is perserverance with morning in evening out to be advised

Thanks

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Funnily enough I just ordered new glasses with anti-UV, tinted, scratch-resistant lenses from Japan (don't know the brand)

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I have scratch-resistant plastic lenses that where very expensive. Don't have clue to where they are made or by whom, but I can vote for the scratch-resistance coating, it makes them VERY easy to clean. A dot of common detergant on each, some water, rubb with the fingers. Rinse under running water. Now comes the magic thing, they are more water repelant than a goose, just a couple of small drops left that's lifted with some kleenex. Amazing!

Next time I will try to order Pentax ones, as I use there cameras

JohanR

I have worn contact lenses almost daily for 30 years, starting with hard, then gas-permeable, then soft, then extended wear as the technology moved on.
I only wear contact lenses when I am out of the house, so ranging from 0 - 24 hours a day, averaging about 12 hours. Quite often over a weekeend I won't wear them for a whole day or more. My personal experience is that keeping wearing time to a minimum is best.

As to safety; better than glasses for sport, I use mine for cycling,sailing, swimming and scuba.
So long as you don't use spit and tap-water as your cleaning fluids (many do!) you should be o.k.