Manufacturing our own spectacles?

Zenni has instructions for measuring this yourself. Last time I went for an eye examination I asked the optometrist to put the PD on the prescription. I was paying him, so he did so (in fact went further and gave me prescriptions for far and computer glasses with different PDs for each), but he grumbled a bit (he also sells eyeglasses).

My significant other is getting NOWHERE near my eyeballs with a pair of steel caliper points, thank you.

Ouch! I can't bend enough to get my nose under my foot.

-- Ed Huntress

sounds like a guns store.

anyway, there is "resin" which is the cr-39 stuff. it's very clear, and doesn't yellow like polycarbonate. The optical quality usually exceeds that of polycarbonate.

if you have a strong prescription, both are crap. You'll notice any camera that costs more than $10 has glass optics.

I'm not sure if this applies to other states (it may be a federal thing) , but at least here in IL, you have to get a signed copy of your prescription.

Most places won't give it unless you ask. If you ask and they say no, just don't pay. It's pretty simple. If you pay for an eye exam you better get the results.

Any other argument is as stupid as a dr. not letting you know your weight or blood pressure from an exam because they need to protect their business. It's just bullshit.

Pedant ;-)

Somewhat less than a foot...

Mark Rand (Currently negotiating with the boss to get a paid for set of monitor distance glasses and another set of safety glasses for site use) RTFM

I thought that was a lizard ?

John S.

He's more of a snake than a lizard if the truth be told...

Mark Rand RTFM

Er indoors has a complex astigmatism correction and has had plastic light sensitive lenses from

A trick I also found useful is to add a few diopters to your normal reading prescription to get a pair of prescription magnifying glasses

- ideal for detailed work.

On Tue, 6 Jan 2009 16:24:29 -0000, the infamous "bob" scrawled the following:

I last had mine checked at the Optometric Center of the local Costco. they had a setup not unlike a stereo slide viewer. The optician's assistant could read both the pupillary height and separation by adjusting the knobs while I looked at the pic at the end of the stick. It was roughly 18 to 24" long.

-- Books are the compasses and telescopes and sextants and charts which other men have prepared to help us navigate the dangerous seas of human life. --Jesse Lee Bennett

In article , Cydrome Leader writes

Actually, some very expensive camera lenses have moulded plastic aspherical lens elements hidden away in their depths - useful for reducing spherical aberration. Your point is generally valid though.

David

I have at least one wide-angle zoom that's alleged to have a magic plastic element in it somewhere. I'm not sure how crazy it's shaped or what it's really made of. I've not hear of them yellowing/cracking doing weird stuff like that, so it must be a decent material.