P3D Re: Pulfrich Effect

[Dave Combs <dcombs@xxxxxxxxxxxxxxxx>]

Paul Kline wrote:

>Last week I received my first pair of "lineless" bifocals.  After a 
>week I went back to have the fit adjusted and aligned for better
>far and medium vision - much better!  However, during that week I
>noticed a lot of Pulfrich effect while watching tv, so I assume that
>one lens was underperforming, making that eye work harder and giving
>the effect.
>
>It's gone now.
>
That's really interesting. Perhaps there are more factors than just the 
amount of light that impact the speed at which an image is presented to 
the brain. Maybe a change in focus such as would be caused by a change in 
perscription strength makes brain have to work harder to adjust until it 
has "learned" its new visual environment. Once it has adjusted, then the 
Pulfrich effect would disappear.

Dave Combs
Combs Music International
421 Cedar Trail
Winston-Salem, NC 27104 USA
E-mail: dave@xxxxxxxxxxxxxx
Internet Home Page: www.combsmusic.com
800-932-6627 (USA & Canada)
336-760-0037
336-760-3855 (fax)


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