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1. ## Thread: High minus flat lens causing temple splay.

by Lensman11
Replies
8
Views
312

### This is a very difficult problem for a lab that...

This is a very difficult problem for a lab that receives hundreds of different frames to know all the issues each frame will encounter. If a lab is lucky enough to supply all the frames they have to...
2. ## Thread: Induced Prism in a direction I would not expect?

by Lensman11
Replies
18
Views
520

### Your request was posted directly above your last...

Your request was posted directly above your last post
3. ## Thread: Induced Prism in a direction I would not expect?

by Lensman11
Replies
18
Views
520

### Not to be repetitive the cylinder is the value of...

Not to be repetitive the cylinder is the value of the difference of the two Primary powers if you want to say it has power that is fine. If it has a power than it has to have a value plus or minus....
4. ## Thread: Induced Prism in a direction I would not expect?

by Lensman11
Replies
18
Views
520

### The cylinder represents the difference in power...

The cylinder represents the difference in power between the two principal meridians. When neutralizing the lens in a vertometer you will not find a reading of -5.00 only 0.00 and +5.00 the powers in...
5. ## Thread: Induced Prism in a direction I would not expect?

by Lensman11
Replies
18
Views
520

### Kwill212 please give a more detailed explanation...

Kwill212
please give a more detailed explanation of your solution. The cylinder on a lens has no power it only represents the difference between the principal meridians in this case +5.00 and 0.00
6. ## Thread: Induced Prism in a direction I would not expect?

by Lensman11
Replies
18
Views
520

### I would guess you are calculating the power at...

I would guess you are calculating the power at 180 and then using Prentices rule for prism. That does not yield the correct answer except if the axis is 180 or 90.Opti campus answer is the correct...
7. ## Thread: Helicopter pilot lens

by Lensman11
Replies
12
Views
702

### Hi i am currently retired so can’t give you a...

Hi
i am currently retired so can’t give you a specific lab. The product is listed in XCel catalog as semi finished product so try calling them. Secondly contact any lab that does glass themself they...
8. ## Thread: Helicopter pilot lens

by Lensman11
Replies
12
Views
702

### Still available from XCel in two sizes 9 22 9 25

Still available from XCel in two sizes 9 22 9 25
9. ## Thread: It's 2018... Who does Rimless/Drill Mount the best?

by Lensman11
Replies
41
Views
10,070

### There is no definitive answer to the question...

There is no definitive answer to the question when to change the cutter. How many poly do you do, how thick is every lens as drilling a -6.00 wears the bit way more than -0.50. No one collects that...
10. ## Thread: It's 2018... Who does Rimless/Drill Mount the best?

by Lensman11
Replies
41
Views
10,070

### If the process is done correctly there is no need...

If the process is done correctly there is no need to do anything to the holes or the edge. Change the cutting bit when it is due. Yes it cost money to replace the cutter but the damage done by not...
11. ## Thread: It's 2018... Who does Rimless/Drill Mount the best?

by Lensman11
Replies
41
Views
10,070

### Obtain some UV cure hard coat from your lab. You...

Obtain some UV cure hard coat from your lab. You will need to purchase a uv light to cure the coating but it will shine the edges and seal the holes. Application will be with a paint brush any...
12. ## Thread: Calculating Lens Thickness

by Lensman11
Replies
3
Views
526

### Calculating the thickness can get quite...

Calculating the thickness can get quite complicated especially with progressive lenses. To keep it simple and have a reasonable result you need the axis of the ED then determine the curves at that...
13. ## Thread: Abo help

by Lensman11
Replies
21
Views
1,617

### When Prentice came up with his infamous rule...

When Prentice came up with his infamous rule Toric lens were rare expensive and hardly used. I don’t think he even considered the effect of a lens with two powers.
14. ## Thread: Abo help

by Lensman11
Replies
21
Views
1,617

### Prentices rule is being used incorrectly. It...

Prentices rule is being used incorrectly. It will only provide a correct answer with a spherical power or where the axis is 90 or 180. As an extreme case to show why it does not work. Rx +2.00 -400...
15. ## Thread: I think Zeiss is now in a very good position for a change.

by Lensman11
Replies
120
Views
16,896

### I think you over thinking this issue. When you...

I think you over thinking this issue. When you fit a s.v. Lens you put the oc in the geometric center but normal gaze is usually above geometric center. This is rarely a problem. The same holds true...
16. ## Thread: History Lesson Please

by Lensman11
Replies
8
Views
1,154

### The progressive with an ultex seg on the top was...

The progressive with an ultex seg on the top was originally. Called the pilot as it was intended to allow the pilot to see the gauges above his head The add on the top was 3/4 of the bottom add....
17. ## Thread: Px distortion problem.

by Lensman11
Replies
6
Views
813

### Check if the lens is warped. Use a lens clock and...

Check if the lens is warped. Use a lens clock and check at 90 and 180. The true base curve will be at 90, compare that with the other glasses the patient is wearing.
18. ## Thread: Px distortion problem.

by Lensman11
Replies
6
Views
813

### It is possible that one or both of the lenses are...

It is possible that one or both of the lenses are off polarization. It is common error at the lab being they are spheres the mark up person could easily forget to watch the polarization axis. You...
19. ## Thread: Slab-Off Pal

by Lensman11
Replies
7
Views
965

### It can be done on any digital progressive, the...

It can be done on any digital progressive, the lab just has to put the slab on the front. Younger makes cast slab blanks which could also be used. ( I am not sure they still make the product)
20. ## Thread: Should Be Mandatory Reading For Opticians

by Lensman11
Replies
19
Views
1,669

### The skills that defined an optician have all been...

The skills that defined an optician have all been automated. The customer interaction has always been extremely poor. The ability (with a few exceptions) to direct a customer to proper lens selection...
21. ## Thread: Reliability SatisLoh Vs OptoTech Vs Schneider Vs Coburn Optical Generators, Polishers

by Lensman11
Replies
6
Views
1,374

### I have many years experience with all three...

I have many years experience with all three manufacturers and would say they all fall short in some areas. Operating a free form lab is not a simple task. Plan on having a trained tech on site and...
22. ## Thread: Pattern of being stupid

by Lensman11
Replies
18
Views
1,418

### This is my experience managing a lab doing 1800...

This is my experience managing a lab doing 1800 orders a day. We supplied 85% of the frames for our orders and did not trace anything except the first time we processed the frame. This is what I...
23. ## Thread: Transitions XTRActive and AR

by Lensman11
Replies
21
Views
3,777

### They indeed react to visible light but not the...

They indeed react to visible light but not the the full spectrum. They do not activate to their full potential in a car because the uv is blocked. If they reacted to the full spectrum they would not...
24. ## Thread: Transitions XTRActive and AR

by Lensman11
Replies
21
Views
3,777

### Remember Transitions is activated by UV not...

Remember Transitions is activated by UV not visible light. Most materials block uv except cr and many AR coating are formulated to do the same. So the goal is to not block uv.
25. ## Thread: MBS Formula issue

by Lensman11
Replies
2
Views
455

### Hi if your input numbers are being taken with a...

Hi
if your input numbers are being taken with a mm scale you will be wrong as often as you are correct. To get the E.D. Of a frame you must box the shape or get from the frame specs or get from your...
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