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Short corridor with low adds reduce vertical head movement, which some find useful if they're sitting at a workstation. Higher adds can cause problems with short corridors, as progression changes too...

in that case, Fresnel the total resultant prism in the left eye and be very guarded about the likely outcome.

I'd ditch the Rx too - keeping the VA lower in the left would keep any chance of visual confusion in the hunt for binocularity to a minimum, but its going to be trial and error all the way. Good luck...

Fairbanks Facial measurement rule from Rees optical used in conjunction with standard frame rule will be fine. Last dusted down a pair of those head calipers at college some 20 years ago, and never...

Try a balance lens on the left, ditch the prism altogether and see if suppression gives a satisfactory outcome.

If this thread gets as convoluted and contaminated as the same one on theoptom.com, I fear for everybody's sanity. The whole issue blew up in the UK due to the fact that ideas and theory is being...

Aargh, yup - Plus Lenses in Shamir - problem after problem after problem - always too thick. We mow use Hoya or Essilor for plus progressives if we want properly thin lenses.

So what makes a precision instrument "industrial" ? The ability to drop it on the floor? We use a whole brace of manual focimeters, as long as they are checked every now and then, and zeroed every...

sorry to sideline the post. "Chip Anderson is an expert at this" . So why is an expert on something like this banned ?

?? Huh ? Surely it is down to material. A decent V-value with a decent rigidity will allow a much thinner centre substance than a flexi-glass lens ! So...lets have a nice GLASS lens rather than a...

Er..no. Not as far as Essilor are concerned, ha ha ha.

Scanpal 2 from metrologic. It's a peach.

Don't get hung up on 1.74 though - Do the math and see the difference using 1.67 makes - not much !! If he won't accept polycarb, is it because the abbe value is so low ? if so - have a look at the V...

hello ?

Correct. You have identified the issue here, continue with this regime of being more selective to whom you recommend this technology and you'll do just fine.

Time to buy some nice shiny new ones, eh ? :cheers:

Can't fault anything in that post.:cheers:

I'v tried the Physio short. Better than the ellipse. About the same as the Hoya summit CD.

Superlenti blended variable index lenticular with central viewing zone made with 1.6 index, and index increasing as aperture increases. Look lovely, nice and safe, vision as you'd expect..

It is the wearer not the prescription that we are catering for, surely ?
A prescription on its own can't dictate the best form that a correction should take. Why try to address a problem that may...

of course, you're right, I haven't supplied a bicentric single vision for over 15 years, I'd quite forgotten they existed outside of the text books. :o

yes, and no not really. When people are wearing this sort of lens they are very very receptive to your attitude as a dispenser. :cool:

Okay a few factors on the go here. 1st, there is no slab off with round seg bifocals, so forget about that bit. Lets look at what we have.

A request for progressives for someone with cyls so...

That is not a prescription. Call them and ask them what they would like their patient to be wearing.

Do you guys have to deal with this sort of guesswork on a regular basis ??

What a crock.

Do you have the corrected visual acuities ? Is the plano lens a balance or pseudo-aphakic ? I have not supplied an Iesokonic lens in the last 13 years of practice with very good reason. I have dealt...