PAL Design Comparisons??

[Lady Nicole]

Maybe this is a really stupid question, but how exactly do you compare progressives? I hear so many opticians saying so many variations on "this progressive is wider/shorter/better/whatever than that progressive" but where does that information come from? I've recently begun wearing progressives and only have personal experience wearing the Varilux Panamic. I often recommend it to my patients, because I've used it myself and know what my own experience was. I guess my question is, how do you really know how a lens like the Panamic compares with other progressives like the Comfort or the Genesis or the Hoya Wide any other brand, without actually wearing it yourself? Do I just believe what the manufacturers tell me? Do I keep on repeating what I hear other opticians saying? I don't really want to do that. Are there charts or graphs that can give you a representation of the lens on paper? Any info or suggestions are appreciated. :bbg:

[rinselberg]

Hello Lady Nicole,

Click below and it will take you to another OptiBoard thread with a link to a web page which will link you to some research papers that may be of interest to you.

All the best,
rinselberg


CLICK HERE:
http://www.optiboard.com/forums/showthread.php?t=14793

[Lewy]

Wearing them is still the best comparison. I have just started wearing a 'Vartek Short Corridor' PAL which is a budget PAL, quite cheap in comparison to many. I am comparing it with the Ipseo which is roughly 4 x the price. I have to say I cannot see that much difference in them. I have compared distance and near fields of clear vision, percieved levels of swim, general comfort and quite honestly there is not a great deal of difference.............frightening isn't it!

Lewy

[apaul]

Hi Lewy

Im curious to see what your rx is
could you let us know

Thanks

Alan

[Adachi Takehisa]

[QUOTE=Lady Nicole]
Are there charts or graphs that can give you a representation of the lens on paper?

As for me, the analysis paper of Following URL was consulted. I recommend.

http://optometry.osu.edu/research/coor/4059.cfm

[Happylady]

I love the charts, but there is nothing like wearing them and having people you know well wear them. People differ in what they like, though. I have a coworker that liked the Sola Max and I thought it was swimmy. I liked the Sola One and she didn't. I find this surprising as she is much pickier then me when it comes to progressives. I can wear anything though some I like more then others.

We both liked the Hoya Wide and Varilux Panamic. Neither of us loved the Concise.

[AWTECH]

Remember the same beginning lens blank surfaced by two different labs will not necessary yield the same result. Worn laps, poor surface blocking, etc. can produce different total results while in a lensometer the Rx is on target. Unfortunately the equipment to actually measure the finished surface exactly does exist, however this equipment costs as much as the all of the equipment used to produce a pair of lenses and is not used during production of a lens, only for development of a new design of lens.

I would predict that "ray tracing programs", for verification, can be produced at a price point that will allow a lab to offer confirmation of the visual quality of the lens produced. Look for this in the near future.

Know the lab and the progressive you are dealing with and if your patients has excellent vision as a result of your choice, then I would say you picked a good lens design and a good lab.

[suwit]

Hi Lawy
What is your HE ,ST in IPSEO
IPSEO canbe everything....

[Lewy]

Hi Lawy
What is your HE ,ST in IPSEO
IPSEO canbe everything....

Rx = -0.50/-0.50 x 5 Add 1.50
-0.25/-0.50 x 180 Add 1.50

HE = 0.15 ST = 0.08

I still prefer the Ipseo as the clear areas of vision are easier to find but there is not a huge difference between them.

Lewy

[suwit]

What about
Rodenstock Impression ILT Xs
have you try this lens?

[suwit]

What do you think about
Rodenstock Impression ILT Xs !!
my customer so happy with this lens
with mith maximum wide on distance that great !

[Bev Heishman]

Excellent article by Jim Sheedy OD regarding comparisons. It can be viewed at www.shamirlens.com/pdf/Dr.%20Sheedy

[Bobie]

Dear Nicole ,

We use trial PALs 34 mm in trial frame to compare PALs in each Rx of customer , our trial PALs are Plano ADD 1.00D to Plano ADD 3.00D.

Now , we have trial PALs at below ;

Varilux Panamic , Varilux Comfort , Rodenstock Progressiv AT , Hoyalux Summit pro , Hoyalux Summit CD , Hoyalux GP Wide , Hoyalux TACT , Essilor InterView080 , Rodenstock Nexyma 40 , Rodenstock Nexyma 80 , Kodak Concise , Hoyalux GP , Sola XL ,

And we also have Bi-focal trial lenses like FT and KT.



We use titanium trial frame adjust that can put 8 pieces of lenses. ( This trial fame can adjustable for Pantoscopic Tilt Angle ( PTA ) , P.D. and P.Height.



The procedure to compare this trial PALs are below ;

1. Correct distant Rx with single visiontrial lens first.

2. Put PALs Trial Set Plano ADD that you would like to compare in Rx addition to Trial Frame.

2.1 Test reading area with newspaper and mark with big pen and find out distorsion by swing you head and move you eye around to check the swimming effect on newspaper and do the same for other PALs that you would like to compare.

2.2 Test intermediate area by use the clear plastic film cover on the monitor of computer and test for intermediate vision with computer and swing your head and move you eye around to check the swimming effect on screen , then mark with big pen and do the same for other PALs.

2.3 Test distance area by looking to Snell Chart at 6 meters and swing your head and move you eye around to check the swimming effect at distance.

2.4 Test instant focus system by changing focus from far to near , near to far , far to intermediate and intermediate to near , do it many time and do it fast as fast possible to compare many difference kind of PALs.

2.5 Test for dynamic vision by walking and moving around fast as fast possible to check swimming effect and speed of clear vision.

2.6 Test for comfort of vision by wear it for 20 minute and act like in your real life like your work , your hobby , your habits and your car.

2.7 You can use this method to present your customer that , how big difference between cheap PALs and expensive PALs. ( Normally , I use Varilux Panamic compare with Hoyalux GP and all of my customer know that Panamic better than GP more than 3 time in every test , and nobody would like to going for GP or cheap PALs anymore. If they have low budget , they will going to any PALs that between GP and Panamic , like Varilux Comfort , Sola Percepta , Rodenstock Progressiv AT, but more than 5% of them going for Varilux Ipseo , 15% of them going for Rodenstock Impression ILT , 20% going for Panamic and 20% of them going for Varilux Comfort , 25% going for Rodenstock Progressiv AT and less going for Essilor InterView 080 )



· We have Advance Progressive Addition Lenses Club ( APC ) in Thailand , and we have been test many premium PALs on one person for Rodenstock Impression ILT , Panamic , Ipseo , Comfort , Rodenstock Progressiv AT , Rodenstock Impression ILT XS , Hoyalux Summit pro , Hoyalux iD , Hoyalux Summit CD , Hoyalux GP Wide , Hoyalux TACT , Essilor InterView , Rodenstock Nexyma 40 and 80 to find out final conclusion in 9 months of used. We chosse our fathers to test because it is very easy to follow up. ( Our father lived with us )

· We never believe what company of PALs say , we believe only what we test.

· We can say , Rodenstock Impression ILT is much better than Hoyalux iD in every point and Varilux Comfort much better than Hoyalux Summit pro.

· We can say , Varilux Ipseo is much better than Varilux Panamic and the price of Varilux Ipseo is very reasonalble if compare the price per performance with Varilux Panamic.

· Customer who move the head more than the eye , suitable for more soft design and dynamic vision is their piority.

· Customer who move the eye more than the head , suitable for more hard design and panoramic vision.

· Customer who have high hyperope or high myope and with high presbyope, suitable for Variable Inset PALs by Ametropia and Addition like Varilux Panamic

· Customer who have problem about near point convergence or Anisometropia over 1.25D or CYL. Over – 2.00D , suitable for Free Form PALs like Rodenstock Impression ILT , Varilux Ipseo , Hoyalux iD.

· Customer who have special parameter of Pantoscopic Tilt Angle , Face Form Angle , Cornea Vertex Distance , suitable for Individual Free Form PALs like Rodenstock Impression ILT.

· We always recommended the best PALs in maximum budget of each customer , no other.


Sincerely ,

Mr.Somboon Chaowanakosol
President
Advance Progressive Addition Lenses Club ( APC )
www.apcthai.com

Bangkok , Thailand
e-mail : apcoptik@yahoo.com
Tel.+66 (0) 1 5384200
" Life is beautiful and sight is life "