Bob,
In my hoon days, I had a pair of yellow driving glasses. They did seem to
improve contrast and bring out detail in shadow.
They also looked pretty cool.
Carl Clifford
Sent from my iPad
On 22/07/2012, at 10:37, "Robert Inglis" <> wrote:
> Arwen, photochromic lenses (“Transitions” is a technology version registered
> by Transitions Optical) glasses are a good idea. They help to cut the glare
> while out in bright sunlight and adjust fairly quickly to moving into shade.
> The only real problem can be that they are not fully effective for driving as
> they don’t achieve their full darkness in the vehicle, however, it is
> possible to get ‘driving’ glasses with a basic tint and which are also
> photochromic in full sun. Transitions Optical claim their Transitions lenses
> also block 100% of UV rays but UV filter coatings can be added to any lens
> for a reasonable price. Glasses used in full sun should have the UV filter
> treatment as a matter of course.
> And birdwatchers who spend a lot of time in the sun should consider wearing
> UV filter treated sunglasses to protect their eyes. Extended exposure to UV
> light is a major cause of cataracts.
> There should be no real problem with reduced light through photochromic
> lenses while using binoculars as the area covered by the binos will revert to
> clear fairly quickly. It is quite fascinating to stand in full sun and hold
> your binoculars to your photochromic lenses for a short while and then check
> the circle of almost clear lens where the binos had been. Of course, there is
> a short ‘transition’ time so any one in the habit of only taking glances
> through their binoculars may be affected more by the momentary drop in light
> transmission through the binos. However, the pupil of the eye adjusts fairly
> quickly to variations in light levels.
>
> One thing I have wondered about is using yellow-tinted glasses such as some
> cricketers use. Apparently the yellow tint enhances ‘contrast” thus making
> some objects easier to see.
> Has any one had experience with yellow-tinted glasses?
>
> Bob Inglis
> Sandstone Point
> Qld
>
>
> From: Arwen B. Ximenes
> Sent: Sunday, July 22, 2012 7:40 AM
> To: ; ;
> ; ; ;
> ; ; ;
> ;
> Subject: RE: [Birding-Aus] birding and glasses (and contact lenses now)
>
> Hi again,
>
> sorry I haven't had a chance to reply since my last email, thanks for all the
> additional responses!!!
>
> well, I've been doing some research and I'm leaning towards trialling
> contacts (I also found the contact lenses thread) - mostly because of all the
> issues with glasses - I don't want to have to switch between normal glasses
> and sunnies, and I don't like the idea of having to look through the frames
> all the time, then there's the problem with rain/steam/spray, getting used to
> glasses+bins, etc.
>
> My research so far indicates the glasses lenses that would be most suitable
> for birding are the new (expensive) Japanese freeform lenses - these are
> multifocal but with a wider distance field as I understand it - perfect for
> birdwatching and also easier to get used to apparently. I thought it worth
> mentioning for those out there who said they wanted a wider field of view. I
> might need to wait for these, another reason to try contacts.
>
> I am interested in Judith's suggestion of putting one contact lense in the
> dominant eye - I didn't discuss this with the optometrist though as I was
> really thinking glasses at that stage, but will do so. Apparently you can
> also get multifocal contacts now - I'm not sure about those, or how they
> work.
>
> I do have a question - I thought it odd that the optometrist didn't think
> there was a problem using bins with sunglasses (i.e. prescription sunnies) -
> surely you need light to see through the bins? Both people I talked to in the
> shop, one being the optometrist, were convinced sunnies would hardly make any
> difference.
>
> My heartfelt thanks again to everyone who shared their experiences and ideas,
> there were many points I would not have thought of.
>
> I'll keep you posted.
>
> Arwen
>
>
>
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