Need lineless lens with minimal distance peripheral distortion

[snowmonster]

I've got a patient in a Shamir Genesis right now with a +2.00 add who is bothered by the peripheral distortion in the lens. He's a surgeon at a vet school here.

So he wants a lens with normal distance and doesn't appear to care about any peripheral distortion below the visual axis. I know about all of the Sheedy reports and which lenses have the widest distance portion, but I don't know much about the older lenses, like the Super No Line, Smart Segs, or any of that stuff. I don't know that intermediate vision is all that important for this guy.

Any ideas?

-Steve

[AWTECH]

I suggest an ICE-TECH individualized PAL. My company makes these.

Contact me next week when I return from Vision Expo. You can also private message me for price info.

This design has full side to side distance.

[gemstone]

I used to run into this with weak spheres in the verilux. VIP on Super no line have clear distances.

[For-Life]

If it is reading and intermediate use the Solamax, as it has a much wider reading and intermediate area than any other lens. The distance is not great, but it is the compromise.

NOW if his glasses are for reading and intermediate only, get him a pair of Access, Shamir Office, or Nikon Online lenses. He will get up to 8 ft of distance and a much wider and clear area.

[snowmonster]

No, he would hate a SolaMax. He's wanting good distance and doesn't care about intermediate or near as much.

-Steve

[For-Life]

No, he would hate a SolaMax. He's wanting good distance and doesn't care about intermediate or near as much.

-Steve

Oh, that changes everything.

Pick the Varilux Ellipse or Physio. Those two lenses focus on distance.

[snowmonster]

Is there a place that anyone knows of where Sheedy published the astigmatism maps (for lack of a better term) for the lenses that they analyzed?

-Steve

[Audiyoda]

Of the new lens designs on the market, the Genesis is the one I really don't like. That said, it's really the only current generation lens I've found with a distorted field at or above the MRP. Every other lens I've dispensed (freeform or current generation) seems to have really done a superior job and minimizing distortion along and above the MRP. I don't notice any distortion whatsoever in my Physio360 or Kodak Unique.

[gemstone]

Is there a place that anyone knows of where Sheedy published the astigmatism maps (for lack of a better term) for the lenses that they analyzed?

-Steve

Look around in the Progressive forum. I think I saw a link posted by one of the board Gurus here.

[Chris Ryser]

Look around in the Progressive forum. .

Or just give him NO progressive and case is settled................:bbg:

[chip anderson]

I'm with Chris. Does the patient really think her veteranry patients will care if she's over 40 and needs bifocals?

[KStraker]

If he wants a wide distance area, I'd go with Hoya's Summit ECP. If he wants to pay a lot you might also consider the iD. I would also consider trying the icetech free form progressive.

[DragonLensmanWV]

Younger Image has a very clear distance area.

[Bill West]

DEFINITY, I wear one it's like single vision and I can read.:cheers:

[obxeyeguy]

I wear definity also, and switch with a regular physio. I am very critical in my distance ( low myope, can still read with them off) and both work fine.
Near in them seems almost the same
Mark

[Robert Martellaro]

Steve,

Distance peripheral blur, or off-axis blur in general, can be caused by many factors, not limited to PAL design. You didn't state the distance Rx, but anything more than a couple of diopters must have a "best form" base curve. Transverse/lateral chromatic aberration can also cause off-axis blur with the right combination of lens power and lower Abbe value lens material. Moderate to high amounts of cyl can also degrade off-axis vision, especially with an oblique axis.

Regarding PAL design, the older hard designs e.g., VIP and Super No-Line, are very clear at and above the fitting cross (and the distance periphery) but blur quickly with noticeable boundaries below and to the side. You might not want to go there if the subject as been wearing softer designs, and/or if the Add power has increased.

A better choice (than hard designs) might be Zeiss's Gradal Top. I don't believe you can get a better lens that has the combination of clear off-axis distance vision, a nice cushion of distance clarity below the FC, soft design, and very good binocular vision. However, because of the long corridor, the near utility is compromised, primarily with adds above +1.75.

Regards,

[drk]

My man Robert is right, as always. I'm thinking Gradal Top. Or even the dreaded Percepta.

In reality, if you take a Gradal Top and make sure it's not fit too high, then you've got a clear distance zone.

All this may bite the patient on near area, of course.

[Andrew Weiss]

Gradal Top for sure. I usually fit it about 2-3mm below pupil center; if I really want to get the distance clear I go 4mm below pupil center, but for most people it pushes the reading area down too low. Minimum fitting height on the Top is 20.

Also Rodenstock Life 2. Fitting height is 18. That lens really has to be fit 2-3 below pupil center to work well.

I believe both the Gradal Top and Life 2 are very sophistocated variations on hard design. I'm sure Robert or Darryl will confirm or correct me ;)

[For-Life]

The dreaded OB response

One question, 20 answers.

Boy is our industry diverse...In a good way

[FVCCHRIS]

Patient doesn't want peripheral distortion and doesn't care about the midrange area......ROUND SEG BOYS! :hammer: Patient will thank you.

[Fezz]

.ROUND SEG BOYS! :hammer: Patient will thank you.

What size? 22, 25, 28? Ultex? :D

:cheers::cheers:

[a1vo]

Is there a place that anyone knows of where Sheedy published the astigmatism maps (for lack of a better term) for the lenses that they analyzed?

-Steve

Bobie - He is the Guru has all kind PAL plots.

[Ory]

How about the classic Younger Seamless (?)

Essentially a round seg that has been blurred away. No distortion at distance, then terrible distortion and you're into the near area.

Seems to fit your criteria.

[Chris Ryser]

Transition

- �nica lente bifocal Ultex Transitions III dispon�vel no mercado.
- Indicada especialmente para presbitas hiperm�tropes.
- 100% prote��o UVB e UVA.

:cheers: :cheers: :cheers:
The Winner

[JerryR]

I wear the Definity and it seems to work well for me. You may want to try the Varilux Liberty it is the closest Pal to a flat-top.