Hard and Soft PAL Designs - Pros and Cons

**cindiaugustine** · 02-24-2009, 07:48 PM

Okay, y'all have been so helpful on the other subjects I've proposed. So what would you say you find to be the pros and cons of Hard PAL designs vs Soft PAL designs and vice versa?

I'm studying for my midterms and thought I'd see what you guys could add to the text book opinion.

Looking forward to what you have to say.

Cin

**Jacqui** · 02-25-2009, 07:04 AM

What is the books opinion??

**Fezz** · 02-25-2009, 07:11 AM

What book?

**HarryChiling** · 02-25-2009, 07:54 AM

Soft designs are easier for the early presbyopes to adapt to, hard designs offer wider areas of distance and reading for advanced presbyopes.

**cindiaugustine** · 02-25-2009, 11:30 PM

Originally Posted by Jacqui

What is the books opinion??

The textbook says that hard designs have a steeper progression of unwanted cylinder making them harder to adapt to, but giving them a more stable distance and reading area, while sacrificing some of the intermediate area.

Soft designs, in general, will have a lower dioptric value of unwanted cylinder at their highest than a hard design, but will sacrifice some usable reading and distance area. Easier to adapt too, however.

Pretty much as Harry says. :-)

**cindiaugustine** · 02-25-2009, 11:32 PM

Originally Posted by Fezz

What book?

The text book is The System For Ophthalmic Dispensing by Brooks and Borish, one of our 3 text books.

**Fezz** · 02-26-2009, 05:29 AM

Originally Posted by cindiaugustine

The text book is The System For Ophthalmic Dispensing by Brooks and Borish, one of our 3 text books.

That is the Bible of dispensing!

Great stuff!

:cheers::cheers::cheers:

**Jacqui** · 02-26-2009, 08:03 AM

Originally Posted by cindiaugustine

The text book is The System For Ophthalmic Dispensing by Brooks and Borish, one of our 3 text books.

Believe every word of the book !!!!!!!!!

**Fezz** · 02-26-2009, 08:49 AM

Originally Posted by cindiaugustine

The text book is The System For Ophthalmic Dispensing by Brooks and Borish, one of our 3 text books.

I am curious-what are the other two textbooks?

**HarryChiling** · 02-26-2009, 11:13 AM

Originally Posted by Fezz

I am curious-what are the other two textbooks?

I would guess Ellen Stoner's Optical Formulas Tutorial as one of the others and maybe Dictionary of Eye Terminology by Barbara Cassin.

**cindiaugustine** · 02-26-2009, 03:44 PM

Originally Posted by HarryChiling

I would guess Ellen Stoner's Optical Formulas Tutorial as one of the others and maybe Dictionary of Eye Terminology by Barbara Cassin.

No, but maybe those are used mainly in the US? I'm in Canada, don't know if that has anything to do with it.

The other two are:

The Ophthalmic Assistant by Stein and Freeman
Essentials of Ophthalmic Lens Finishing by Brooks

Cin

**Jacqui** · 02-26-2009, 04:28 PM

I'm familiar with Essentials of Ophthalmic Lens Finishing by Brooks it is also one of the bibles, at least here.

**cindiaugustine** · 02-26-2009, 10:37 PM

Originally Posted by Jacqui

I'm familiar with Essentials of Ophthalmic Lens Finishing by Brooks it is also one of the bibles, at least here.

The Douglas College program is an excellent one, I feel lucky to have found it and very excited to get out into the field now. :-)

**Jacqui** · 02-27-2009, 07:29 AM

And when you graduate you can go to work for me !!! We do all the old time lens and frame work that most others don't do or don't know how to do.

**cindiaugustine** · 02-28-2009, 12:15 AM

Originally Posted by Jacqui

And when you graduate you can go to work for me !!! We do all the old time lens and frame work that most others don't do or don't know how to do.

Hmmm, is Frostbite Falls as "warm" as it sounds??

Cin <-- who is a Vancouverite and therefore wimpy about coooold weather!

**Jacqui** · 02-28-2009, 06:49 AM

Originally Posted by cindiaugustine

Hmmm, is Frostbite Falls as "warm" as it sounds??

Cin <-- who is a Vancouverite and therefore wimpy about coooold weather!

It only got down to -46F this year, kind of a warm winter for us. :D

**HarryChiling** · 02-28-2009, 10:38 AM

Originally Posted by cindiaugustine

No, but maybe those are used mainly in the US? I'm in Canada, don't know if that has anything to do with it.

The other two are:

The Ophthalmic Assistant by Stein and Freeman
Essentials of Ophthalmic Lens Finishing by Brooks

Cin

Both great books, the Ophthalmic Assistant is a definite keeper, you could train COA, COT, COMT, CPO, CPOA, and CPOT's with that one and still have some mileage left.