Atoric Lens

[mahmoud.hamza]

one Of our custumer (an opticien) sold a lens with this RX :
R : sph:-13.50 cyl:-2.50 axis 21
L: sph:-11.00 cyl:-1.75 axis 155
This lens was in 1.67 transition V atoric from optiswiss software, and in my big surprise the wearer can't see in the périferic area Of the frame .
I touk out the lenses from the frame and tested it with a stressmeter I found some stress in the périferic area Of the lens .
Is It normal ?? because as I know an Atoric lens must be very confortable and must have no stress On it !!
the wearer told me that the adaptation is very very quick and the lens is very nice in the center but in the periferic area no way ..... he can not drive with It !!!:hammer::hammer::hammer:

[Robert Martellaro]

one Of our custumer (an opticien) sold a lens with this RX :
R : sph:-13.50 cyl:-2.50 axis 21
L: sph:-11.00 cyl:-1.75 axis 155
This lens was in 1.67 transition V atoric from optiswiss software, and in my big surprise the wearer can't see in the périferic area Of the frame .
I touk out the lenses from the frame and tested it with a stressmeter I found some stress in the périferic area Of the lens .
Is It normal ?? because as I know an Atoric lens must be very confortable and must have no stress On it !!
the wearer told me that the adaptation is very very quick and the lens is very nice in the center but in the periferic area no way ..... he can not drive with It !!!:hammer::hammer::hammer:

One possibility is that the back surface design is biased towards cosmetics (as thin as possible) instead of best form optics (least possible off-axis astigmatism and power error). I would also expect some peripheral blur due to the relatively high degree of dispersion found in most super high index lenses (see Abbe value).

[drk]

I, too, wonder if peripheral optics in a 1.67 is going to be good at that power range. Material limits design success.

General question: Is this a case of an optical lens laboratory (opti-swiss?) creating it's own lens design via freeform? Maybe it's as simple as they didn't, for some reason as Robert said, optimize the vision.

Another question: if there is "stress" in an unmounted lens, what exactly is that, and what does it mean?

[DragonLensmanWV]

I, too, wonder if peripheral optics in a 1.67 is going to be good at that power range. Material limits design success.

General question: Is this a case of an optical lens laboratory (opti-swiss?) creating it's own lens design via freeform? Maybe it's as simple as they didn't, for some reason as Robert said, optimize the vision.

Another question: if there is "stress" in an unmounted lens, what exactly is that, and what does it mean?

Bingo! The ABBE of the 1.67 is terrible, as bad as polycraponate, so your customer will have a badly distorted periphery.

[aserels]

Has optiswiss or any other labs created their own freeform software that they then sell to others?

[mahmoud.hamza]

optiswiss, shamir, indo, seiko all these laboratories have there one design and they sell it to other .

[Chris Ryser]

See the FF lenses being made at Optiswiss, at: Video

http://www.optiswiss.ch/english/production/

[sharpstick777]

The RX could be off as well. I would use +or - .25 flippers to see if peripheral VA improves. People often can compensate better through center of a lens so it masks a slight RX adjustment. I guarantee you with that power that if he got 4 refractions he would have 4 different RXs.

If the flippers don't help, increase face form.

Also, it depends on what the person was in before. Often people get used to bad eyewear and good eyewear shows the faults of the previous lens. Try matching the face form and OC of their previous pair of glasses to help him get used to the lens, then adjust back to correct position.

Ususally a material issue will be consistant throughout the field of view. But its still a possiblity that the thickness is agravating a borderline material problem.