3D effect when looking through glasses

[dmitrijsg123]

Px got two pairs of glasses, came back a week after. 1st pair worked out fine, but complaining about the 2nd pair - quite big polarized sunglasses. Saying that everything looks as if he is looking through 3D glasses.
Is it down to the encreased magnification in the 2nd pair? Rx is only R +1.25DS/-0.25 L +0.75, so it's not that the lenses worked out much thicker than in the 1st pair.

[EyeSore]

Maybe the lenses weren't laid out on the 180 axis . Just a thought .

[dmitrijsg123]

No, polarized orientation not an issue - checked it first thing and it is fine. Thanx for the thought anyway.

[Steve Machol]

I think Eyesore is right. When polarized lenses are dispensed with unequal polarization (suck as one at 180 and another at 90 degrees) they could cause that effect.

[Steve Machol]

No, polarized orientation not an issue - checked it first thing and it is fine. Thanx for the thought anyway.

How did you check it?

[dmitrijsg123]

checked against the LCD screen of the digital focimeter (screen black-out at 180 degrees).

[drk]

Saying he sees 3D is awesome!

Wait! Maybe you gave him 3D specs, instead of sunglasses!!!

[CME4SPECS]

shouldn't it black out at 90?

checked against the LCD screen of the digital focimeter (screen black-out at 180 degrees).

[Steve Machol]

I once borrowed a pair of cheap polarized sunglasses that had this same effect - everything was kind of like 3D. When I had the chance I checked the polarization of each lens. One was 180 and the other around 75 or 80 degrees. The fact that the light was polarizid at different axes was causing this effect.

Frankly I can't think of anything else that makes sense.

[dmitrijsg123]

do you know what, guys - thanx for your posts. i am starting to doubt myself now. i am gonna check the glasses tomorow (off today) - maybe i didnt check the polarization properly

[Barry Santini]

Lenses are too tight, causing varying polarization axis. Check eye wear by holding up to computer screeen with CONVEX surface facing you (observer). It will be quite evident.

B

[eryn]

I agree, polarization axis is off. That specific complaint is a dead giveaway.

[dmitrijsg123]

Guys, thanx very much for your posts. you were dead right - the polarization in the left eye is off axis by around 30 degrees PLUS this lens is a bit overglazed. Case sorted. Thanx.