CurtPalme.com Home Theater Forum

CIR Engineering · Posted: Tue Dec 17, 2013 10:39 pm Post subject:

CIR Engineering · Posted: Tue Dec 17, 2013 10:45 pm Post subject:

CIR Engineering · Posted: Tue Dec 17, 2013 11:00 pm Post subject:

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

I'm guessing the "double vision" is due to internal reflections. (Or it could be because your lens doesn't perfectly correct for your particular visual aberration. I haven't had a razor-sharp prescription in decades, but I'm certain that's correction error, not reflections.)

If it's internal reflections, then hopefully the CR39 will help!

CIR Engineering · Posted: Fri Jan 03, 2014 9:14 pm Post subject:

So I've had the new glasses from Zenni with the CR39 lenses for a couple weeks. All I can say is this is totally awesome Smile

There is really no CA visible on my projector anymore. I can look all over my screen and there are not convergence errors from CA anymore. It is fantastic.

The only time I have actually seen CA on these glasses was when I was looking through a window on a sunny day while at the gym. The window had a black frame and provided a lot of contrast between the outdoors and the frame. At the edge of my lenses with my head tilted back I could see CA, but on my old glasses with the high index it would have been much more obvious.

I am so happy Smile

The only down side is that I don't have the anti reflective coatings on this pair. IMHO it needs the coating and I am seeing reflections all time time from these. But at about $35 a pair I am simply going to order more glasses and get the AR coatings on the next ones.

This is the best thread ever!

craigr

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Brilliant

ecrabb · Posted: Fri Jan 03, 2014 9:47 pm Post subject:

Outstanding, Craig! Thanks for the update! Strangely, my old $200 pair of Perry Ellis frames that I've been wearing for probably 10 years now JUST broke. Today. The spring mechanism in the hinge came apart, so the earpiece won't attach anymore. Literally just a couple of hours ago.

So, I'll suck it up and spend the $100 on a checkup and fresh prescription, but now I can save like $200 on new glasses. So, yes - this thread is pretty awesome!!! Wink

SC

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

I cant stand the AR coating myself, and DLP rainbows are terrible Laughing

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

CRAIG CRAIG!!!!!

Now that I have your attention. Smile

I just received my order from eyebuydirect. I bought three pairs of test glasses. One pair of sunglasses, one pair of regular glasses and one pair of reading/computer glasses. All glasses have the anti-glare coating. The regular and sunglasses have the UV coating. All are single vision with the reading glasses have +1.00 addition. I think it was $55 for all three.

I ordered them three weeks ago last Sunday. They arrived today in boxes similar to bank check boxes. Each has a plastic case with cleaning cloth. The first thing I noticed is that the frames seem more sturdy than the reading glass frames that I bought from my doctor. After trying them on, I was impressed. I don't have a frame of reference, but they seem like they work really well. I am wearing the r/c glasses right now and the computer screen is much clearer with them than without.

I have a question and it might have already been answered in this thread. Is the UV coating necessary? I didn't get it with the r/c glasses, but did with my general glasses. The r/c glasses make the computer screen crisp and clear. The general glasses are only slightly better than no glasses. Since I will probably be wearing the sunglasses outside when it is sunny and not the general glasses, it seems like the UV coating wouldn't offer any benefits. Also, I think I read somewhere that lenses already filter out a lot of UV without the coating.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Thats effing cheap mate, but im not sure what the UV coating is, i dont know if ive ever seen it. The place i get my glasses from is giving free polarising at the moment, but if mine had that i wouldnt be able to use the 3D shutter glasses with them as those are also polarised.

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

Thanks for the info, Gary.

The Trivex material looks interesting. Eyebuy doesn't have it, but zenni does for $30 extra.

As for the UV coating, I am still not sure I want to use it on anything but sunglasses.

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

Just remember that any high-index plastic (like Trivex) is going to have the chromatic-aberration problems that Craig encountered. Particularly if you have a strong prescription, you might not like it.

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

According to your link, Trivex has the same index as glass at 1.53. I don't have a strong prescription, so I can't imagine it would have much of an effect.

ecrabb · Posted: Thu Feb 27, 2014 4:33 pm Post subject:

If the Trivex has the same index of refraction as glass, the chromatic aberration should also be similar.

The only way to completely eliminate CA is to use multiple lenses like in a good camera lens. Most people wouldn't be happy walking around with achromat doublets stuck on their glasses frames. Wink

CA, uncorrected peripheral, and distortion of the main reasons I wear primarily contacts and only use my glasses at bed time and the occasional lazy morning.

SC

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

I would love to wear contacts, but they drove me nuts. I should probably head over to Bascom Palmer and see if Lasik is an option.

ecrabb · Posted: Fri Feb 28, 2014 4:13 am Post subject:

CIR Engineering · Posted: Fri Feb 28, 2014 4:25 pm Post subject:

Another thing about lasik is that there is about a 1% failure rate. Meaning that your vision in one eye could be worse than before the surgery and then no longer correctable.

craigr