is there really a difference between plastic and glass lenses

[cjtune]

Do you know that there are "glass" molded lens not only plastic.... :0)

I think all glass lenses start out as molded chunks. They are later ground to the precise dimensions.

 

[Mikefellh]

Actually mike, they already do.

Where eyeglasses are concerned, plastic makes them so much lighter and manageable.

Um, my comment was a sarcastic joke, that's why the "face". People were commenting about the lack of optical quality of plastic lenses, so I decided to make a joke about eyeglass lenses. :kok:

 

[drektster]

Um, my comment was a sarcastic joke, that's why the "face". People were commenting about the lack of optical quality of plastic lenses, so I decided to make a joke about eyeglass lenses. :kok:

Well, i use to deal with building material, emulsion paint (organic material) creates a better environtment for algea and fungus, however glass dont. infact sometimes fungus grow deep into the plastic material but only grow on the surface of glass.

so, do you actually think that plastic is better than glass? think again.fungus on glass lenses should be easier to remove compare to plastic.

 

[Blu-By-U]

So why is there fungus on them lens? Is it because of the PLASTIC coatings?

 

[drektster]

So why is there fungus on them lens? Is it because of the PLASTIC coatings?

i am not a professional chemist but base on me knowledge. it could be the reason why fungus grow on the plastic coating.

if fungus grow largely on glass. then you will see people using plastic test tube. sometimes some fugus feed on plastic. eg. cd rom.

i have seen fungus feeding on my dvds before.

 

[Blu-By-U]

.... it could be the reason why fungus grow on the plastic coating.
... fungus feeding on my dvds before.

so must store them DVDs in dry box as well!!! All me picture back up on them DVDs!!!

 

[drektster]

so must store them DVDs in dry box as well!!! All me picture back up on them DVDs!!!

ok, if you really wants to hear....

plastic is better than glass in all ways......

 

[OlyFlyer]

Another thing nobody mentioned is the static electricity. Plastic would charge, glass would not. Even if it is of antistatic type it would be worse than glass, it would attract dust and the lens would have to be cleaned more ofthen than glass. Since plastic is easier to scratch, more cleaning means more scratches. Due to static electricity the dust sticks more to plastic which in turn demands harder cleaning, blowing would not work in most cases. I do wear eyeglasses but as long as my glasses don't need to be thick I will use glass. Another problem is that I need progressive glasses and that technology is not as good yet with plastics according to my optician.

My idea for lenses is the following; Today we use plastic coated glass. Why not use glass coated plastic instead? That would create lighter optics and harder surface. Manufacturing may not be easy but I think for high quality lenses that would be a way to go. There are some practical problems, like the different coefficient of expansion/contraction and so on, but that could probably solved by some more intelligent chemists than I am (I am not a chemist at all). Anyway, just an idea...

 

[drakon09]

Um, my comment was a sarcastic joke, that's why the "face". People were commenting about the lack of optical quality of plastic lenses, so I decided to make a joke about eyeglass lenses. :kok:

Oh.. sorry mike.. :sweatsm: