polycarbonate v. high index lens
hey guys, i was just wanting to seek some advice regarding my lens. i recently put in an order at pearlevision to have my glasses & lens made. my prescription is OD -8.75, OS -6.25. i am seeking the thinnest and lightest lens possible, and at pearlevision, they told me their "microthin plus" lens made from premium polycarbonate is their thinnest lens. however, i'm hearing from many sources that the high index lens is even thinner? is this true? when i confronted pearle vision about it, they told me they use "polycarbonate plus" which is thinner than high index, and that high index is only thinner than ORDINARY polycarbonate.
here is pearle vision's website on the microthin plus lens: http://www.pearlevision.com/webapp/w...&storeId=10001
any insight on which is thinner for my prescription? these "microthin plus" lens made from premium polycarbonate or the high index lens. thank you all in advance!
Abbe Value and Lens Recommendation
Mirage 2K2:
You could be seeing different colors as you describe due to hard coating. I assume you have hard coating and anti-reflective treatment. I doubt that the lenses are processed with a hard coating with an index of refraction greater than 1.60 and it may only be 1.50. This hard coating differencial could be why you are seeing different colors in certain viewing angles.
A lower index lens material with matched hard coating may stop the problem. You could find that a hard coating of 1.60 on Poly could eleminate this issue even though you would have an abbe value that is not that high.
Conclusions about abbe value that many people draw is like conclulding that if you drive down the road you are going to die. You can make this conclusion about dying if you use the following premise. When I drive down the road I may cross the center line at the same time a large bus is approching at high speed. Based on these facts you are likely to die driving down the road, however the number of people who cross the center line at the exact time a bus is fast approching is a very small percentage of people driving.
My above example is to point out that there are many factors that can cause one to draw an incorrect conclusion and without the method to test your premise that the abbe vaue of the lens is the problem, there is no basis to conclude that tht problem with your vision is caused by abbe value.
As OptiDonn stated:
Quote:
Chromatic Aberration is probably one of the better known aberrations by both eye care professionals and consumers alike. As a result I think it gets blamed for alot of things that are totally unrelated.
The original question of this thread? The tinnest lens possible is going to cost considerablly more than the lens that was recommended. Thsi recommendation could have been made due to the patient statements during the fitting that he wanted a total cost within a certain range. Let a competent eyecare professional guide you with your total selection and do not think that you can become an expert by seaching the internet and asking a question and getting a total answer on line. Without seeing the patient and the total sum of the information at the same time a proper recommendation can not be made. The answer to your question is quite different if cost is not object, vs. you have a specific budget range.